Empresa: CI&T
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: -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.