Lago

At Lago, we're on a mission to make billing simpler, more transparent, and more adaptable for SaaS companies. As the leading open-source billing platform, we empower businesses to build flexible pricing models and scale with confidence. We've raised over $22 million in funding from top-tier investors including Y Combinator and FirstMark , reflecting strong confidence in our vision and growth. Our platform has garnered over 9,000 stars on GitHub , a testament to our active and growing developer community. Companies such as PayPal , CoreWeave , Synthesia and Mistral.ai choose Lago for their billing. We're a team of ambitious, focused individuals who work together to solve hard problems with excellence and accountability. At Lago, we value reliability and proactivity —we trust each other to own tasks, drive them to completion, and adapt quickly. While we encourage you to try fast and "fail fast" , we also expect you to learn fast : make mistakes, but don't make the same one twice. If you're excited by challenges and want to grow alongside a high-performing, supportive team, this is the place for you. Overview We're hiring an Engineering Squad Lead to take full ownership of one of the focused domains here at Lago: shipping features, keeping production healthy, and coordinating the team around you. This is a role that blends hands-on technical contribution with operational leadership. You'll stay close to the code while also being the person who keeps the squad moving: scoping work with Product, unblocking engineers, owning production incidents, and making sure the team is building with quality and velocity. You won't be handed a fully-formed system to maintain. Lago is a fast-moving product in a complex domain, billing infrastructure where precision and reliability genuinely matter. You'll need to make sound architectural decisions quickly, communicate trade-offs clearly, and hold a high bar without slowing the team down. What you'll be doing Technology Share technical authority with the Staff Engineer for your squad's domain: evaluate trade-offs together and drive architecture decisions Stay hands-on: code review, prototyping, contributing to critical paths Maintain code quality and review standards within the squad Own the code health of your domain Delivery Own the squad's roadmap execution for the quarter Run sprint planning, keep work moving, and unblock engineers day-to-day Ensure the squad is prepared for biweekly product demos and decide who presents Act as the primary engineering point of contact for Product: scope features, communicate trade-offs, and align on priorities Production Own production health for your squad's domain: monitor dashboards (Grafana, Sentry), respond to alerts, and resolve incidents Triage and resolve customer-reported issues within SLA targets, working in coordination with Customer Success Monitor and address CVEs and security vulnerabilities within your domain People Coordinate a squad of up to 10 engineers Run operational 1:1s, give day-to-day feedback, and flag performance signals to the Head of Engineering Coordinate the onboarding of new team members into the squad Process Define and adjust the squad's ways of working: balancing agility and discipline as the team and product evolve Drive engineering excellence: track DORA metrics, reduce cycle time, raise the quality bar Continuously improve how the squad works based on team feedback and results Who you are A credible technical leader who can collaborate closely with engineers because you're still in the work A clear communicator who can scope a feature with a PM, explain a production incident to a non-technical stakeholder, and give direct feedback to an engineer — all in the same week Operationally strong: you keep the trains running without needing a system to tell you what needs attention Someone who cares about team health as much as delivery — you notice when an engineer is stuck or di

About Lago At Lago, we're on a mission to make Monetization simpler for tech companies. As the leading open-source billing platform, we help businesses build flexible pricing models and scale with confidence. We've raised over $22 million in funding from top-tier investors including Y Combinator and FirstMark. Our platform has garnered around 10K stars on GitHub, a testament to our active and growing developer community. Companies such as PayPal, CoreWeave, Synthesia, and Mistral.ai choose Lago for their billing. And we have barely spent any money on Marketing or Ads so far. We're a team of ambitious, focused individuals who solve hard problems with excellence and accountability. At Lago, we value reliability and proactivity. We trust each other to own tasks, drive them to completion, and continuously improve them. While we encourage you to try fast and “fail fast”, we also expect you to learn fast: make mistakes, but don't make the same one twice. If you're excited by challenges and want to grow alongside a high-performing, supportive team, this is the place for you. The Role As an Enterprise Sales Consultant , you'll own the full commercial relationship with the companies that need Lago most: engineering-led, technically complex organisations navigating a fundamental change to how they bill their customers. This is not a role for someone who thrives on repetition. Every deal at Lago is different. You'll be navigating multi-stakeholder buying decisions that span engineering leads, product managers, CFOs, and C-suite — often simultaneously — while building genuine trust as a credible expert, not just a vendor. We're looking for someone who has spent years orchestrating complexity in a consulting environment and is now ready to own a commercial outcome. You understand how to map an organisation, align stakeholders, and bring structure to ambiguity. What you'll be building here is the instinct to close — and the satisfaction of owning a number. You'll be based in Paris, but still working closely with our CEO and GTM team in the USA, resulting in meaningful exposure to our US customer base. What You'll Be Doing Own the pipeline end-to-end : Qualify, progress, and close opportunities from