.NET Developer


Hi! We are SIENN - an international softwarehouse. We specialize ourselves in development and implementation of software products for companies mainly from Europe, and the United States. We are a group of enthusiasts - engineers whose passion is to create useful IT solutions.

Job Details
We are SIENN Living Online Technology! Let’s grow together!
Do you want to become a part of something new? We are looking for software enthusiasts, who are open to new challenges and new technologies. If you want to work in international team and have fun – join us!


You will be working with professionals who are focused on delivering usable software which helps to increase productivity and optimize business processes. In our projects we use .NET Core for backend and one of two technologies like Angular or React for frontend application.
As a team member you have influence on architecture of the solution from beginning to the end.

We are looking for a people who

  • Are good .NET developers- minimum 4 years of experience
  • Like to write clean code
  • Enjoys working with people
  • Speaks English
  • Is creative with a ‘can do’ attitude

You are an ideal candidate if you

  • Know C# well
  • Are familiar with .NET 4.5 and ASP.NET MVC (5)
  • Have knowledge of Entity Framework
  • Know .NET core2.0
  • Windows Communication Foundation
  • MS SQL Server 2008/2012

 Extra points for

  • Being familiar with Atlassian Jira
  • Experience in Xamarin
  • AngularJS
  • Continuous Integration

We offer:

  • An exciting position where you can have fun creating value
  • Excellent opportunities for further personal and professional growth
  • Being a part of our highly capable and motivated team with a great team spirit
  • Ability to work in agile methodologies (Agile / SCRUM)
  • Attractive conditions of employment (contract or B2B)
  • International training and certification (Microsoft MCP)
  • Medical package and Multisport card


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Need Help ?

Any questions? Please do not hesitate to contact me

Katarzyna Skowronek

HR Specialist

+48 889 783 562