[Job-27376] Senior .Net Engineer

We are tech transformation specialists, uniting human expertise with AI to create scalable tech solutions.With over 8.000 CI&Ters around the world, we’ve built partnerships with more than 1,000 clients during our 30 years of history. Artificial Intelligence is our reality.  Position Overview: As a Senior Software Developer, you will work on the evolution and stability of a large- scale, mission-critical POS platform, combining modern C# .NET development with the maintenance of legacy components. This position focuses on SQL Server–driven systems, production reliability and real-world problem solving in high-availability environments. The onboarding phase will take place in CI&T's office in Brazil, with an estimated duration of 2 weeks. Therefore a valid passport and availability to travel abroad is required for this position. Key Responsibilities: ● Act as a key contributor to the support and evolution of applications built with C# .NET and SQL Server, interacting with legacy components when necessary, and contributing to the creation of innovative and robust solutions. ● Develop, debug, and optimize complex T-SQL stored procedures supporting critical business workflows. ● Maintain and enhance Windows Services and background processes integrated with external systems and hardware. ● Diagnose and resolve production issues in on-premises environments, ensuring operational continuity. ● Collaborate with product, support, and engineering teams to deliver reliable and scalable solutions. ● Contribute to modernization initiatives and continuous improvement of engineering practices. ● Continuously maintain and enhance existing systems, identifying opportunities for optimization and innovation. Must-Have Skills: ● SQL Server: Proficiency in SQL Server, including database design, query optimization, and data maintenance. Experience in evolving and maintaining queries and procedures. ● C# .NET Framework: Strong experience building and maintaining WinForms applications and Windows Services. ● Legacy Systems Exposure: Familiarity working with legacy codebases (including Visual Basic 6). ● GIT Repository: Experience using GIT for code versioning, including branching, merging, and conflict resolution. ● Clear and Effective Communication in English: Ability to convey information concisely and understandably, facilitating team collaboration and understanding with stakeholders. ● Proactivity and Autonomy: Ability to take the initiative in problem-solving and manage tasks independently, delivering results efficiently. Nice-to-Have Skills: ● Experience working with legacy systems and modernization efforts. ● Experience in supporting complex technical solutions ● Familiarity with COM/ActiveX integration. ● Cloud experience (Azure) or Infrastructure as Code (Terraform)., you will work on the evolution and stability of a large- scale, mission-critical POS platform, combining modern C# .NET development with the maintenance of legacy components. This position focuses on SQL Server–driven systems, production reliability and real-world problem solving in high-availability environments. The onboarding phase will take place in CI&T's office in Brazil, with an estimated duration of 2 weeks. Therefore a valid passport and availability to travel abroad is required for this position. Key Responsibilities: ● Act as a key contributor to the support and evolution of applications built with C# .NET and SQL Server, interacting with legacy components when necessary, and contributing to the creation of innovative and robust solutions. ● Develop, debug, and optimize complex T-SQL stored procedures supporting critical business workflows. ● Maintain and enhance Windows Services and background processes integrated with external systems and hardware. ● Diagnose and resolve production issues in on-premises environments, ensuring operational continuity. ● Collaborate with product, support, and engineering teams to deliver reliable and scalable solutions. ● Contribute to modernization initiatives and continuous improvement of engineering practices. ● Continuously maintain and enhance existing systems, identifying opportunities for optimization and innovation. Must-Have Skills: ● SQL Server: Proficiency in SQL Server, including database design, query optimization, and data maintenance. Experience in evolving and maintaining queries and procedures. ● C# .NET Framework: Strong experience building and maintaining WinForms applications and Windows Services. ● Legacy Systems Exposure: Familiarity working with legacy codebases (including Visual Basic 6). ● GIT Repository: Experience using GIT for code versioning, including branching, merging, and conflict resolution. ● Clear and Effective Communication in English: Ability to convey information concisely and understandably, facilitating team collaboration and understanding with stakeholders. ● Proactivity and Autonomy: Ability to take the initiative in problem-solving and manage tasks independently, delivering results efficiently. Nice-to-Have Skills: ● Experience working with legacy systems and modernization efforts. ● Experience in supporting complex technical solutions ● Familiarity with COM/ActiveX integration. ● Cloud experience (Azure) or Infrastructure as Code (Terraform).