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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 Senior .NET Engineer to join our team and drive the development and integration of complex back-end software solutions. You will work closely with a multicultural team distributed across Brazil, Colombia, the UK, and the USA, collaborating daily in English and contributing to robust, scalable services and integrations. Must-Have Skills: - .NET Experience: strong experience with .NET Framework and .NET Core in production systems. - Backend Development: hands-on experience building back-end services with C#, ADO.NET, and SQL Server. - APIs & Integration: solid experience implementing and evolving SOAP and RESTful services, including versioning and best practices. - Data & Persistence: strong understanding of ADO.NET, SQL Server, database design and performance tuning. - XML: proficiency in XML serialization/deserialization. - Software Design: solid grasp of software design patterns and engineering best practices. - Testing & Reliability: experience with unit and integration testing, troubleshooting and root-cause analysis for service reliability. - Communication: effective communication skills in multicultural, fast-paced environments. - Language: advanced English proficiency (all communication in English). Key Responsibilities - Design, build and maintain back-end services using C#, ADO.NET and SQL Server. - Implement and evolve SOAP and REST APIs, ensuring proper versioning, security and best-practice standards. - Ensure service reliability through unit and integration tests, troubleshooting, monitoring and root-cause analysis. - Collaborate on integration between multiple systems and services, applying appropriate software design patterns. - Conduct code reviews, provide technical feedback and mentor junior engineers. - Stay current with emerging technologies and industry trends, applying them to improve existing solutions. - Contribute to CI/CD workflows and best practices to increase development efficiency and deployment quality. Soft Skills - Ownership & Continuous Improvement: proactive in taking responsibility for tasks and driving improvements. - Communication: able to clearly explain complex technical topics to both technical and non-technical audiences. - Collaboration: team player who values shared success and cross-functional collaboration. - Adaptability: comfortable navigating ambiguity and shifting requirements in a dynamic environment. 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 deliver reliable, performant back-end services and integrations, help elevate engineering standards through reviews and mentorship, and collaborate smoothly across time zones and cultures using English as the primary language. If you are a seasoned back-end developer ready for complex challenges in a dynamic, multicultural environment, we invite you to apply and become part of our diverse team! #LI-THAI23 Our benefits include:   - Premium Healthcare - Meal voucher - Maternity and Parental leaves - Mobile services subsidy - Sick pay-Life insurance - CI&T University    - Colombian Holidays - Paid Vacations And many others.      Collaboration is our superpower, diversity unites us, and excellence is our standard.  We value diverse identities and life experiences, fostering a diverse, inclusive, and safe work environment. We encourage applications from diverse and underrepresented groups to our job positions.