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August 10, 2026

Full Stack Developer (.NET / React)

Senior • Remote

140 - 150 PLN

Warsaw, Poland

The opportunity

As a Fullstack and Support Engineer, you will help clients build fast, reliable software that improves customers’ everyday lives. You will participate in international projects designing modern, high-quality, responsive products that meet or exceed expectations. You will use advanced technology stacks, develop and implement new solutions, and collaborate with industry leaders.

Key responsibilities

  • Develop new applications for internal and external clients.
  • Add functionality and features to existing projects.
  • Maintain existing applications.
  • Support enterprise applications in a 24x7 environment.
  • Manage incidents, service requests, and production issues.
  • Troubleshoot issues, perform root cause analysis, and drive continuous service improvement.
  • Collaborate with development, infrastructure, QA, and business stakeholders.
  • Maintain a strong focus on software quality, testing, and automation.
  • Participate in on-call rotations, including nights, weekends, and public holidays.

Requirements

  • Experience providing L2/L3/L4 application support for business-critical systems.
  • ITIL certification or previous experience in production support environments.
  • Very good knowledge of C#, .NET Framework, .NET Core/.NET 6+, ASP.NET MVC, and ASP.NET Web API.
  • Experience with React, JavaScript (ES6+), TypeScript, HTML5, CSS3, and Material UI.
  • Experience developing and maintaining REST APIs and microservices.
  • Hands-on experience with Azure SQL, Cosmos DB, and data integration concepts.
  • Knowledge of Azure services, Azure DevOps, and CI/CD pipelines.
  • Experience using monitoring and observability tools for production support and troubleshooting.
  • Proficiency with Git and source-control management tools, including GitHub and Azure Repos.
  • Working knowledge of Docker and container-based development.
  • Strong communication skills and ability to collaborate in a global support model.
  • Very good English, minimum B2.

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