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. we are looking for a Senior Fullstack Engineer to help evolve scalable solutions, expand business capabilities, and support the sustainable evolution of the platform. This person will contribute across both frontend and backend, helping design and build robust applications, improve system reliability and performance, and support long-term platform growth through technical excellence and collaboration. Responsibilities: Design, build, and evolve end-to-end solutions across Angular (15+) frontend and .NET (8/9) backend. Contribute to scalable solution design within a microservices, CQRS, and event-driven architecture environment. Develop and maintain robust user interfaces, backend services, and integrations that support performance, reliability, and business scalability. Support code quality, technical decisions, system observability, and engineering best practices across the full stack. Collaborate with cross-functional teams, contribute to architecture discussions, and act as a senior contributor through mentoring and technical guidance. Requirements for this challenge: Strong experience with Angular (15+) and TypeScript. Strong experience with C# and .NET, especially ASP.NET Core and .NET 8/9. Experience with microservices architecture, CQRS, and event-driven systems. Solid knowledge of REST APIs and frontend-backend integration patterns. Experience with authentication and authorization using OAuth2, OIDC, and MSAL. Experience with Microsoft Azure, especially Azure App Services, Azure Container Apps, Azure Service Bus, and Azure SQL. Familiarity with CI/CD pipelines using Azure DevOps. Experience with Docker and cloud-native deployment practices. Hands-on experience with Entity Framework Core (EF Core). Strong troubleshooting and debugging skills across frontend and backend. Ability to influence technical decisions and mentor other engineers. Advanced English. Differentials: Experience with micro-frontends and shared libraries. Familiarity with Application Insights and OpenTelemetry. Experience with performance optimization and SLO / SLA practices. Exposure to Domain-Driven Design (DDD) and architecture-driven development. 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.