Senior Backend Developer (C# / .NET)

Deliver contracted backend and API enhancements to agreed scope quality and schedule Maintain service availability performance and SLA compliance across the platform estate Sustain and progressively improve both NET Framework 4 8 and NET Core services Improve database performance and query efficiency across SQL Server workloads Strengthen test coverage deployment automation and technical documentation

Job Description amp Responsibilities

• Design develop and maintain REST APIs and backend services
• Develop and maintain services across both NET Framework 4 8 and NET Core
• Design and optimize SQL Server databases including queries stored procedures indexing and performance tuning
• Implement API authentication and authorization
• Debug troubleshoot and support existing backend applications in production
• Analyse application logs and monitoring output to diagnose production issues and participate in incident investigation and root-cause analysis
• Contribute to incident and RCA documentation
• Participate in the out-of-hours and on-call support rota for production issues
• Work from Azure Boards and maintain a clean delivery audit trail in Azure DevOps
• Write and maintain unit and integration tests
• Contribute to CI CD pipelines and deployment processes
• Support services deployed across both cloud and data-centre-hosted environments
• Write clean maintainable well-structured code and participate in code reviews
• Produce and maintain technical documentation
• Work effectively within an existing development team and alongside frontend and mobile engineers

Qualifications & Experience

• Bachelor Degree in Computer Science or a relevant field.
• Minimum 4 to 5 years professional backend development experience
• Experience maintaining and extending established applications across both .NET Framework and .NET Core
• Demonstrated experience delivering and supporting production-grade backend services and APIs
• Experience taking independent ownership of technical problems through to production-ready resolution
• Experience working within Agile delivery environments and structured code review processes
• Willingness to participate in an out-of-hours support rotation