Fullstack Developer

We are SIENN Living Online Technology! Let’s grow with us!
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 an international team and have fun – join us!

Project Information:
An international project in the financial sector for a Dutch client specializing in audits, accounting, payroll, HR, and tax advisory. The goal is to support the development of an existing accounting application.

The project uses cloud technologies and the CI / CD approach.

Technology Stack:


  • ASP .Net Core MVC
  • .Net 4.7/4.8
  • .Net 8.0
  • C#
  • Azure
  • Entity Framework
  • Git
  • MS SQL Server


  • React 18
  • Typescript

What We Offer:

  • B2B: 15 200 – 25 400 PLN/month net (includes 26 days of paid days off)
  • Work in an international environment
  • Fully remote work (it is also possible to work from the office in Wrocław or in hybrid mode)
  • Work in SIENN teams (not outsourced)
  • International training and certifications (Microsoft MCP)
  • Constant personal growth (defined career paths, additional leave for training, training budget)
  • Medical package, Multisport card and life insurance
  • Thursday lunches at the office
  • Modern office with a swimming pool on the roof
  • Great atmosphere at workplace!

Job Requirements:

  • Experience with ASP .NET Core MVC and .NET 4.7/4.8
  • Proficient in C# and .Net
  • Experience in programming in React (16+)
  • Strong proficiency in TypeScript/ JavaScript
  • Good understanding CI/CD pipelines
  • Experience with REST API’s
  • Experience with Azure Cloud
  • Knowledge of MS SQL Server
  • Good command of English, both spoken and written

Nice to Have:

  • Experience with work in an Agile environment
  • Experience with Docker
  • Knowledge of Zustand store


If you have questions about this position, contact me 🤙

Aneta Zawieja

HR Specialist

+48 535 566 283

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    Claartje Pothof-van der Zande

    HR Specialist

    +31 24 366 0 466


    Aneta Zawieja

    HR Specialist

    +48 535 566 283


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