initial contact through commercial negotiation and signed contract. You won't be cold calling or building the pipe, you will be expected to chase, follow up, and drive deals to a decision. Become a genuine product expert : Understand Lago's product architecture, open source positioning and pricing model well enough to hold a credible conversation with an engineering lead. You don't need to code, but you do need to care about the product deeply. Navigate complex buying environments : Map stakeholder landscapes across engineering, product, finance, and executive teams. Build the relationships and create the internal alignment that gets deals done. Complex sale requires strong project management skills. Run structured discovery : Go deep into a prospect's current billing infrastructure, understand their pain, and connect it clearly to what Lago solves. This is consultative selling — the quality of your diagnosis matters as much as your pitch. Lead demos and proof-of-concepts : Present Lago's value in a way that lands for both technical and business audiences. Adapt your approach to the room. Feed the feedback loop : Work closely with Product and Engineering to surface what you're hearing from prospects. At Lago's stage, what you learn in deals shapes what we build. Represent Lago externally : You'll be one of the faces of Lago for prospective customers. How you show up — prepared, sharp, curious — reflects directly on the company. Who You Are You've spent 5–10 years at an IT or digital transformation consultancy , working on complex implementation projects for large organisations — not pure strategy. You've built deliverables, managed client relationships, navigated internal politics, and produced work that had to be right. You've had commercial

About Lago At Lago, we're on a mission to make Monetization simpler for tech companies. As the leading open-source billing platform, we help businesses build flexible pricing models and scale with confidence. We've raised over $22 million in funding from top-tier investors including Y Combinator and FirstMark. Our platform has garnered around 10K stars on GitHub, a testament to our active and growing developer community. Companies such as PayPal, CoreWeave, Synthesia, and Mistral.ai choose Lago for their billing. And we have barely spent any money on Marketing or Ads so far. We're a team of ambitious, focused individuals who solve hard problems with excellence and accountability. At Lago, we value reliability and proactivity. We trust each other to own tasks, drive them to completion, and continuously improve them. While we encourage you to try fast and “fail fast”, we also expect you to learn fast: make mistakes, but don't make the same one twice. If you're excited by challenges and want to grow alongside a high-performing, supportive team, this is the place for you. Overview At Lago, Forward-Deployed Engineers (FDEs) are engineers embedded with customers. They build, integrate, and optimize Lago in production environments: ensuring adoption, scalability, and impact. This role blends engineering depth with delivery ownership and customer collaboration. You’ll write code, deploy systems, and translate real-world use cases into product-ready insights. FDEs are not part of the reactive support queue, and they’re not isolated in core product development. They sit at the intersection of engineering and delivery: the engineers who turn product flexibility into customer success. What you’ll be doing Own technical delivery for Tier 1 customers: from architecture design to deployment. Build custom integrations, connectors, and workflows using Lago’s Ruby on Rails APIs, React, and TypeScript stack. Design data ingestion pipelines and automation scripts (PostgreSQL, Redis, Kafka). Configure and optimize billing, metering, and event processing setups tailored to customer environments. Collaborate with Support Engineers on reliability handoffs and Core Engineering on product extensions. Write reusable code, documentation, and best-practice templates for future implementations. Surface recurring patterns or feature gaps to Product and Engineering for roadmap input. Mentor customer teams on Lago’s architecture, SDKs, and deployment patterns. Who you are A software engineer/technical expert who thrives in hands-on, customer-facing environments. Enjoys designing integrations, data pipelines, and technical architectures. Communicates clearly, balancing technical detail with customer empathy. Resourceful and comfortable navigating ambiguity. Eager to work across code, delivery, and customer experience. Who you’re not You’re not part of reactive support queues: you plan, build, and deliver. You’re not detached from customers: you embed and advise. You’re not limited to writing specs: you ship and document your work. You’re not chasing short-term fixes: you design systems that scale. Requirements 4+ years of experience working closely with APIs and SDKs (in Ruby/React would be a bonus but can be multiple languages) Deep understanding of REST APIs, authentication, and integration patterns. Strong SQL and data modeling skills (PostgreSQL, Redis, Kafka a plus). Experience designing and deploying production-ready integrations. Excellent written and verbal communication skills for both technical and non-technical stakeholders. Proven ability to manage delivery timelines and coordinate across teams. Nice to have Experience in technical consulting, professional services, or customer engineering. Familiarity with Terraform, Docker, or CI/CD environments. Background in billing, payments, or developer platforms. Prior contribution to open-source or customer-led product delivery. Growth path Technical: Senior → Core Engineering / Product Architec

