Senior Full-Stack Developer (.NET + React)

OpportuLand; United Kingdom; Remote; GBP 78,000 - 110,000; Full time

Job summary

OpportuLand in the United Kingdom is seeking a Senior Full-Stack Developer to join its digital healthcare platform. The role is backend-weighted, building ASP.Net Core Web APIs and the data layer, while also extending the React front end.

You will work with Azure services, implement tests with xUnit, Moq on backend and Vitest or Jest on frontend, participate in code reviews, architecture decisions, and CI/CD improvements. 5+ years of experience required, strong C#, .NET, React and TypeScript.

Qualifications

• 5+ years of commercial development experience.
• Strong C# and .NET: ASP.Net Core Web APIs, EF Core, SQL Server.
• Experience designing REST APIs and backend processing patterns.
• Strong React and TypeScript skills; familiarity with hooks and libraries.
• Hands-on Azure experience and containerized deployments.
• Git, Docker and CI/CD (GitLab) experience.
• Testing with xUnit/Moq on backend and Vitest/Jest/Playwright on frontend.

Responsibilities

• Design and build ASP.Net Core Web APIs and data layer with EF Core.
• Implement background processing: queues, scheduled jobs, event-driven messaging.
• Develop frontend features in React and TypeScript.
• Work with Azure services across the stack and CI/CD improvements.
• Contribute to code reviews, architectural decisions, and testing.

Skills

C# & .NET

ASP.Net Core Web APIs

Entity Framework Core

SQL Server

REST APIs

Background processing

React & TypeScript

Azure

Git & Docker

CI/CD (GitLab)

Testing (xUnit/Moq)

Vitest/Jest/Playwright

SignalR

Tools

Azure App Service

Storage Queues

Event Grid

Docker

GitLab

MongoDB

Redis

Nx monorepo

Job description

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 doDesign 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.Requirements5+ 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 haveNode.js and NestJS;MongoDB, Redis;Nx monorepo, Redux Toolkit;Terraform;Datadog or similar observability tooling.