Fullstack .NET Developer (Angular | Flutter | .NET | SQL)Kraków (Hybrid) | Full-time | 3+ years experience At TISSL/part of ClearCourse Group we’re looking for a Software Engineer to join our dynamic development team and help build high-quality, scalable applications that make an impact. This role focuses primarily on frontend development using Angular and Flutter, while also supporting backend services built with C#/.NET and SQL.You’ll work closely with cross-functional teams to deliver secure, performant, and user-friendly solutions — and have the opportunity to grow your skills across multiple technologies. What you’ll do: Develop, maintain, and enhance applications using Angular and Flutter Support backend development with C#/.NET and SQL Design and implement RESTful APIs and integrate them with frontend applications Ensure application security, performance, and scalability Perform unit testing, debugging, and participate in code reviews Collaborate in Agile sprints, contributing to planning, development, testing, and deployment Work closely with the Product team to translate requirements into technical solutions Stay up to date with emerging technologies and suggest process improvements  What we’re looking for: 3+ years of software development experience Strong knowledge of Angular, Flutter, HTML, CSS, TypeScript, and JavaScript frameworks Experience with C#/.NET and SQL Server (plus NoSQL) Familiarity with Git and Agile methodologies Strong problem-solving skills and attention to detail Excellent communication and teamwork skills A proactive mindset and eagerness to learn new technologies Nice to have: Experience with Ionic or Cordova Knowledge of Azure or AWS cloud platforms Familiarity with Azure Functions, Azure DevOps, and CI/CD pipelines Experience with authentication frameworks (OAuth, JWT, IdentityServer) Interest in cross-platform development  What We Offer: Multisport co-financing Private medical care (plus additional coverage) Certification & language course support Weekly Lunch Tuesdays and Volleyball Thursdays Chill zone with a football table Integration events Collaborative, product-focused team Opportunity to grow with a fast-evolving tech company Involvement in meaningful projects used by real customers daily  Apply now and help us build innovative solutions that last!