About Lago At Lago, we're on a mission to make Monetization simpler for tech companies. As the leading open-source billing platform, we help businesses build flexible pricing models and scale with confidence. We've raised over $22 million in funding from top-tier investors including Y Combinator and FirstMark. Our platform has garnered around 10K stars on GitHub , a testament to our active and growing developer community. Companies such as PayPal , CoreWeave , Synthesia , and Mistral.ai choose Lago for their billing. And we have barely spent any money on Marketing or Ads so far. We're a team of ambitious, focused individuals who solve hard problems with excellence and accountability. At Lago, we value reliability and proactivity. We trust each other to own tasks, drive them to completion, and continuously improve them. While we encourage you to try fast and "fail fast" , we also expect you to learn fast : make mistakes, but don't make the same one twice. If you're excited by challenges and want to grow alongside a high-performing, supportive team, this is the place for you. Overview We are looking for a Growth Chief of Staff to take founder-defined priorities and turn them into shipped systems. Someone who can operate across GTM, ops, and growth without needing a playbook handed to them. This is not a fixed-scope role. Priorities shift. New problems emerge. What does not change is the expectation: you see what needs doing, own it, ship it, and turn it into a self-improving system. What You'll Be Doing Examples of projects: Build and own account outreach and nurturing motions from scratch Improve website conversion and CRM handoff processes Manage press, social, and brand projects around founder-led priorities Build dashboards, alerts, and operating cadences that keep the team moving, accountable, and improving Turn founder-led motions into campaigns, workflows, and repeatable playbooks Use AI tools and automation, while keeping humans in the loop when necessary Who You Are You take the owner seat. When a founder drops a half-formed idea, you do not wait for a follow-up. You turn it into a plan, identify what is missing, and own the outcome. You thrive on shifting priorities. This role will change shape as Lago grows. You're not looking for a rigid job spec. You're energized by being handed a new problem, figuring out the approach from scratch, and driving the impact. You communicate before you're asked. You share what you're working on, where things stand, and when something isn't working. Proactively, without needing a check-in to prompt you. You're curious and hands-on about technical and AI products. You don't need to be an engineer. But when you're evaluating a company, you read the docs, try the product, and build prototypes or workflows to understand it deeply. You understand what an API, a webhook, or an MCP is, or you can figure out a new technical concept quickly and explain why a customer would use it. That curiosity and builder-first mindset are non-negotiable. You're ruthless about what actually matters. You can look at five possible projects and correctly identify the one that moves the needle this week. You don't confuse activity with impact. Who You're Not Someone who arrives wanting to audit everything and start fresh. The priority is to double down on what already works. A strategist who produces decks. You produce shipped things. Someone focused on inputs. Outputs and impact are the north stars. Someone easily overwhelmed by things they have never done before or technical concepts. It has never been easier to learn new skills. Requirements 5+ years of experience in Growth Ops, GTM Ops, RevOps, BizOps, or a Founder's Office role with genuine GTM ownership Proven track record of building workflows, dashboards, and operating cadences, not just coordinating them Experience breaking down undefined problems: taking a business need and turning it into prioritized workstreams

About Lago At Lago, we're on a mission to make Monetization simpler for tech companies. As the leading open-source billing platform, we help businesses build flexible pricing models and scale with confidence. We've raised over $22 million in funding from top-tier investors including Y Combinator and FirstMark. Our platform has garnered around 10K stars on GitHub, a testament to our active and growing developer community. Companies such as PayPal, CoreWeave, Synthesia, and Mistral.ai choose Lago for their billing. And we have barely spent any money on Marketing or Ads so far. We're a team of ambitious, focused individuals who solve hard problems with excellence and accountability. At Lago, we value reliability and proactivity. We trust each other to own tasks, drive them to completion, and continuously improve them. While we encourage you to try fast and “fail fast”, we also expect you to learn fast: make mistakes, but don't make the same one twice. If you're excited by challenges and want to grow alongside a high-performing, supportive team, this is the place for you. What You’ll Do Own and scale Lago’s infrastructure to ensure reliability, performance, and security. Design and automate infrastructure provisioning using Pulumi, Kubernetes, and CI/CD pipelines. Optimize databases (PostgreSQL, Clickhouse) for high availability and performance. Improve monitoring and observability , ensuring proactive detection and resolution of issues. Enhance security practices , from IAM policies to data protection strategies. Collaborate with engineers to improve deployment processes and DevOps best practices. What We’re Looking For Strong experience in infrastructure engineering , DevOps, or SRE roles: 5 year+ Expertise in Kubernetes, Pulumi, and cloud environments (AWS/GCP). Experience managing and scaling PostgreSQL in production. Proficiency in Ruby, Go or Typescript (or willingness to learn). Passion for open-source and infrastructure-as-code principles. Ability to work autonomously in a fast-moving startup environment. AI Forward Engineers that are comfortable leveraging modern technology to improve their impact. Bonus Points ✅ Experience with open-source projects or developer tools. ✅ Strong background in security and compliance for cloud applications. ✅ Prior experience in metering, billing, or fintech infrastructure. Location type: Remote Canada Team : Engineering Work Type: Full Time/Permanent Contract Salary: 80,000-120,000 USD per year (Can be flexible for the right candidate) (Applicants must be based in the location specified for this role. Applications from other locations will not be considered.)

