Senior AI Engineer - @Cori

Breega; Barcelona; Híbrido; EUR 90.000 - 95.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

Health insurance

Lunch vouchers (Cobee)

Equity

Descripción de la vacante

Cori Clinical is building an AI-guided system to accelerate clinical trials, enabling faster medicine delivery. We seek a backend engineer with 5+ years of experience to own AI-related technical decisions across the company and products, including designing agent frameworks for complex workflows.

You will work with a small team of engineers, clinicians, and leaders, applying advanced LLM-based solutions and ensuring production-grade reliability in a hybrid Barcelona-based environment.

Formación

• 5+ years backend engineering experience, including in production.
• Strong Python backend development with FastAPI.
• Hands-on with LLMs in complex agent-based workflows.
• Experience guiding LLM/SLM fine-tuning strategy.
• Track record shipping multi-step/agentic systems to production.
• Familiar with evals, observability and reliability practices.
• Solid ML/NLP fundamentals; startup experience preferred.
• Fully fluent in English.

Responsabilidades

• 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 (latency, cost, failure modes).
• Turn messy clinical processes into deterministic, auditable systems.
• Stay current with and experiment with SOTA technologies in the field.

Conocimientos

Backend engineering

Python (FastAPI)

LLM-based systems

LLM fine-tuning

Multi-agent workflows

Observability & reliability

ML/NLP fundamentals

English fluent

Startup experience

Herramientas

LangGraph

Postgres

Vector DBs

GCP/AWS

Docker

Descripción del empleo

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.

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.