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C# Developer (Architecture Focused)
London, 3 days per week on site required
6-month initial contract
£400.00 via umbrella per day
The Opportunity
We're looking for a senior C# Developer with a strong architectural focus to join a highly skilled engineering team working on business-critical systems at scale. This role sits at the heart of a major technology estate and offers the chance to modernise legacy platforms, shape technical direction, and contribute to secure, high-performance solutions.
You'll work across both transformation initiatives and greenfield development, collaborating closely with engineering, DevOps, DBAs, and governance teams in a structured, enterprise environment.
What You'll Be Doing
Designing and developing applications using .NET Framework / .NET Core, React / TypeScript, Python, and relational databases
Refactoring and modernising legacy systems to reduce technical debt and improve performance and reliability
Embedding modern security patterns across APIs and services (authentication, authorisation, OWASP controls, secure access)
Contributing to greenfield solutions, ensuring scalability, maintainability, and security from day one
Optimising SQL Server and Oracle databases and supporting safe releases through change management processes
Supporting production systems and collaborating across global technology teams
What We're Looking For
Strong experience with C#.NET in complex or enterprise environments
Proven ability to modernise legacy applications
Good architectural understanding and secure development mindset
Experience with SQL Server and/or Oracle
Comfortable working across the full SDLC in a controlled environment
Candidates will ideally show evidence of the above in their CV to be considered please click the "apply" button.
We use generative AI tools to support our candidate screening process. This helps us ensure a fair, consistent, and efficient experience for all applicants. Rest assured, all final decisions are made by our hiring team, and your application will be reviewed with care and attention.
Please be advised if you haven't heard from us within 48 hours then unfortunately your application has not been successful on this occasion, we may however keep your details on file for any suitable future vacancies and contact you accordingly
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