(Senior) AI/LLM Engineer

Job description

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 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. Build something with real-world impact : We ship code that directly helps a massive, yet ov…