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Senior Backend Developer @ SIENN Poland
  • Wrocław
Senior Backend Developer @ SIENN Poland
Wrocław, Wrocław, Lower Silesian Voivodeship, Polska
SIENN Poland
16. 3. 2025
Informacje o stanowisku

Project information:
We are working on a project for a large client from the Netherlands, focused on expanding web-based accounting and CRM software. The project leverages cloud technologies and follows a CI/CD approach, while the client continuously upgrades their technology stack.

Technology stack

  • C#
  • ASP .NET
  • Client’s custom WebForms solution
  • MS SQL Server
  • Azure DevOps
  • Selenium

What we offer:

Attractive remuneration: B2B 15 200 – 25 400 PLN/month net (includes 26 days of paid days off)
100% remote work opportunity available
We care about our employees’ development and stability
Work in an international environment
International training and certifications (e.g., Microsoft MCP)
Continuous personal growth: defined career paths, additional training leave, and training budget
Medical package, Multisport card, life insurance, and language courses
Modern office with a rooftop swimming pool
Knowledge sharing sessions: e.g., Agile Coffee/Agile Knowledge Sharing, Techzone, Chillzone
A great workplace atmosphere!

If you are passionate about technology and ready to embrace new challenges in an innovative environment, we look forward to receiving your application!


We are looking for an experienced Senior Backend Developer who:

  • Has a minimum of 5 years of experience in developing applications using .NET, especially in ASP .NET.
  • Understands solution implementation from both a developer and user perspective.
  • Has hands-on experience with Azure DevOps and Selenium.
  • Is knowledgeable in web application testing methodologies.
  • Can communicate effectively in English (minimum B2).
  • Experience with ERP systems is a plus.

Project information:
We are working on a project for a large client from the Netherlands, focused on expanding web-based accounting and CRM software. The project leverages cloud technologies and follows a CI/CD approach, while the client continuously upgrades their technology stack.

Technology stack

  • C#
  • ASP .NET
  • Client’s custom WebForms solution
  • MS SQL Server
  • Azure DevOps
  • Selenium

What we offer:

Attractive remuneration: B2B 15 200 – 25 400 PLN/month net (includes 26 days of paid days off)
100% remote work opportunity available
We care about our employees’ development and stability
Work in an international environment
International training and certifications (e.g., Microsoft MCP)
Continuous personal growth: defined career paths, additional training leave, and training budget
Medical package, Multisport card, life insurance, and language courses
Modern office with a rooftop swimming pool
Knowledge sharing sessions: e.g., Agile Coffee/Agile Knowledge Sharing, Techzone, Chillzone
A great workplace atmosphere!

If you are passionate about technology and ready to embrace new challenges in an innovative environment, we look forward to receiving your application!

,[ Requirements: .NET, C#, ASP.NET, MS SQL Server, Azure DevOps, Selenium, Testing methodologies, ERP, English Additionally: Remote work, International environment, English lessons with Native Speaker, Trainings, Medical package, Life & group insurance, Swimming pool, Integration events, Great atmosphere, Multisport card, Free coffee, Bike parking, Free lunch, In-house trainings, Modern office, No dress code, Parking, Basen, Knowledge sharing.

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