Senior C#. NET Developer Location: London (Hybrid) Contract: 6 months IR35: Inside IR35 Our client, a leading global investment bank, is looking for an experienced C#. NET Developer to join their team on a 6-month contract. This role is pivotal in modernising and supporting business-critical applications while contributing to greenfield development initiatives. Key ResponsibilitiesDesign, build, and maintain server-side and client-side applications using .NET Framework/Core, React/TypeScript, and relational databases (SQL Server, Oracle).Refactor legacy systems to reduce technical debt and improve performance.Implement modern security patterns (OAuth2/OpenID Connect, OWASP principles).Optimise database queries and schemas; ensure safe migrations.Participate in CI/CD processes, code reviews, and adhere to Change Management procedures.Collaborate with cross-functional teams and provide occasional out-of-hours support. Essential SkillsStrong proficiency in .NET Framework/Core.Experience with SQL Server and Oracle performance tuning.Knowledge of secure SDLC practices and OWASP principles.Hands-on experience with CI/CD pipelines and troubleshooting across Windows Servers and databases.Excellent communication and problem-solving skills. DesirableReact/TypeScriptCertifications in Azure/AWS, CISSP, or DevOps.Familiarity with Docker/Kubernetes, observability practices, and API gateways.Exposure to greenfield projects and Python scripting. Apply now to join a dynamic team and work on ..... full job details .....