Junior Full stack Engineer in Kensington and Chelsea

Junior Full Stack Engineer – Health-Tech Startup (YC-Backed)

London | ON SITE | Permanent

We're hiring on behalf of a fast-moving, YC-backed health-tech startup building a knowledge graph connecting over 9 million US healthcare professionals, turning fragmented data into real-time signals for pharma teams.

This is a role for someone early in their career who's already built something real, whether that's a side project, an open-source tool, a hackathon win, or your own product, and wants to keep building at pace with a small team that gives you real ownership from day one.

What you'll do

• Own real pieces of data infrastructure and product from an early stage
• Work through messy, ambiguous problems: a confusing data source, an unclear requirement, something that just needs solving. You'll work out what "good" looks like and build it
• Get hands-on with Python, SQL, MongoDB, TypeScript, React, and LLMs in production pipelines

What we're looking for

• Evidence you can learn and build fast: a strong personal project, competitive performance, research, or work well beyond your level. We care about the evidence, not where it came from
• You've taken something from an idea to something real, used, depended on, or running in production. Not just coursework
• Genuine appetite for ambiguity, messy data, and early-stage pace
• Comfortable in a small, fast-moving team with real responsibility from the start

Nice to Have

• Background in bio-pharma, healthcare data, or life sciences

• Prior experience as a founding engineer or early technical hire at a startup