Strategic European project in Microsoft and .NET environment, focused on evolving FRONTEX’s training management platform. This is a freelance\-only position, ideal for senior developers seeking long\-term collaboration and technical leadership in an international setting. Tasks **Custom development and technological evolution:** * Migrate SharePoint 2019 systems to SharePoint Subscription * Redesign Microsoft\-based solutions independent of SharePoint * Design and develop new features for the training management platform * Create prototypes and new applications based on the Product Backlog * Optimize performance, security, and accessibility (including screen reader testing) * Produce technical and user documentation * Report development progress, estimate effort, and define development standards * Collect and interpret software metrics * Train administrators in the use of the applications **Maintenance and technical support:** * Perform corrective, adaptive, and preventive maintenance of .NET systems * Provide 2nd and 3rd level technical support * Update software and fix vulnerabilities * Maintain technical documentation and reporting * Collaborate in defining requirements for adaptive maintenance Requirements This opportunity is open exclusively to FREELANCE professionals. **Professional experience:** * Minimum 5 years with Angular, .NET, and SharePoint * Participation in at least 2 ICT projects focused on knowledge management, workflows, and business processes * Experience in developing corporate\-level enterprise systems * Involvement in at least one full development lifecycle **Technical skills:** * Design and development of data, business logic, and presentation layers (UI) * UML knowledge * Experience in Scrum / Agile environments * Ability to lead technical teams * Skilled in documenting technical solutions clearly and structurally * Strong problem\-solving abilities **Education and certifications:** * University degree in ICT (mandatory) * Advanced certification in software development technologies (mandatory) * English level B2 (Common European Framework), validated by certificate or test Benefits * Long\-term freelance contract (up to 4 years) . * Modality: Warsaw Far\-Site. * On\-site presence required: 20 days/year (paid at €570/day). * Remaining service delivered remotely (€310/day) * Participation in key digital transformation projects for a European agency Ready to contribute to high\-impact enterprise solutions in a stable, long\-term freelance collaboration? Apply now and elevate your career in high\-performance Microsoft environments.