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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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