About Lago At Lago, we're on a mission to make Monetization simpler for tech companies. As the leading open-source billing platform, we help businesses build flexible pricing models and scale with confidence. We've raised over $22 million in funding from top-tier investors including Y Combinator and FirstMark. Our platform has garnered around 10K stars on GitHub, a testament to our active and growing developer community. Companies such as PayPal, CoreWeave, Synthesia, and Mistral.ai choose Lago for their billing. And we have barely spent any money on Marketing or Ads so far. We're a team of ambitious, focused individuals who solve hard problems with excellence and accountability. At Lago, we value reliability and proactivity. We trust each other to own tasks, drive them to completion, and continuously improve them. While we encourage you to try fast and “fail fast”, we also expect you to learn fast: make mistakes, but don't make the same one twice. If you're excited by challenges and want to grow alongside a high-performing, supportive team, this is the place for you. What You’ll Do Own and scale Lago’s infrastructure to ensure reliability, performance, and security. Design and automate infrastructure provisioning using Pulumi, Kubernetes, and CI/CD pipelines. Optimize databases (PostgreSQL, Clickhouse) for high availability and performance. Improve monitoring and observability , ensuring proactive detection and resolution of issues. Enhance security practices , from IAM policies to data protection strategies. Collaborate with engineers to improve deployment processes and DevOps best practices. What We’re Looking For Strong experience in infrastructure engineering , DevOps, or SRE roles: 5 year+ Expertise in Kubernetes, Pulumi, and cloud environments (AWS/GCP). Experience managing and scaling PostgreSQL in production. Passion for open-source and infrastructure-as-code principles. Ability to work autonomously in a fast-moving startup environment. AI Forward Engineers that are comfortable leveraging modern technology to improve their impact. Bonus Points ✅ Experience with open-source projects or developer tools. ✅ Strong background in security and compliance for cloud applications. ✅ Prior experience in metering, billing, or fintech infrastructure. ✅ Proficiency in Ruby, Go or Typescript (or willingness to learn). Why Join Lago? 🔥 Impactful role: Build infrastructure for a fast-growing open-source company. 💡 Technical challenges: Solve complex scalability and reliability problems. 🌍 Remote-friendly: Work from anywhere in Europe Location type: Remote Europe Team : Engineering Work Type: Full Time/Permanent Contract Salary: 70,000-110,000 EUR per year (Applicants must be based in the location specified for this role. Applications from other locations will not be considered.)

About Lago At Lago, we're on a mission to make Monetization simpler for tech companies. As the leading open-source billing platform, we help businesses build flexible pricing models and scale with confidence. We've raised over $22 million in funding from top-tier investors including Y Combinator and FirstMark. Our platform has garnered around 10K stars on GitHub, a testament to our active and growing developer community. Companies such as PayPal, CoreWeave, Synthesia, and Mistral.ai choose Lago for their billing. And we have barely spent any money on Marketing or Ads so far. We're a team of ambitious, focused individuals who solve hard problems with excellence and accountability. At Lago, we value reliability and proactivity. We trust each other to own tasks, drive them to completion, and continuously improve them. While we encourage you to try fast and “fail fast”, we also expect you to learn fast: make mistakes, but don't make the same one twice. If you're excited by challenges and want to grow alongside a high-performing, supportive team, this is the place for you. What you'll do Own product design end-to-end, from problem framing to shipped product. Design complex B2B workflows across billing, pricing, metering, invoicing, subscriptions, wallets, and analytics. Turn messy, technical, and ambiguous problems into clear, intuitive product experiences. Prototype quickly to test ideas, clarify direction, and accelerate decision-making. Partner closely with engineers during implementation to make sure design quality survives shipping. Who you are You ship fast and stay in motion: you'd rather get something in front of users this week than perfect it for a month. You elevate craft while moving fast: pixels, copy, empty states, edge cases, and interaction details matter to you. You're AI-native in how you work: you use AI tools to extend what you can design, prototype, write, research, and build. You stay close to the market: you design for where product and AI capabilities are heading, not only what Lago can do today. You communicate clearly: you align people, challenge assumptions constructively, and create clarity when things are ambiguous. Requirements 5+ years of experience designing and shipping high-quality digital products, ideally in B2B SaaS, developer tools, fintech, infrastructure, or complex workflow products. A strong portfolio showing end-to-end product thinking: problem framing, UX exploration, visual design, interaction details, and shipped outcomes. Exceptional visual and interaction design skills across typography, layout, information hierarchy, states, microcopy, and accessibility. Ability to prototype quickly in Figma, code, AI-assisted tools, or other environments to explore ideas and accelerate decisions. Strong communication skills in English, both written and spoken, with the ability to align people, explain trade-offs, and defend a design direction clearly. Why Join Lago? 🔥 Impactful role: Take the lead on various complex technical projects in a fast-growing open-source company. 🙏 Work with the best: We pride ourselves on hiring top tier technical and business talent, this is a chance to collaborate daily with both. 💸 Shape the future of fintech : Be part of a fast-growing company building the best open-source billing platform. Ready to Work with Us? If you’re excited about joining a high-talent team to solve meaningful problems and help businesses thrive, we’d love to hear from you. Apply today and let’s build something remarkable—together. Location type: Hybrid Primary Location: Paris office Secondary Location: Remote Europe Team : Product Work Type: Full Time/Permanent Contract Salary: 70,000-100,000 EUR per year (Applicants must be based in the location specified for this role. Applications from other locations will not be considered.)

