Full Stack Engineer

Fullstack Engineer - AI

Hybrid - London

£70,000 - £80,000

Immersum are working with a medical-grade AI HealthTech company transforming clinical workflows across the UK. Their platform helps clinicians eliminate documentation burden through clinically safe and reliable AI systems already used in over 1 million consultations.

They’re hiring AI focused Full Stack Product Engineers to help build production grade AI systems used in high-stakes healthcare environments.

What you’ll do:

- Build and ship full-stack product features integrating deeply with LLMs in production

- Design systems resilient to hallucinations, output instability, and distribution shift

- Work closely with AI research teams to implement new architectures and model enhancements

- Contribute to AI output validation approaches, including multilingual clinical documentation quality

- Help maintain engineering quality, reliability, and safety standards in a regulated environment

- Work closely with product and design teams to deliver clinician-facing tools at scale

Tech stack:

React · TypeScript · Node.js/NestJS · Python/FastAPI · GCP · Kubernetes · Terraform · PostgreSQL · Redis · Pub/Sub · LLMs · AI Systems

Looking for:

- Strong full-stack engineering background with React + TypeScript

- Production experience building systems around LLMs - beyond simple API integration

- Deep understanding of failure modes in probabilistic systems

- Experience with output validation, fallback strategies, confidence thresholds, and human-in-the-loop workflows

- Familiarity with prompt engineering, RAG, fine tuning, or LLM evaluation frameworks

- Product minded engineers who enjoy ownership and shipping

Nice to have:

- Experience in clinical AI or other high-stakes AI domains

- Exposure to AI safety concepts in production

- Experience with internal AI evaluation or red-teaming exercises

- Familiarity with FHIR/HL7 integrations or event-driven architectures

Please note you must have full right to work for this position.