Senior C# .Net Developer

Role: Senior C# .NET Developer
Location: London, UK
Working Pattern: Hybrid, 3 days per week onsite, Canary Wharf or Liverpool Street
Employment Type: Contract

Rate: £500 a day Inside IR35 via Umbrella

We are seeking experienced Senior C# .NET Developers to join a strategic technology transformation programme within a leading international banking environment.

The successful candidates will design, develop and enhance enterprise-grade applications supporting critical business functions across front-office, middle-office and back-office domains. They will work closely with Solution Architects, Technical Analysts, Business Analysts, Data Engineers and QA teams to deliver scalable, secure and high-performing solutions in a highly regulated environment.

• Design, develop and maintain enterprise applications using C# and .NET.
• Develop scalable, secure and high-performance APIs, services and distributed applications.
• Work with Technical Analysts and business stakeholders to translate requirements into technical solutions.
• Contribute to solution architecture, technical design and code reviews.
• Develop RESTful APIs and integration services.
• Implement monitoring, logging and error handling.
• Work with relational and non-relational databases.
• Develop automated unit, integration and regression tests.
• Support CI/CD and Dev Ops practices.
• Troubleshoot production issues and perform root-cause analysis.
• Follow engineering, security and development standards.
• Participate in Agile delivery.
• Support application modernisation and cloud adoption.

• Strong commercial C#/.NET development experience
• .NET Core / .NET 6+
• ASP.NET Core / Web API
• REST APIs and microservices
• SQL Server, including complex queries, stored procedures and optimisation
• Entity Framework / ORM
• Object-oriented design and design patterns
• Distributed systems and enterprise integration
• Unit and automated testing
• Azure Dev Ops, Git and CI/CD
• Agile/Scrum delivery
• Strong troubleshooting and problem-solving capability
• Good stakeholder communication

• Banking, Capital Markets or Financial Services
• Azure
• Docker / Kubernetes
• Kafka, RabbitMQ or Azure Service Bus
• Event-driven architectures
• React / Angular
• Cloud-native development
• Application observability and performance engineering
• Dev Sec Ops  and secure coding

C# | .NET Core/.NET 8 | ASP.NET Core | REST APIs | SQL Server | Entity Framework | Azure | Azure Dev Ops | Git | Docker | Kubernetes | Kafka | Redis | JSON/XML | Swagger/OpenAPI