About Lago At Lago, we're on a mission to make Monetization simpler for tech companies. As the leading open-source billing platform, we help businesses build flexible pricing models and scale with confidence. We've raised over $22 million in funding from top-tier investors including Y Combinator and FirstMark. Our platform has garnered around 10K stars on GitHub, a testament to our active and growing developer community. Companies such as PayPal, CoreWeave, Synthesia, and Mistral.ai choose Lago for their billing. And we have barely spent any money on Marketing or Ads so far. We're a team of ambitious, focused individuals who solve hard problems with excellence and accountability. At Lago, we value reliability and proactivity. We trust each other to own tasks, drive them to completion, and continuously improve them. While we encourage you to try fast and “fail fast”, we also expect you to learn fast: make mistakes, but don't make the same one twice. If you're excited by challenges and want to grow alongside a high-performing, supportive team, this is the place for you. Overview We're looking for a Senior Product Engineer to help drive Lago's core product forward — someone who obsesses over what gets built and why. You'll work at the intersection of engineering, product and design, owning features end-to-end: from shaping requirements with customers to shipping and iterating in production. This is a high-ownership role for someone who doesn't want to wait for a spec — they want to write it, then build it. What you'll be doing Own product features end-to-end, from discovery and scoping to implementation, release, and iteration in production. Work directly with customers and internal teams to understand pain points, clarify requirements, and identify the highest-impact problems to solve. Contribute actively to product decisions, not just technical execution. Build clean, reliable, and maintainable solutions with a strong sense of quality, usability, and customer impact. Collaborate closely with engineering, product, design, and GTM teams to align on priorities and deliver high-quality outcomes. Use AI thoughtfully to move faster, explore solutions, prototype ideas, and improve your own engineering workflow. Engage with our developer community by contributing to the open-source repository, responding to GitHub issues, and representing Lago's engineering standards publicly. Who you are You're comfortable working in ambiguous, fast-moving environments. You create clarity instead of waiting for it. You care about what gets built and why, not only how it gets implemented. You have strong product instincts and naturally think about user experience, business impact, customer needs, and technical trade-offs. You communicate clearly in writing and in conversation. You know how to align people in a room, challenge assumptions constructively, and question your own assumptions when needed. You know how to build with and without AI. You can use AI tools to move faster, but you also understand the fundamentals deeply enough to reason, debug, and make decisions independently. You value ownership. When you take on a problem, you drive it to completion. You're pragmatic. You know when to move fast, when to go deep, and when to keep things simple. Requirements 5+ years of software engineering or product engineering experience, with a track record of shipping products users love — not just systems that work. Strong product and design instincts: you think about UX, business impact, customer needs, and technical correctness together. Experience building B2B SaaS products, ideally developer tools, APIs, infrastructure, billing, fintech, or usage-based platforms. Strong AI skills: you know how to use AI tools effectively to build, prototype, debug, and accelerate your work — while still being able to build and reason without relying on them. Strong communication skills, both written and spoken. You can align people around a decision, explain trade-

About Lago At Lago, we're on a mission to make Monetization simpler for tech companies. As the leading open-source billing platform, we help businesses build flexible pricing models and scale with confidence. We've raised over $22 million in funding from top-tier investors including Y Combinator and FirstMark. Our platform has garnered around 10K stars on GitHub, a testament to our active and growing developer community. Companies such as PayPal, CoreWeave, Synthesia, and Mistral.ai choose Lago for their billing. And we have barely spent any money on Marketing or Ads so far. We're a team of ambitious, focused individuals who solve hard problems with excellence and accountability. At Lago, we value reliability and proactivity. We trust each other to own tasks, drive them to completion, and continuously improve them. While we encourage you to try fast and “fail fast”, we also expect you to learn fast: make mistakes, but don't make the same one twice. If you're excited by challenges and want to grow alongside a high-performing, supportive team, this is the place for you. Overview We're looking for a Senior Backend Ruby Engineer to contribute to Lago's core product and help scale our open-source billing infrastructure. You'll work across the full backend stack, collaborate closely with Product and Frontend, and help shape how we build and evolve the platform. What You'll Be Doing Contribute daily to all parts of our codebase, using our development workflow Tackle a wide variety of technical problems throughout the stack Help grow the back-end team Work with our Product Team and Front-end Engineers to understand customer needs and challenges Come up with technical solutions to create and improve our best features and architecture Who You Are Strong knowledge of Ruby (at least 6 years hands-on experience) Experience working with large volumes of data and event-driven environments A genuine passion for Open-Source: if you've contributed to OSS projects or