(Senior) Fullstack Engineer

About the role

Mercura ( YC W25 ) helps the companies that build the real world move at software speed, automating the back-office work that runs the $12 trillion industry behind every hospital, school, and power plant. We started with one of their biggest bottlenecks - turning messy technical requests into accurate quotes - and grew to $2M ARR in our first year. With a team of 16, we're now targeting $10M by the end of 2026 as well as our expansion into the US.

About the role

As a Full-Stack Engineer , you will play a key role in building AI systems end-to-end. This is a fast-paced, hands-on role for engineers with high agency , strong technical depth and founder mindset. We’re looking for experienced builders with a strong product mindset and a track record of shipping complex web applications.

If you are a builder who thrives at the intersection of full-stack development and AI - this is your opportunity to working alongside a team of stellar engineers and shape how users interact with AI.

What you will be working on

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Core Engineering : Design and build high-performance, reliable systems that power Mercura’s AI products and ensure scalability.

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End-to-End Ownership : Own features end-to-end from architecture and implementation to deployment, monitoring, and iteration.

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Backend & APIs : Develop scalable APIs and backend systems that support evolving AI capabilities and product growth.

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Product Engineering : Work closely with users and the product team to translate real-world workflows into clear product and engineering decisions.

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Rapid Iteration : Ship improvements quickly through fast iteration cycles and pragmatic engineering decisions.

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AI Integration : Contribute to LLM engineering and AI systems, collaborating with the team on how models are integrated into the product.

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Technical Architecture : Help shape the overall system architecture, deployment strategy, and engineering tooling across the stack.

What we offer:

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Steepest possible learning curve: There's no faster way to grow than building a company from scratch. You'll be thrown into the cold water, do things no one has done before, and have founder-like freedom in your domain. Over five Mercura alumni have gone on to found their own companies and raise millions after their time with us.

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Build something with real-world impact : We ship code that directly helps a massive, yet overlooked manual industry run more efficiently and sustainably. With us, you can work on AI that contributes to economic growth and stability on a huge scale.

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Ownership over comfort: You own a real area end to end. No one stands between you and your problem. It's uncomfortable at times, and that's exactly why you'll grow faster here than in any normal job.