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October 2, 2026
Senior Backend Developer (.NET)
Senior • On-site
160 - 180 PLN/yr
Warsaw, MA, Poland
Quick Facts
- Role: Senior Backend Developer (.NET)
Description
Design, develop, and maintain backend services and RESTful APIs using modern .NET. Build scalable, reliable, high-performance backend solutions, including data modeling and integration with relational and NoSQL databases, while collaborating with front-end developers on API contracts.
Responsibilities
- Design, develop, and maintain backend services and RESTful APIs using .NET
- Build scalable, reliable, high-performance backend solutions for client-facing applications
- Design data models and integrate services with relational and NoSQL databases
- Collaborate with front-end developers to define API contracts and ensure seamless system integration
- Develop and deploy applications in containerized environments using Docker and Kubernetes/OpenShift
- Apply secure coding standards and software engineering best practices
- Create and maintain unit and integration tests
- Integrate applications with CI/CD pipelines and automated deployment processes
- Monitor and optimize application performance, scalability, and reliability
- Troubleshoot technical and production issues and support resolution
- Participate in technical design discussions, sprint planning, code reviews, and other Agile activities
Requirements
- 8+ years of professional backend software development experience
- Strong commercial experience with .NET
- Hands-on experience with .NET Core / modern .NET
- Strong experience designing and developing REST APIs
- Experience with Docker and container orchestration platforms such as Kubernetes or OpenShift
- Good knowledge of SQL and relational databases, including data modeling and query optimization
- Experience with automated testing, including unit and integration testing
- Familiarity with CI/CD pipelines and modern software delivery practices
- Strong understanding of object-oriented programming and software engineering principles
- Ability to work effectively in cross-functional Agile development teams
- Fluency in English, both written and spoken
Benefits
- Private medical care
- Co-financing for a sports card
- Ongoing support from a dedicated consultant
- Employee referral program
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