used OSS tools, let us know! A real appetite for the early stages of co-creating a product and shaping Lago's future Bonus: you've worked on billing or tax projects — whether implementing a billing system, maintaining it, or integrating it with business tools (e.g. a CRM, Finance tools) Who You're Not You're not looking for a "just ship it" culture without quality standards — we care deeply about both speed and craftsmanship You're not someone who works in silos — you actively collaborate with Product, Frontend, and your fellow engineers You're not intimidated by ambiguity — early-stage problems don't always come with a clear spec, and you're comfortable navigating that You're not allergic to context-switching — in a lean team, priorities shift and you adapt without losing momentum Requirements 6+ years of hands-on experience in software engineering, with strong Ruby expertise Experience working with event-driven systems and high-data-volume environments Familiarity with background job frameworks (e.g. Sidekiq) and message queues Comfort with REST APIs, webhooks, and data integrations Strong written and verbal communication skills A mindset of ownership, curiosity, and resilience Nice to have Experience contributing to or supporting open-source projects Familiarity with billing systems, fintech, or developer tools Experience with PostgreSQL, Redis, Kafka, or similar infrastructure Exposure to containerised environments (Docker, AWS, CI/CD) Why Join Lago? Work with top-tier talent : Join a team that values excellence, ambition, and accountability Shape the future of fintech : Be part of a fast-growing company building the best open-source billing platform Competitive package : Competitive salary and equity for employees based in France Make an impact : Your work directly shapes the product used by companies like PayPal, Synthesia, and Mistral.ai Ready to Build with Us? If you're excited about joining a high-talent team to solve meaningful problems and help businesses thri

About Lago At Lago, we're on a mission to make Monetization simpler for tech companies. As the leading open-source billing platform, we help businesses build flexible pricing models and scale with confidence. We've raised over $22 million in funding from top-tier investors including Y Combinator and FirstMark. Our platform has garnered around 10K stars on GitHub, a testament to our active and growing developer community. Companies such as PayPal, CoreWeave, Synthesia, and Mistral.ai choose Lago for their billing. And we have barely spent any money on Marketing or Ads so far. We're a team of ambitious, focused individuals who solve hard problems with excellence and accountability. At Lago, we value reliability and proactivity. We trust each other to own tasks, drive them to completion, and continuously improve them. While we encourage you to try fast and “fail fast”, we also expect you to learn fast: make mistakes, but don't make the same one twice. If you're excited by challenges and want to grow alongside a high-performing, supportive team, this is the place for you. Overview We're looking for a Senior Backend Ruby Engineer to contribute to Lago's core product and help scale our open-source billing infrastructure. You'll work across the full backend stack, collaborate closely with Product and Frontend, and help shape how we build and evolve the platform. What You'll Be Doing Contribute daily to all parts of our codebase, using our development workflow Tackle a wide variety of technical problems throughout the stack Help grow the back-end team Work with our Product Team and Front-end Engineers to understand customer needs and challenges Come up with technical solutions to create and improve our best features and architecture Who You Are Strong knowledge of Ruby (at least 6 years hands-on experience) Experience working with large volumes of data and event-driven environments A genuine passion for Open-Source: if you've contributed to OSS projects or used OSS tools, let us know! A real appetite for the early stages of co-creating a product and shaping Lago's future Bonus: you've worked on billing or tax projects — whether implementing a billing system, maintaining it, or integrating it with business tools (e.g. a CRM, Finance tools) Who You're Not You're not looking for a "just ship it" culture without quality standards — we care deeply about both speed and craftsmanship You're not someone who works in silos — you actively collaborate with Product, Frontend, and your fellow engineers You're not intimidated by ambiguity — early-stage problems don't always come with a clear spec, and you're comfortable navigating that You're not allergic to context-switching — in a lean team, priorities shift and you adapt without losing momentum Requirements 6+ years of hands-on experience in software engineering, with strong Ruby expertise Experience working with event-driven systems and high-data-volume environments Familiarity with background job frameworks (e.g. Sidekiq) and message queues Comfort with REST APIs, webhooks, and data integrations Strong written and verbal communication skills A mindset of ownership, curiosity, and resilience Nice to have Experience contributing to or supporting open-source projects Familiarity with billing systems, fintech, or developer tools Experience with PostgreSQL, Redis, Kafka, or similar infrastructure Exposure to containerised environments (Docker, AWS, CI/CD) Why Join Lago? Work with top-tier talent : Join a team that values excellence, ambition, and accountability Shape the future of fintech : Be part of a fast-growing company building the best open-source billing platform Remote-friendly : Work from anywhere in Europe (within +2h/-2h of CET), or join us in our Paris office Competitive package : Competitive salary and equity for employees based in France Make an impact : Your work directly shapes the product used by companies like PayPal, Synthesia, and Mistral.ai Ready to Build with Us? I

