Full Stack Engineer

Fullstack Engineer - AI
Hybrid - London
Up to £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
- Commercial thinking
- System design skills

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.