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Our Client is an international technology company developing advanced solutions for data protection, backup, and disaster recovery. The project focuses on building enterprise-class systems that help organizations worldwide protect their data, ensure business continuity, and counter threats such as ransomware. We are looking for an mid .NET Developer who wants to work on a stable product, solve real technical challenges, and have a tangible impact on the quality of the delivered software. WORK MODE: Gdańsk / Poznań / Wrocław / Kraków – 1 day per week in the office YOUR RESPONSIBILITIES: Developing new functionalities and maintaining backup and disaster recovery software in a .NET environment Analyzing technical issues and selecting optimal solutions with a focus on stability and data security Creating and maintaining unit tests to ensure high code quality and reliability Actively participating in code reviews, sharing knowledge and best practices within the team Preparing and maintaining technical documentation Collaborating closely with the project team in day-to-day product development REQUIREMENTS: Must-have: Minimum 3 years of experience in commercial software development At least 2 years of experience working with the .NET platform Very good knowledge of C# Good understanding of object-oriented programming principles (SOLID, DRY) Practical knowledge of design patterns Experience working with SQL and NoSQL databases Knowledge of Windows and Linux systems Ability to work with tools such as Git, Jira, and Docker Communicative level of Polish and English (international environment) Good work organization and strong teamwork skills Nice-to-have: Knowledge of Kubernetes, VMware, Hyper-V, S3 Storage, MS365, SignalR, TeamCity Experience with Android, iOS, and macOS systems Experience in low-level programming WHY JOIN? Work on a stable, globally developed product in the data security domain Real impact on software used by clients worldwide Collaboration with an experienced technical team in a friendly, partnership-based culture Opportunities to grow technical skills and work with modern technologies Benefits available on the TQLO side We will contact selected candidates only. TQLO Sp. z o.o. – Employment Agency, KRAZ No. 33580