Solutions Engineer

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