[Job-32156] Senior .NET Backend Developer

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. At CI&T, we are looking for a skilled and motivated Senior .NET Backend Developer to join one of our delivery teams. You will design, build and evolve scalable, secure and maintainable backend services using a modern .NET stack, working closely with Product, Architecture, QA and Frontend colleagues in a collaborative, multicultural and fast-moving environment. Your responsibilities Design, develop and maintain RESTful APIs and backend services using C# and .NET 8+. Apply Clean Architecture, SOLID and KISS principles to keep code modular, reusable and simple. Build event-driven and asynchronous integrations using messaging platforms such as Azure Service Bus, RabbitMQ or Kafka. Model, query and optimize relational databases such as PostgreSQL and SQL Server, using Entity Framework Core. Work with document databases such as MongoDB, when needed. Implement secure authentication and authorization using OAuth2/OIDC and JWT. Write and maintain automated unit an