Founding Staff Engineer

About Mercura

Mercura is building AI software for the backbone of our economy.

Backed by Y Combinator, we raised a heavily oversubscribed round at one of the highest valuations in our cohort. As one of Europe's fastest growing startups, we surpassed $2M in ARR in in our first year. Now, we are looking for team members ready to go all-in to help us reach our next milestone: $10M ARR by the end of 2026.

One of our co-founders, Lukas, grew up in a trades family that has been active in the construction industry for over 115 years. Having worked on the construction site himself, he learned first-hand how slow and manual quoting still is in the industry.

In an era where AI becomes ubiquitous, we set out on a deeply personal mission: bring AI to the backbone of our economy - to the companies that keep our world running. To amplify human expertise and free people to do what only humans can do.

About the role

As a Founding Staff Engineer , you will be the technical backbone of Mercura's engineering team - spanning multiple products and development streams. This is a deeply hands-on role for engineers who lead by doing: writing production code, solving the hardest architectural problems, and making the people around them meaningfully better.

We're looking for a highly technical engineers who want to ship core systems, strengthen architecture across products, and leave every codebase they touch in better shape than they found it. If you want outsized technical ownership without moving into management, this is your role.

What you will be working on

Technical Leadership in Code: Own the most complex and highest-leverage engineering work across Mercura's product suite - building core systems, shared frameworks, and critical infrastructure that other engineers build on top of.

Cross-Product Architecture: Define and evolve architecture decisions across multiple products. You'll make the calls that prevent architectural dead-ends two years from now.

Hands-On Execution: Spend the majority of your time writing and shipping code. You lead by example - when something is hard, you're in the trenches.

Engineering Quality: Eliminate technical debt by refactoring abstractions and raising reliability, standards across all teams.

Technical Mentorship: Elevate the engineers around you through code review, pairing, and direct feedback. Help teams deliver consistently without burning out or accumulating hidden risk.

AI Systems: Contribute to the architecture and implementation of Mercura's AI capabilities - from LLM pipelines to data infrastructure - at the intersection of performance and product quality.

What we offer

Learn to build a company : Over five Mercura alumni have gone on to found their own companies and raise millions after their time with us. At Mercura, you’ll take on real responsibility and gain the hands-on experience only possible in a high-growth startup.

Guaranteed career advancement opportunities in a rapidly growing team

An ambitious team that feels like family and sees their work as more than just a job

Real shares in our company with the most favorable tax treatment - no VSOP/ESOP

Free team dinner (up to 4x/week)

UrbanSportsClub membership and access to a company bike - join our team workouts 3x/week

Easy relocation to Munich - our office is located in the Werk1 Startup Incubator, where you can rent a 1-bedroom apartment right next to the office for just €800/month

Access to any AI or productivity tools you need

What we're looking for

Technical Skills & Experience

8+ years of software engineering experience, with a track record of solving genuinely hard technical problems in production

Deep expertise across the stack - strong in backend systems, APIs, and infrastructure, comfortable in frontend when needed (Python, React, TypeScript)

Proven experience designing and evolving systems across multiple products and teams

Experience improving system performance, reliability, and scalability at scale