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November 3, 2026

Senior .NET Developer

Senior • On-site

Poznań, Poland

Quick Facts

  • Role: Senior .NET Developer (Backend/Web + REST API)
  • Focus: .NET ecosystem development
  • Work model: Hybrid (2 days/week in the Poznań office)

Description

Senior .NET Developer role focused on designing, building, testing, and maintaining backend and web applications plus REST API services in the .NET ecosystem. You will develop business logic and integrate systems, refactor and optimize existing solutions, support code quality through code reviews, and create technical documentation.

Responsibilities

  • Design, develop, test, and maintain .NET applications considering business and non-functional requirements
  • Build backend and web applications and REST API services
  • Develop business logic and system integrations
  • Refactor and optimize existing solutions
  • Ensure code quality (including active participation in code reviews)
  • Co-create solutions with analysts and architects
  • Prepare technical documentation

Requirements

  • Commercial experience in .NET development enabling independent delivery at a senior level
  • Very good knowledge of C# and ASP.NET Core
  • Experience designing and building REST API services
  • Practical knowledge of design patterns
  • Ability to work with Visual Studio, Git, and Azure DevOps with CI/CD processes
  • Polish language knowledge at C1 level

Benefits

  • Work within a reputable organization using international quality and security standards (ISO 9001, ISO 27001)
  • Non-corporate atmosphere and flat organizational structure
  • Continuous development through varied technologies, collaboration with experienced experts, and training/certifications support
  • Employee referral program
  • Values-driven culture (good intent, knowledge sharing, responsibility, continuous improvement, people-first, goal-oriented work, honest professional communication)
  • Medical care (LUX-MED), 50% funding for Multisport card, language learning support, wellbeing platform access

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