Remote Senior Backend Developer

O projekcie: Be part of SIENN — a company that values innovation, teamwork, and continuous learning. Work with experienced professionals on meaningful projects and expand your skills in a supportive international environment. What we offer: - B2B rate: up to 140 PLN/h - Work in an international project environment - Access to international training and certifications (e.g. Microsoft MCP) - Opportunities for professional development and knowledge sharing - Possibility to access optional benefit platforms (medical care, sports card, insurance, language courses) - Collaborative and supportive project environment Wymagania: Required skills & experience - Advanced experience with MS SQL Server (T-SQL), including stored procedures, functions, and error handling - Strong background in .NET backend development - Proficiency in C# - Hands-on experience with the Azure environment - Familiarity with Azure DevOps - Ability to write clean, maintainable, and well-documented code - Understanding of deployment processes and release pipelines - Openness to and experience with AI-assisted development tools - Strong problem-solving skills and attention to detail - Proficiency in English (spoken and written) - Proactive and self-driven mindset Nice to have: - Experience with Supabase (PostgreSQL) Soft skills: - Openness in communication within an international team, including constructive challenge and initiative-taking - Proactive attitude and willingness to take ownership - Ability to collaborate effectively in a distributed, multicultural environment Codzienne zadania: - As a Backend Developer, you will be responsible for driving backend project ownership, delivering second-level support, and actively promoting continuous improvements across systems, processes, and code quality. This role involves managing both legacy and modern projects while working independently within a small team environment. The ideal candidate is a proactive problem solver, adaptable across diverse systems and technologies, and thrives in dynamic, multi-project settings.