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Senior C# Backend Developer at Workana. Workana is the largest remote work platform for talents in Latin America. Our new segment, Workana Premium, focuses on matching the most exceptional professionals with leading and innovative companies around the globe. Enjoy competitive compensation, dedicated support, and the flexibility of remote work within a dynamic environment that fosters collaboration and professional advancement.. We are proud to present you with the following opportunity.. Role Overview:. We are looking for a . Senior C# Backend Developer. to join an innovative team working on high-performance Windows desktop applications. This is a hands-on technical role focused on building robust, modern systems with a focus on API integration, user interface design, and application performance optimization. You’ll collaborate closely with the tech lead and cross-functional teams to deliver high-quality solutions that are efficient, scalable, and maintainable.. Responsibilities:. . Develop reliable and maintainable systems using C#. . . Design and implement API integrations (RESTful, SOAP, JSON, XML). . . Build modern, responsive user interfaces using jQuery and best UI/UX design practices. . . Apply multithreading and asynchronous programming techniques to enhance application performance. . . Contribute to architecture and creative design discussions. . . Ensure code quality, maintainability, and adherence to best practices. . . Implement secure REST APIs with authentication/authorization (OAuth2) and security best practices. . . . 5+ years of experience in software development with C#. . . Solid experience with API integrations (REST, SOAP, JSON, XML). . . Skilled in frontend development with jQuery. . . Proficiency in multithreading and asynchronous programming. . . Knowledge of Microsoft SQL Server, including schema design, T-SQL, stored procedures, and indexing. . . Experience with Entity Framework or ADO.NET (C#).. . Hands-on experience building secure REST APIs following best practices. . . . Must be based in Brazil.. . . Company Location: Brazil.