Senior Fullstack Engineer - UK

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About the role

We’re Heidi. We're building the future of healthcare by giving every clinician the earth's finest AI Care Partner. Our platform has absorbed the administrative chaos of 175 million patient visits and supported 67 million clinical hours. Today, we support 2.8 million patient sessions a week across 190+ countries, in 110 languages and over 200 specialties. Healthcare systems are failing us; clinicians spend more time on documentation than on patients, and the human connection that makes medicine worth practicing is eroding. Our mission is simple: double the world’s capacity for care and strengthen the human connection at its heart. We found product-market fit with a freemium medical scribe that clinicians love. Now, we're expanding. Every task a clinician hands to Heidi is a patient who feels more attended to, a health system unclogged, and a clinician who gets to be a clinician again. We’ve grown annual recurring revenue from $1 million to $50 million in two years. To go further, we’ve secured US$340 million: a $100 million Series C led by Blackbird, with Phoenix Court, Point72 Private Investments and Headline, alongside a $240 million growth investment led by General Catalyst’s Customer Value Fund. If you want to join us in doing work worth shipping, jump in. The role A Senior Full-Stack Engineer who owns new features end-to-end: the React interface a clinician clicks, the Python service behind it, and the data model underneath. You have shipped SaaS products inside a high-growth startup, and a slow query bothers you as much as a component that drops frames. You know where the trade-offs live on both sides of the stack: when logic belongs in the browser and when it belongs on the server, and how a schema decision made today shows up as latency on screen in six months. You take a loose brief and return a working, tested feature without waiting for a hand-off from another team. You read the user need behind the ticket. You thrive in a flat, flexible team, and you pick up the specifics of building an AI product for clinicians in 190+ countries within your first weeks. Brilliant people come from unlikely places. If you have a record of shipping hard, technically demanding products and features, whatever the industry, we want to meet you. What you'll do You will work alongside the engineers who built Heidi, shipping AI products that change how healthcare runs. • Own features from database to browser: design the data model, build the Python service, ship the React and TypeScript interface, then watch how clinicians use it and iterate. • Build fast, accessible interfaces in React, TypeScript and Next.js that hold up for a GP seeing twenty patients before lunch. • Design, build and run high-performance backend services in Python, with MongoDB and Redis for storage and caching. • Design APIs the rest of engineering and the AI team build on, and own their versioning, documentation, testing and security. • Develop and manage message queue systems for real-time data processing. • Shape the cloud infrastructure your features run on so they scale and stay up. • Pair with product, design and AI engineers to turn a brief into a shipped workflow, then measure and go again. • Write code your colleagues can read, test and extend six months from now. What you'll need • 5+ years of software engineering experience, with production work on both the frontend and the backend. • Strong React and TypeScript, plus Next.js or a comparable framework. You know the browser: rendering performance, state management, accessibility. • Python in production: building, testing and running backend services. • Hands-on MongoDB and Redis, with sound judgment on data modeling, design patterns and trade-offs. • Experience building and managing messa

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