Senior Full-Stack Developer (.NET + React)

We are looking for a Senior Full-Stack Developer to join a UK-based digital healthcare company that combines digital tools with clinical expertise to deliver medical and wellbeing services through its online platform.

This role is backend-weighted: you will build ASP.Net Core services that power patient-facing products, and also work on the React frontend that consumes them.

What you'll do

• Design and build ASP.Net Core Web APIs and the data layer behind them (Entity Framework Core, SQL Server);
• Implement background processing: queues, scheduled jobs, and event-driven messaging;
• Build and maintain frontend features in React and TypeScript;
• Work with Azure services across the stack: App Service, Storage Queues, Event Grid, SignalR;
• Cover your work with tests on both sides: xUnit and Moq on the backend, Vitest or Jest and Playwright on the frontend;
• Take part in code review, architectural decisions, and CI/CD improvements.

Requirements

• 5+ years of commercial development experience;
• Strong C# and .NET: ASp.Net Core Web APIs, Entity Framework Core, SQL Server;
• Solid experience designing REST APIs;
• Practical experience with background processing: queues, scheduled jobs, event-driven messaging;
• Strong React and TypeScript: hooks, React Query or similar, component libraries such as MUI;
• Hands-on experience with Azure (App Service, Storage Queues, Event Grid, SignalR);
• Git, Docker, and CI/CD (GitLab);
• Testing: xUnit and Moq, Vitest or Jest, Playwright;
• Good spoken and written English.

Nice to have

• Node.js and NestJS;
• MongoDB, Redis;
• Nx monorepo, Redux Toolkit;
• Terraform;
• Datadog or similar observability tooling.