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# Senior .NET Backend Developer

- **Company:** Oscar Associates (UK) Ltd
- **Location:** York, UK
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** ASP.NET, .NET Framework, Computer-Aided Design, Application Programming Interfaces (APIs), Automation of Tests, C Sharp (Programming Language), Software Quality, Relational Databases, Dependency Injection, DevOps, Distributed Systems, Elasticsearch, PostgreSQL, Enterprise Messaging Systems, Software Architecture, RabbitMQ, Redis, Prometheus, Software Engineering, SQL Databases, Systems Integration, Datadog, Grafana, Backend, Solid Principles, Graphql, Restful APIs, Docker
- **Published:** September 10, 2026
- **Apply:** https://www.totaljobs.com/job/senior-backend-developer/oscar-associates-uk-limited-job107962449

## About the Role

* 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.

## Description

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., * 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.


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