Senior .NET Engineer (WinForms)

Our client owns a mature .NET desktop product that has been successfully operating on the market for 20 years. It is a business-critical solution for auditing and tax consulting companies in Switzerland and is tightly aligned with legal and regulatory frameworks that are updated on a yearly basis. The application is predominantly a Windows Forms desktop solution, integrated with cloud databases and complemented by a small number of web-based integrations.

We are looking for a Senior .NET Engineer (WinForms) to join our team.

Requirements:

• Six years of working experience with .NET (at least)
• Excellent knowledge of C#, .NET Framework
• Five-year hands-on experience with Windows Forms in production systems
• Solid understanding of desktop application architecture and deployment models
• Strong experience with SQL and ADO.NET
• Practical experience with Microsoft SQL Server, PostgreSQL
• Understanding of database design, transactions, and performance optimization
• Experience working with REST APIs and third-party integrations
• Understanding of basic design patterns
• Ability to work independently with huge codebases
• Strong analytical and problem-solving skills
• High attention to code quality, stability, and maintainability
• Experience with cloud integration or hybrid desktop–cloud solutions (would be a plus)
• Familiarity with encryption and security principles (AES, RSA, obfuscation) (would be a plus)
• Awareness of data protection regulations (GDPR, Swiss Data Protection Act) (would be a plus)
• Bachelor’s or Master’s degree in computer science (or similar technical field)
• English level: Upper-Intermediate or higher

Responsibilities:

• Develop and maintain a mature .NET desktop application used in regulated environments
• Implement new features based on business and regulatory requirements
• Fix bugs, troubleshoot production issues, and improve system stability
• Refactor and optimize existing code with a focus on performance and maintainability
• Work closely with the current lead developer during the handover phase
• Gradually take ownership of core modules and system components
• Participate in defining and evolving technical and architectural decisions
• Contribute to shaping a long-term modernization roadmap (starting from year 2)
• Write and maintain technical documentation to ensure knowledge continuity
• Perform code reviews and promote best development practices
• Develop automated unit/integration tests
• Collaborate with other developers and act as a technical mentor when needed
• Ensure compliance with security and data protection requirements
• Support regular releases, versioning, and deployments

We offer:

• Interesting and challenging projects
• Competitive compensation and regular results-based salary review
• A broad range of professional education and personal development possibilities
• Comfortable and cozy working environment
• Motivated colleagues with profound knowledge of the technical field

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