[Job - 31610] Master .NET Specialist, Brazil

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At CI&T, we help large enterprises transform the potential of AI into real business impact with AI Deployment, AI-native execution, and tech-integrated business solutions. With 30 years of experience in technological transformation, we accelerate innovation with expertise in Agentic SDLC, Application modernization, Data & AI, Martech and Business strategy. We are 8,000 CI&Ters across more than 25 countries, collaborating to build solutions with real impact. AI is already part of how we work, evolve, and innovate every day. We are looking for a Master .NET Specialist to lead the development and integration of complex back-end software solutions. In this role, you will work closely with a multicultural team distributed across Brazil, Colombia, the UK, and the USA, collaborating daily in English and setting technical direction for robust, scalable services and integrations. Must-Have Skills: .NET Expertise: extensive experience with .NET Framework and .NET Core in high-volume, production systems. Backend Development: advanced hands-on experience designing and building back-end services using C#, ADO.NET, and SQL Server. APIs & Integration: strong background implementing and evolving SOAP and RESTful services, including versioning, security, and best practices. Data & Persistence: deep understanding of ADO.NET and SQL Server, including database design, optimization, and performance tuning. XML: proficiency in XML serialization/deserialization for integrations and data exchange. Software Design: strong command of software design patterns, clean architecture principles, and engineering best practices. Testing & Reliability: experience designing unit and integration tests, troubleshooting complex issues, and performing root-cause analysis to ensure reliability. Communication: effective communication skills and resilience in fast-paced, multicultural teams. Language: advanced English proficiency (all communication conducted in English). Key Responsibilities: Design, build, and maintain complex back-end services in C#, ADO.NET, and SQL Server. Implement and evolve SOAP and REST APIs, ensuring consistent standards for versioning, security, performance, and documentation. Ensure service reliability through unit and integration testing, proactive troubleshooting, and root-cause analysis of production incidents. Collaborate on integrations between multiple systems and services, applying appropriate software design patterns and architectural principles. Conduct code reviews and provide mentorship and technical guidance to junior and mid-level engineers. Stay up to date with emerging technologies and industry trends, recommending and applying improvements to existing solutions. Contribute to CI/CD workflows and best practices to enhance development efficiency, quality, and deployment consistency. Soft Skills: Ownership & Continuous Improvement: proactive approach to taking responsibility, improving processes, and raising engineering standards. Communication: strong ability to communicate clearly with both technical and non-technical audiences, across cultures and time zones. Collaboration: team player who values shared success and constructive feedback. Adaptability: comfortable dealing with ambiguity, changing priorities, and evolving requirements. Nice-to-Have Skills: Cloud: experience with cloud platforms, preferably Microsoft Azure. Modern Practices: familiarity with specification-driven development and agentic approaches to software development. Agile: exposure to Agile methodologies (Scrum, Kanban, etc.). The successful candidate will be a technical reference for the .NET stack, delivering reliable, performant back-end services and integrations while mentoring the team and improving our engineering practices. You will help the team navigate complexity, ensuring that solutions are scalable, maintainable, and aligned with business goals. If you are a seasoned back-end developer ready to take on complex challenges in a dynamic, multicultural environment, we invite you to apply and become part of our diverse team! #LI-THAI23 Our benefits:   -Health and dental insurance -Meal and food allowance -Childcare assistance -Extended paternity leave -Partnership with gyms and health and wellness professionals via Wellhub (Gympass) TotalPass; -Profit Sharing and Results Participation (PLR); -Life insurance -Continuous learning platform (CI&T University); -Discount club -Free online platform dedicated to physical, mental, and overall well-being -Pregnancy and responsible parenting course -Partnerships with online learning platforms -Language learning platform And many more!   More details about our benefits here: https://ciandt.com/br/pt-br/carreiras   At CI&T, inclusion starts at the first contact. If you are a person with a disability, it is important to present your assessment during the selection process. See which data needs to be included in the report by clicking here.This way, we can ensure the support and accommodations that you deserve. If you do not yet have the assessment, don't worry: we can support you in obtaining it.   We have a dedicated Health and Well-being team, inclusion specialists, and affinity groups who will be with you at every stage. Count on us to make this journey side by side.