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# Senior Software Developer (Back-end)

- **Company:** ONYX Insight
- **Location:** Nottingham, UK
- **Experience:** Expert
- **Contract:** Temporary contract
- **Skills:** Clean Code Principles, Amazon Web Services, C Sharp (Programming Language), Cloud Computing, Software Quality, Relational Databases, DevOps, PostgreSQL, OnyX for Mac, Web Applications, ReactJS, Backend, Material UI, Front End Software Development
- **Published:** May 24, 2026
- **Apply:** https://uk.indeed.com/viewjob?jk=962b1452228c5ab6

## About the Role

Do you have experience in Relational databases?, * Strong commercial experience with C# .NET (5+ years preferred) - this is the core focus of the role

 * Solid experience with modern frontend tooling (state management, component libraries, testing frameworks)
 * Working knowledge of React (2+ years) to support frontend services
 * Proven track record delivering software in contract or fast-paced environments
 * Experience building scalable, performant web applications
 * Familiarity with cloud platforms (AWS preferred)
 * Experience with relational databases (PostgreSQL ideal)
 * Comfortable working autonomously, managing priorities, and delivering to tight timelines
 * Strong communication skills and a pragmatic, delivery-focused mindset.

## Description

Are you a highly skilled full stack contractor looking to make an immediate impact on a modern, high-visibility platform? At ONYX Insight, we're looking for a Senior Software Contractor to join our team, with a primary focus on backend delivery using C# .NET, alongside contributing to our React frontend services.

This is a hands-on contract role where you'll be trusted to hit the ground running, deliver high-quality code, and contribute to the evolution of our core platforms supporting the renewable energy sector.

You'll work closely with product, design, and engineering teams to build scalable, performant user interfaces, while also supporting backend integrations where needed., * Deliver High-Impact Backend Solutions: Own the development of responsive, high-performance applications using C# .NET (primary focus).

 * Full-Stack Contribution: Support frontend development with React (secondary focus), ensuring seamless integration between frontend and services.
 * Build & Ship Quickly: Work in an agile environment to design, develop, and release features efficiently with minimal oversight.
 * Collaborate Effectively: Partner with cross-functional teams to translate requirements into practical, user-focused solutions.
 * Drive Code Quality: Write clean, maintainable, and scalable code, following best practices across both frontend and backend.
 * Support Delivery & DevOps: Contribute to CI/CD pipelines and deployment processes to ensure reliable and consistent releases.


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