Senior Software Engineer

Job Title - .NET Developer (Contract)

Location - London (Hybrid – 2–3 days onsite)

Contract Type - Contract (Outside IR35 / Inside IR35 – depending on client)

Duration -12 months (likely extension)

Day Rate - Competitive

Role Overview

We are looking for an experienced .NET Developer to join a delivery-focused engineering team working on business-critical systems in a fast-paced London-based environment. The role will involve building, enhancing and supporting modern .NET applications, collaborating closely with product, QA and DevOps teams, and contributing to the ongoing modernisation of legacy platforms.

This is a hands-on contract role suited to a developer who is comfortable owning features end-to-end and working in production environments.

Key Responsibilities

• Design, develop and maintain applications using C# and .NET / .NET Core
• Contribute to the development of RESTful APIs and backend services
• Work on the modernisation and refactoring of legacy .NET applications
• Collaborate with product managers, business analysts and QA to deliver high-quality features
• Write clean, testable and maintainable code following best practices
• Participate in code reviews and contribute to improving engineering standards
• Support production systems, including bug fixing and performance tuning
• Work within Agile / Scrum delivery teams

Required Skills & Experience

• Strong commercial experience with C# and .NET / .NET Core
• Experience building and consuming REST APIs
• Solid understanding of object-oriented design and software engineering principles
• Experience with SQL Server and relational databases
• Familiarity with unit testing frameworks (e.g. xUnit, NUnit, MSTest)
• Experience working in Agile delivery environments
• Comfortable working as a contractor in a delivery-focused role

Nice to Have

• Experience with cloud platforms (Azure preferred; AWS also acceptable)
• Knowledge of Docker and containerised applications
• Frontend experience with Angular, React or Blazor
• CI/CD experience using Azure DevOps, GitHub Actions or similar
• Experience in financial services or other regulated environments

If you're a Senior .NEt Developer who wants challenging work, modern tools, and the freedom that comes with contract roles, we'd love to hear from you.