Backend Developer

We are SIENN Living Online Technology! Let’s grow with us!
Do you want to be a part of something meaningful? We are working on an international project in the financial sector for a Dutch Client specializing in audits, accounting, payroll, HR, and tax advisory.

Project Information:
We are supporting the development and modernization of an existing accounting application.

Role:
As a Backend Developer, you will:

• Build and modernize backend services using ASP .NET Core MVC and .NET 8+
• Participate in migration to Microsoft Azure
• Ensure code quality and scalability
• Collaborate with international teams

Technology stack:

• ASP .Net Core MVC, .Net 10, C#
• Azure
• Entity Framework
• Docker
• Git, MS SQL Server

What we offer:

• B2B rate: 90 - 125 PLN/h
• Work in an international project environment
• Access to international training and certifications (e.g. Microsoft MCP)
• Opportunities for professional development and knowledge sharing
• Possibility to access optional benefit platforms (medical care, sports card, insurance, language courses)
• Collaborative and supportive project environment