Sr. Developer FullStack (.Net/React) , Brazil

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 aFullstack Developerwith a strong focus onfrontend development (70%)and solid backend skills(30%), working in a modern tech stack built on.NET8, C#, and React. You will build high-quality, scalable, and maintainable features across the full stack, collaborating closely with product, design, and engineering teams.

• Develop and maintain responsive, performant, and accessible user interfacesusingReact
• Implementreusable componentsfollowing best practices for scalability and maintainability
• Collaborate with UX/UI designers to translate designs into functional features
• Writeunit and integration testsfor frontend components
• Develop and maintainRESTful APIsand services using.NET8 and C#
• Implement business logic using theMediator pattern (MediatR)for clean and decoupled architecture
• UseAutoMapperfor efficient object-to-object mapping
• Implementasynchronous messagingwithRebusandAzure Service Bus
• Contribute to database design and queries usingPostgreSQLandMongoDB
• Writeunit testsusingxUnitand generate realistic test data withFaker (Bogus)
• Createtest doubles and mocksusingNSubstitute
• Work withAzure DevOpsfor project management, version control, and pipelines
• FollowGitFlowbranching strategy for organized and release-oriented development
• Contribute toAzure Pipelines(CI/CD) using YAML-based configurations
• Solid experience withReact(hooks, context, state management)
• Experience withcomponent-driven developmentand modern frontend architecture patterns
• Experience with.NET8 and C#for backend development
• Familiarity withMediatR, AutoMapper, and clean architecture principles
• Experience withmessaging/queueing systems(Rebus, Azure Service Bus, or equivalent)
• Experience withPostgreSQL— relational modeling and query optimization
• Experience withMongoDB— document-based modeling and aggregation
• Proficiency withEntity Framework Core (EF Core)
• xUnitfor unit and integration testing
• NSubstitutefor mocking and test doubles
• Faker / Bogusfor realistic test data generation
• Knowledge ofCQRScombined with MediatR
• Familiarity withDocker and containerization
• Exposure toAzure cloud services(App Services, Functions)
• Understanding ofDomain-Driven Design (DDD)principles
• Experience withmicro-frontend architecture

-Health and dental insurance

-Meal and food allowance

-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.