(Senior) AI/LLM Engineer

Über diese Stelle

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 an AI/LLM Engineer, you will play a key role in building agentic AI systems end-to-end. This is a fast-paced, hands-on role for engineers with high agency, strong technical depth and founder mindset. You’ll work on building reliable AI systems in production - from retrieval and LLM orchestration to tool-using agents and product integration.

If you’re a passionate builder who excels at the intersection of LLMs, data systems, AI, data engineering, and full-stack development, this is your opportunity to shape how users interact with AI in real-world workflows.

WHAT YOU WILL BE WORKING ON

- Agentic Systems: Design and build LLM-powered agentic systems end-to-end, from experimentation to production deployment

- Retrieval & Context: Build retrieval and context pipelines (RAG, hybrid search, structured retrieval) to enable reliable reasoning over large volumes of technical and commercial data

- AI Evals: Develop evaluation and monitoring systems to measure and improve AI performance in production

- Data Pipelines: Build scalable pipelines to process and structure large volumes of unstructured documents and data

- Feedback Loops: Implement automated feedback pipelines that allow AI systems to learn from usage data and human feedback

- AI Infra: Own the architecture and reliability of AI systems in production, ensuring they are fast, scalable, and robust

- Product Integration: Collaborate with other stellar engineers to deeply integrate AI capabilities into the product experience

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 and caring team that 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 https://en.werk1.com/coliving-apartments-munich/, 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:

- Proven track record of architecting and building complex, AI/LLM-powered systems or agents in production, including model serving, orchestration of agent workflows, monitoring, and scaling AI workloads

- Designing systems that process and structure large volumes of unstructured data

- Developing evaluation and feedback loops to measure and improve AI system performance

- Experience with Python is required

- Experience in full-stack development (React / Typescript / FastAPI) is a plus

Mindset & Commitment:

- High agency & ownership: You develop new ideas and drive them in execution under minimal guidance

- Mission-driven: Your job is part of how you define yourself. You are fully committed to your work and achieving ambitious goals amid uncertainty.

- Product mindset: You demonstrate product thinking on a deep level and solve problems end-to-end

- You’re excited to iterate quickly and build software in a fast-paced startup environment

- You want to work in-person in Munich with a higher intensity than in a 9-5 job

YOUR TEAM & MENTORS

You will work with

- Sean https://www.linkedin.com/in/sean-sdahl/ (Co-Founder & CTO; Silver Medallist at the International Physics Olympiad (IPhO))

- Kolya https://www.linkedin.com/in/kolya-krafeld/ (prev. SWE at SF-based startup Etleap)

- Gabriel https://www.linkedin.com/in/gabriel-hauss/ (built Maastricht University's course selection system; Oxford graduate)

- Admir https://www.linkedin.com/in/azatega/ (Bronze Medallist at the International Olympiad in Informatics (IOI))

- Nico https://www.linkedin.com/in/nico-stabla/ (prev. Engineering at SaaS startups Luminovo & Fides)

Your mentors will be

- Rohan Ramanath https://www.linkedin.com/in/rohanramanath/ (General Manager AI Product at Nubank, prev. co-founder Hyperplane)

- Daniel Ribeiro Silva https://www.linkedin.com/in/danielribeirosilva/ (Senior Director of ML at Nubank, prev. co-founder Hyperplane)

WHY MERCURA

- Join an ambitious and caring team: Your future colleagues are experienced operators, ex-founders, Science Olympiad medallists, and top graduates from places such as Google, Bain, MIT, TUM, Harvard, CDTM, and Cambridge. We bring extraordinary people together and deeply invest in your growth as your mentors, teammates and friends. We care, trust, and support one another, and we make sure that fun is at the heart of everything we do.

- Work with the latest tech: AI is at the core of our product, and use the latest tech across our product and processes to tackle meaningful challenges and shape how users interact with AI.

- Thrive in a high-growth, high-commitment environment: We’re growing extremely fast because we always put our work and our customers first. If you excel in fast-paced settings and want to grow as part of something big from day one, Mercura is for you.

- 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…