Senior Software Developer (m/w/d) - Windows (Softwareentwickler/in)

What you'll do

Core Development

• Design and develop new features for the Windows client application using modern .NET technologies ·
• Build and maintain desktop applications that handle file management, application launching, and session lifecycle management ·
• Implement security features including argument validation, secure file handling, and authentication integration ·
• Optimize application performance and reliability in enterprise environments

Architecture & Design

• Design and implement scalable application architecture for Windows client deployments ·
• Apply service-oriented patterns and dependency injection for maintainability and extensibility ·
• Create reusable components and libraries for document handling and session management ·
• Evaluate and recommend technology solutions for new features

Integration & Deployment

• Develop installer packages and deployment automation for enterprise distribution ·
• Implement integration with server-side components and cloud services ·
• Build custom installation logic and system validation checks ·
• Ensure compatibility with enterprise Windows environments and Group Policy configurations

Quality Assurance & Testing

• Write comprehensive unit and integration tests to ensure code quality and reliability ·
• Develop automated testing strategies covering multiple scenarios ·
• Participate in code reviews and knowledge sharing with team members ·
• Participate in security reviews and threat modeling

Technical Collaboration

• Communicate technical decisions and architectural rationale to team members and stakeholders ·
• Partner with product and security teams to translate business requirements into technical solutions ·
• Share knowledge and best practices through documentation and technical discussions

What you'll bring

• 7+ years of professional software development experience ·
• 4+ years developing Windows desktop applications (.NET ecosystem preferred) ·
• Strong understanding of application lifecycle management and deployment strategies ·
• Experience with version control systems and collaborative development workflows ·
• Proven track record delivering production-grade enterprise software
• · Proficiency in C# and modern .NET framework development
• · Experience with Windows application development, UI frameworks, and Windows API integration
• · Understanding of installer and packaging technologies
• · Knowledge of security principles for desktop applications (encryption, secure storage, input validation)
• · Experience with automated build and deployment systems
• · Solid grasp of testing frameworks and testing methodologies
• · Strong problem-solving and debugging abilities
• · Clear communication and documentation skills
• · Ability to take ownership of complex features and drive them to completion
• · Self-motivated with strong attention to detail
• · Experience working in Agile development environments

Essential Skills

• Technical depth combined with strong problem-solving abilities ·
• Ability to balance architectural vision with practical delivery timelines ·
• Collaborative approach to working with cross-functional teams ·
• Proactive approach to identifying and resolving technical risks ·
• Passion for building products that solve real business challenges

Nice to Have

• Knowledge of Windows Server deployment and management ·
• Background in security-focused software development ·
• Experience with PowerShell scripting and system automation ·
• Understanding of document management systems or content collaboration platforms ·
• Experience with enterprise authentication systems (Active Directory, SAML, OAuth) · Knowledge of RDP (Remote Desktop Protocol) or Terminal Services · Experience building cross-platform applications · Familiarity with CI/CD pipeline development

We are seeking a Senior Software Developer to enhance our Windows application, a secure document editing and collaboration platform. In this role, you will be a hands-on technical developer responsible for designing and building scalable systems, making sound technical decisions, and collaborating effectively with team members.