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October 2, 2026
Senior .NET Backend Developer
Senior • On-site
140 - 165 PLN/yr
Warsaw, MA, Poland
Quick Facts
- Role: Senior .NET Backend Developer (Backend / Client Portal)
Description
Develop and maintain backend services and RESTful APIs for a client portal using .NET (.NET Core). Design data models and integrate with relational/NoSQL databases, collaborating with front-end developers to define API contracts. Build and deploy services in containerized environments, ensuring secure coding, testing, CI/CD integration, and reliable production operations.
Responsibilities
- Develop and maintain backend services and RESTful APIs using .NET (.NET Core)
- Design data models and integrate with relational/NoSQL databases
- Collaborate with front-end developers to define API contracts
- Build and deploy services in Docker/Kubernetes/OpenShift environments
- Apply secure coding practices, unit/integration testing, and CI/CD integration
- Optimize performance, scalability, and reliability
- Troubleshoot and resolve production issues; participate in on-call/support rotations
- Participate in Agile ceremonies, sprint planning, and technical design discussions
Requirements
- 8–10+ years of backend software development experience with strong expertise in .NET
- Experience with .NET Core
- Experience building and consuming REST APIs
- Experience with containerized applications and orchestration (Docker/Kubernetes/OpenShift)
- Working SQL/database experience (relational data modeling and query optimization)
- Familiarity with CI/CD pipelines and automated testing practices
Benefits
- Agile work with sprint planning and technical design discussions
- Opportunity to work with containerized, secure, test-driven backend services and modern CI/CD practices
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