About Lago At Lago, we're on a mission to make Monetization simpler for tech companies. As the leading open-source billing platform, we help businesses build flexible pricing models and scale with confidence. We've raised over $22 million in funding from top-tier investors including Y Combinator and FirstMark. Our platform has garnered around 10K stars on GitHub, a testament to our active and growing developer community. Companies such as PayPal, CoreWeave, Synthesia, and Mistral.ai choose Lago for their billing. And we have barely spent any money on Marketing or Ads so far. We're a team of ambitious, focused individuals who solve hard problems with excellence and accountability. At Lago, we value reliability and proactivity. We trust each other to own tasks, drive them to completion, and continuously improve them. While we encourage you to try fast and “fail fast”, we also expect you to learn fast: make mistakes, but don't make the same one twice. If you're excited by challenges and want to grow alongside a high-performing, supportive team, this is the place for you. Overview We're looking for a Senior Frontend Engineer to own and scale Lago's frontend application. You'll work closely with our Product and Backend Engineering teams to build and ship high-quality features, maintain our design system, and ensure the frontend is reliable, performant, and consistent at scale. What You'll Be Doing Own and scale Lago's frontend app — reliability, performance, and feature delivery Co-design and build features with the Product and Backend Engineering teams Maintain and enhance our design system to ensure consistency across the app Improve monitoring and observability for frontend issues and bugs Work autonomously in a fast-moving environment and lead your topics to completion Who You Are 5+ years of experience in frontend development Expert-level React skills Experience managing and scaling design systems in production Comfortable working autonomously in a fast-paced startup environment Proactive and ownership-driven — you lead your topics to completion without needing to be chased A genuine interest in open-source or developer tools is a strong plus Who You're Not You're not someone who needs a fully scoped spec to start moving — you're comfortable with ambiguity and make progress anyway You're not siloed — you collaborate actively with Product, Backend, and Design and communicate clearly across teams You're not satisfied with "it works" — you care about performance, observability, and long-term maintainability You're not just a feature builder — you take pride in the systems and patterns that make the whole frontend better Requirements 5+ years of professional frontend engineering experience Strong expertise in React Experience building and maintaining design systems in production environments Solid understanding of frontend performance, monitoring, and observability Strong written and verbal communication skills A mindset of ownership, curiosity, and continuous improvement Nice to have Proficiency in GraphQL Experience contributing to or supporting open-source projects Familiarity with developer tools or infrastructure products Exposure to billing, fintech, or data-intensive frontend applications Why Join Lago? Work with top-tier talent : Join a team that values excellence, ambition, and accountability Shape the future of fintech : Be part of a fast-growing company building the best open-source billing platform Remote-friendly : Work from anywhere in Europe Competitive package : Competitive salary and stock options Make an impact : Own the entire frontend of a product used by companies like PayPal, Synthesia, and Mistral.ai Ready to Build with Us? If you're excited about joining a high-talent team to solve meaningful problems and help businesses thrive, we'd love to hear from you. Apply today and let's build something remarkable—together. Location type: Remote Primary Location: Remote Europe Team: Product Engineering Wo

At Lago, we're on a mission to make billing simpler, more transparent, and more adaptable for SaaS companies. As the leading open-source billing platform, we empower businesses to build flexible pricing models and scale with confidence. We've raised over $22 million in funding from top-tier investors including Y Combinator and FirstMark , reflecting strong confidence in our vision and growth. Our platform has garnered over 9,000 stars on GitHub , a testament to our active and growing developer community. Companies such as PayPal , CoreWeave , Synthesia and Mistral.ai choose Lago for their billing. We're a team of ambitious, focused individuals who work together to solve hard problems with excellence and accountability. At Lago, we value reliability and proactivity —we trust each other to own tasks, drive them to completion, and adapt quickly. While we encourage you to try fast and "fail fast" , we also expect you to learn fast : make mistakes, but don't make the same one twice. If you're excited by challenges and want to grow alongside a high-performing, supportive team, this is the place for you. Overview We're hiring a Solutions Engineer in Europe to be the technical backbone of our GTM motion — from first demo to successful go-live and beyond. This is a dual-focus role: pre-sales first , where you help prospects evaluate and understand Lago deeply, and post-sales second , where you ensure the customers who sign with us get to production and see value. You will work directly with our AE team, co-founders, and product to shape deals and guide implementations. This isn't a classic SE role where you polish the same demo script for every prospect. Every billing architecture is different, every contract is custom, and every customer has gaps you'll need to bridge creatively. You'll need to go deep — technically and commercially — to help prospects understand what's possible in Lago and translate that into real, working configurations. You'll be