Senior .NET Backend Developer

Senior .NET Backend Developer

Location: York (Hybrid - 2 days per week)
Salary: Competitive + Benefits

We're partnering with an established technology business undergoing a significant platform modernisation programme and are looking to appoint a Senior .NET Backend Developer to play a key role in shaping the future of its engineering capability.

This is a hands-on senior engineering position, working closely with product and engineering teams, you'll help drive technical direction, champion best practice and contribute to the evolution of a high-performing development function.

The Role

• Design, develop and maintain backend services and APIs using C# and modern .NET / ASP.NET Core.
• Contribute to architectural decisions across backend services, integrations and data.
• Modernise legacy applications into scalable, maintainable web-based solutions.
• Collaborate with cross-functional teams to deliver robust technical solutions.
• Promote engineering best practices, including automated testing, code quality and security.
• Investigate and resolve complex production issues.
• Support technical leadership through mentoring, knowledge sharing and architectural guidance.

Required Experience

• Commercial experience with C#, .NET and ASP.NET Core.
• Strong background developing scalable APIs and backend services.
• Experience designing software architecture and distributed systems.
• Solid SQL and relational database knowledge.
• Strong understanding of software design principles, dependency injection and automated testing.
• Experience working on complex or legacy software modernisation projects.
• Excellent communication skills with the ability to influence technical decisions.

Desirable Skills

• Docker and Kubernetes.
• PostgreSQL, Redis or Elasticsearch.
• GraphQL.
• RabbitMQ or other messaging technologies.
• CI/CD pipelines and modern DevOps practices.
• Observability tooling such as Grafana, OpenTelemetry or Prometheus.
• Experience using AI-assisted development tools within the software development lifecycle.

What's on Offer

• Hybrid working (2 days per week in York).
• Flexible working hours.
• Opportunity to influence architecture and technical strategy.
• Modern technology environment with investment in engineering tooling.
• Excellent benefits package.

Oscar Associates (UK) Limited is acting as an Employment Agency in relation to this vacancy.

To understand more about what we do with your data please review our privacy policy in the privacy section of the Oscar website.