C# Developer

Salary: £68,000 - 108,000 per year

Requirements:

• Strong commercial experience with C# and modern .NET (.NET 6+), including asynchronous programming and dependency injection.
• Experience building RESTful APIs and service-oriented architectures; microservices experience is beneficial.
• Solid knowledge of SQL and database fundamentals, with familiarity in ORM tools such as Entity Framework and performance tuning.
• Experience with automated testing using xUnit, NUnit, or MSTest, plus mocking and test-driven practices.
• Understanding of secure coding principles, authentication and authorisation such as OAuth2 and OpenID Connect, and data protection.
• Comfortable with Git, branching strategies, and CI/CD tools such as Azure DevOps, GitHub Actions, or similar.
• Strong communication skills and experience working in Agile or Scrum teams.
• Eligibility to work in the UK.
• Financial services domain exposure is desirable, including payments, trading, risk, compliance, or core banking.
• Cloud experience with Azure or AWS, containers such as Docker, and orchestration such as Kubernetes is desirable.
• Experience with messaging and event streaming tools such as Kafka, RabbitMQ, or Azure Service Bus, and distributed systems patterns is desirable.
• Observability tooling experience, including logging, metrics, and tracing, plus production support experience, is desirable.
• A pragmatic approach to delivery with attention to quality and detail.
• Ability to work effectively with stakeholders in a regulated, audit-conscious environment.
• A continuous learning mindset and willingness to mentor and share best practice.

Responsibilities:

• Design, build, and maintain backend services and APIs using C# and .NET.
• Develop scalable, low-latency components with a focus on performance, reliability, and security.
• Work with relational databases, preferably SQL Server, including schema design, query optimisation, and stored procedures where appropriate.
• Integrate with internal and third-party systems using REST and messaging patterns.
• Write clean, testable code; create unit and integration tests; and support automated CI/CD pipelines.
• Participate in code reviews, technical design discussions, and incident and problem management.
• Contribute to documentation, operational readiness, monitoring, and continuous improvement.
• Work across the full software development lifecycle, collaborating with engineering, QA, product, and stakeholders to build and enhance solutions used in regulated environments.

Technologies:

• AWS
• Azure
• Backend
• C#
• CI/CD
• Cloud
• DevOps
• Docker
• Git
• GitHub
• Support
• Kafka
• Kubernetes
• OpenID
• REST
• RabbitMQ
• SQL
• Security
• microservices
• ASP.NET

More:

We are a financial services technology team in London delivering high-performance, secure, and resilient systems. This role offers a salary of 90,000 per annum and the opportunity to work across the full software development lifecycle in a regulated environment, collaborating with engineering, QA, product, and other stakeholders to build and enhance solutions.

last updated 36 week of 2026