joining a small, high-ownership team and working alongside people who already set the standard for what great looks like in this function at Lago. What you'll be doing Pre-sales (primary focus) Run technical discovery calls to understand prospects' pricing models, billing infrastructure, and integration requirements Lead and own product demos — building bespoke demo environments tailored to each prospect's use cases, not off-the-shelf scripts Manage technical evaluations and cloud trials end-to-end: configure demo data, set up trial environments, run technical workshops, and stay close to the prospect throughout Write clear, honest deal debriefs that capture what landed, what's at risk, and what actions are needed — shared with the AE and founder team Surface and work through product gaps creatively: propose API-level workarounds, validate feasibility with engineering, and frame limitations transparently without losing deals Produce competitive technical analysis and maintain battle cards as Lago's market position evolves Partner with AEs on commercial strategy: know when to push for a close, when to escalate to a founder, and how to sequence the conversation Post-sales (secondary focus) Lead onboarding for new customers — both their engineering teams (API integration, event schema, webhooks) and their finance and ops teams (plan configuration, invoice flows, reporting) Serve as the primary technical point of contact through the implementation phase, owning the customer relationship until they go live Conduct proactive check-ins and syncs throughout implementation to unblock customers and prevent issues before they escalate Identify expansion and optimisation opportunities within existing accounts as usage matures Partner with Customer Success and Support to ensure a clean handoff after go-live Feed recurring implementation pain points back to Product and Engineering to inform roadmap prioritisation Who you are A strong technical generalist who can read API

About Lago At Lago, we're on a mission to make Monetization simpler for tech companies. As the leading open-source billing platform, we help businesses build flexible pricing models and scale with confidence. We've raised over $22 million in funding from top-tier investors including Y Combinator and FirstMark. Our platform has garnered around 10K stars on GitHub, a testament to our active and growing developer community. Companies such as PayPal, CoreWeave, Synthesia, and Mistral.ai choose Lago for their billing. And we have barely spent any money on Marketing or Ads so far. We're a team of ambitious, focused individuals who solve hard problems with excellence and accountability. At Lago, we value reliability and proactivity. We trust each other to own tasks, drive them to completion, and continuously improve them. While we encourage you to try fast and “fail fast”, we also expect you to learn fast: make mistakes, but don't make the same one twice. If you're excited by challenges and want to grow alongside a high-performing, supportive team, this is the place for you. The Role As a Technical Account Executive , you’ll play a crucial role in connecting our platform to our customers’ needs. You don’t need an engineering degree or years of coding experience, but you do need curiosity, the ability to learn quickly, and a drive to become an expert in Lago’s product. You’ll guide customers through their journey—from the first contact to onboarding—helping them unlock the full potential of our platform. Your role will involve simplifying technical concepts, solving problems creatively, and championing Lago’s open-source ethos. What You’ll Be Doing Become a product expert : Dive into our documentation, learn how Lago works, and use that knowledge to help customers succeed. Help customers win : Lead demos, guide proof-of-concepts, and ensure customers see the value of Lago. Simplify technical concepts : Break down APIs, integrations, and billing workflows into clear, actionable steps for customers. Own and drive your tasks : Take full responsibility for your work, from start to finish, ensuring a smooth experience for customers. Collaborate with excellence : Work closely with our engineering, product, and marketing teams to ensure a seamless customer experience. Represent open source : Show customers why Lago’s open-source approach gives them control, transparency, and a better way to scale their business. Who You Are Eager to learn : You don’t need to be a technical expert on day one, but you’re excited to pick up new skills and dive into our product. A clear communicator : You can explain complex ideas in simple, relatable ways for both technical and non-technical audiences. Ambitious and accountable : You aim for excellence while owning your work and driving it to completion. Reliable and proactive : You take initiative, solve problems creatively, and thrive in a dynamic environment. You won't expect to bring other people in each meeting (unless absolutely necessary) and take great pride in being able to say things such as "I got it, I've anticipated it and here's what I've already prepped". Driven by impact : You’re motivated by meaningful work and love seeing how your efforts help customers and the team succeed. What We Value Talent density : We prioritize hiring exceptional people who raise the bar for everyone around them. Velocity of execution : We move fast and value individuals who can make things happen without sacrificing quality. Learn fast : We encourage you to fail fast but expect you to learn fast—embracing mistakes as part of growth but ensuring they aren’t repeated. Doing what you say (you’ll do) and telling what you do: Accountability and proactive communication are key to succeeding in our geographically distributed, flexible processes. Open-source ethos : Transparency and collaboration aren’t just values; they’re how we operate. Who You’re Not Afraid of learning technical concepts : You don’t need to code, b