For our Swiss client– a leading desktop solution for audit and revision processes – we are looking for an experienced Senior .NET Developer.

This is a stable, long-term project focused on maintaining and modernizing an enterprise-grade Windows Forms application used by public institutions and audit firms across Switzerland.

• Development and maintenance of a Windows Forms desktop application
• Implementation of new features, bug fixing, and performance optimization
• Working with relational databases (SQL Server, PostgreSQL)
• Participation in architectural decisions and system modernization
• Ensuring code quality, documentation, and best practices

• 100% remote (Switzerland; on-site visits 1–2 times per year)
• B2B cooperation via apreel
• Rate: up to 190 PLN net/hour
• Very long-term cooperation
• Start: ASAP

• Strong experience with C# and .NET Framework
• Minimum 8 years of hands-on experience with Windows Forms
• Solid knowledge of SQL and relational databases
• Understanding of desktop application architecture (3-tier)
• Experience with REST APIs
• Version control experience (SVN preferred)
• Awareness of security and data protection standards

• Cloud integration, automated testing
• PDF generation, Office integration
• Digital signatures and certificate management