Senior Full-Stack Engineer for AI Healthcare Platform

Heidi; Greater London; On-site; GBP 90,000 - 140,000; Full time

Benefits offered by this job

Health and dental cover

Learning budget

Wellness allowance

Home office budget

Parental leave

Job summary

Heidi is hiring a Senior Full-Stack Engineer to own features end-to-end—from React interfaces to Python services and underlying data models. You’ll ship SaaS features in a high-growth healthcare AI product, balancing browser and server logic for speed and reliability.

You’ll thrive in a flat, flexible team, shipping in 190+ countries, with a focus on performance, security and maintainable code. Join us to ship impactful healthcare software.

Qualifications

• 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 message queue systems at scale.
• Deep understanding of API design: security, versioning, performance and the contract between client and server.
• Application and data security knowledge on both sides of that contract.
• Experience integrating with third-party systems.
• Testable, communicative code, and fluency with source control and CI/CD pipelines.
• A record of building systems that scale, stay up under load and hold up to security scrutiny.
• Passion for AI, shown through hands-on building, prototyping or side projects.
• You default to building over requesting.
• You're confident in your thinking and open to being wrong. Great ideas win regardless of who surfaces them.

Responsibilities

• 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.

Skills

React

TypeScript

Next.js

Python

MongoDB

Redis

APIs

CI/CD

Security

Testing

Data modeling

Tools

MongoDB

Redis

Python

React

TypeScript

Job description

Heidi is hiring a Senior Full-Stack Engineer to own features end-to-end—from React interfaces to Python services and underlying data models. You’ll ship SaaS features in a high-growth healthcare AI product, balancing browser and server logic for speed and reliability.

You’ll thrive in a flat, flexible team, shipping in 190+ countries, with a focus on performance, security and maintainable code. Join us to ship impactful healthcare software.