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Senior Full Stack Developer - .NET/Angular/React - SaaS/Cloud Applications Location: Warsaw, Poland (Hybrid or Remote flexibility) Start Date: ASAP Contract Type: Long-term contract 6-12 months initial + extensions Industry: Technology/SaaS/Enterprise Solutions We are currently seeking a Senior Full Stack Developer to join a growing digital team working on large-scale, enterprise-grade web applications and SaaS platforms. You'll play a critical role in designing, building, and enhancing modern cloud-native solutions using the latest technologies in the Microsoft stack. This is an excellent opportunity for a skilled and passionate developer to be part of an Agile, collaborative environment with strong growth potential and exposure to global delivery teams. Key Responsibilities: Design and develop robust, scalable features for both new and existing web-based applications Lead R&D efforts on new technologies, libraries, and design patterns Rapidly prototype features and contribute to proof-of-concepts Review code, share knowledge, and mentor junior developers Fix bugs and implement performance improvements across the stack Collaborate closely with global product owners, testers, and business analysts in Agile teams Support business and end-users with technical queries and solution walk-throughs Ensure high coding standards and best practices across development processes Participate in daily stand-ups, planning, grooming sessions, and team demos Essential Skills & Experience: 5+ years of professional software development experience Degree in Computer Science, Engineering, or related technical field Proven experience building large-scale web applications and SaaS platforms Strong proficiency in C# and .NET Core Expertise in TypeScript and Front End frameworks: Angular (13+) or React Solid background in MS SQL/SQL Azure , Entity Framework (EF 6/EF Core) Familiarity with Azure tools : KeyVault, Blob Storage, Queues, etc. Experience with MongoDB or other NoSQL databases Strong knowledge of unit testing frameworks: NUnit , Moq , or Jest Proficient with Git/SVN and collaboration tools: Azure DevOps , Jira , Asana Experience developing and deploying cloud-based applications on Azure , AWS , or GCP Nice to Have: Experience or interest in business analytics and BI tools: Power BI Azure Analysis Services Tableau Anaplan Background in Agile environments with fast-paced delivery cycles Soft Skills: Strong communication skills (verbal and written) Ability to work independently and as part of a globally distributed team Self-driven with a passion for innovation and continuous improvement This role offers long-term potential, interesting tech challenges, and the opportunity to work on cutting-edge web and cloud applications. If you're ready to elevate your career in a collaborative environment where quality and creativity are valued, we'd love to hear from you.