Senior AI Engineer - @Cori

Senior AI Engineer - @Cori Join us Cori Clinical is the operating system behind better clinical trials. Cori builds the best-in-class AI platform for the entire trial startup: research, design, authoring, review, and amendments, so the science never waits on the process. Founded in 2025 by Jorn Jansen Schoonhoven (CEO, ex-Amazon, ex-IBM) and Patricio Fernández Weisson (CTO, ex-AstraZeneca, ex-Sanofi), and backed by leading investors. Why join: Help redefine how clinical trials are run using AI, in one of the most important industries in the world, Work alongside a small team of exceptional engineers, operators, and clinical experts solving genuinely hard problems, High freedom for research and testing, with lots of green fields for your ideas, Build systems that don't just automate workflows, they accelerate getting new treatments to patients faster, Work directly with leadership and founders. Values High agency, Curiosity, Creativity, Accountability, Transparency. Mission highlights We are building an AI-guided system that accelerates clinical trials to speeds never seen before. So any organization, large or small, can get medicine to patients faster. Reporting Line Patricio, Co-Founder & CTO. First 3 months Ship to production one agentic workflow live with real users, taking a multi-step trial process from chat to completed output, Define what "good" means for our AI systems and hold releases to it: accuracy, latency, cost, and failure modes, backed by an eval framework you designed, Own the AI architecture decisions: agent framework, evals, model and fine-tuning strategy, build vs buy. You set the direction. By month 6 Cori's AI roadmap is yours to shape alongside the founders, At least 2 additional workflows have been built and deployed to production, Cori's AI strategy (agents, harness, fine-tuning) is defined and the first pieces are in production. Responsibilities Own AI-related technical decisions across the company and products, Design and build agent frameworks for complex, multi-step workflows, Go beyond RAG: tool use, structured outputs, multi-agent/multi-chain systems, Build eval and feedback loops (testing, scoring, iteration), Ship reliable, production-grade AI systems (accounting for latency, cost, and failure modes), Turn messy clinical processes into deterministic, auditable systems, Stay current with and experiment with SOTA technologies in the field. Competencies 5+ years of backend engineering experience, including 1-2+ years building LLM-based systems in production, Strong Python backend engineer (FastAPI, infrastructure, data structures), Real, hands-on experience with LLMs in complex, agent-based workflows, not just API calls to a foundation model, Comfortable guiding decisions on LLM/SLM fine-tuning strategy, Track record shipping multi-step/agentic systems to production, not just prototypes, Experience with evals, observability, and system reliability practices, Solid ML/NLP fundamentals, Prior experience in a startup or fast-paced environment strongly preferred, Fully fluent in English (mandatory). Stack: Python, FastAPI, LangGraph, Postgres, Vector DBs, GCP/AWS, Docker Recruitment process Screening with Patricio (Cofounder & CTO), Case study, Debrief with Cori engineers, Final interview with Emma (Chief Clinical Officer) and Jorn (Cofounder & CEO). Compensation & benefits 90-95K (EU) + equity, Hybrid 3 days in-office / Barcelona, Health insurance, Lunch vouchers through Cobee. Department Join our startups Role Tech Locations Barcelona Remote status Hybrid Yearly salary €90 - €95 Employment type Full-time Employment level Executive / Senior Level