Job Description 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. 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 environmentsArchitecture & 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 featuresIntegration & 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 configurationsQuality 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 modelingTechnical 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· Develop and maintain secure code following secure development lifecycle practices, ensuring protection of personal data and adherence to ISO 27001 and privacy-by-design principles. 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 environmentsEssential 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 challengesNice 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 The Values That Define Us • Execution – We deliver results with focus, ownership, and consistency. Our teams take initiative, solve challenges proactively, and continuously optimize how we work to create meaningful impact for our customers. • Transparency – We communicate openly and clearly, ensuring stakeholders have the information they need to make informed decisions. We foster a culture of trust, welcome feedback, and embrace accountability in everything we do. • Integrity – We uphold the highest standards of honesty and responsibility. Our teams act ethically, consistently honor commitments, and build trust through principled, reliable actions. Compensation Range: • Annual Base Salary Range: €65,000 - €78,000 • Base pay depends on many factors, such as location, education, experience, and skills. Base pay is only one part of Kiteworks competitive Total Rewards package that can include benefits, perks, equity, and bonuses. The base pay range is subject to change and may be modified in the future. Job Benefits • Your Equipment: Mac or Microsoft – you work with the IT equipment of your choice. • Your Pension: We contribute 20% to your company pension scheme (BAV) and also cover ongoing contracts. • Your Discounts: Enjoy attractive employee discounts via Bitkom with numerous well-known providers. • Your Extra: Shop with the Edenred gift card, with an average of €20 per month. • Your Stock Options: After one year with us, you have the opportunity to participate in our stock option program. • Your Flexibility: With your flexitime account, you can make up for longer days at any time. • Your Birthday: Celebrate yourself with a special day off on your birthday. • Your Engagement: Use a special vacation day to engage in social or environmental causes. Co