[Job - 31359]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 a Fullstack Developer with a strong focus on frontend development (70%) and solid backend skills (30%), working in a modern tech stack built on .NET 8, C#, and React. You will build high-quality, scalable, and maintainable features across the full stack, collaborating closely with product, design, and engineering teams.

Requisitos:

• Develop and maintain responsive, performant, and accessible user interfaces using React
• Implement reusable components following best practices for scalability and maintainability
• Collaborate with UX/UI designers to translate designs into functional features
• Ensure cross-browser compatibility and performance optimization
• Write unit and integration tests for frontend components
• Develop and maintain RESTful APIs and services using .NET 8 and C#
• Implement business logic using the Mediator pattern (MediatR) for clean and decoupled architecture
• Use AutoMapper for efficient object-to-object mapping
• Implement asynchronous messaging with Rebus and Azure Service Bus
• Contribute to database design and queries using PostgreSQL and MongoDB
• Write unit tests using xUnit and generate realistic test data with Faker (Bogus)
• Create test doubles and mocks using NSubstitute
• Participate in code reviews to uphold code quality standards
• Work with Azure DevOps for project management, version control, and pipelines
• Follow GitFlow branching strategy for organized and release-oriented development
• Contribute to Azure Pipelines (CI/CD) using YAML-based configurations
• Solid experience with React (hooks, context, state management)
• Proficiency in JavaScript / TypeScript
• Experience with component-driven development and modern frontend architecture patterns
• Experience with .NET 8 and C# for backend development
• Familiarity with MediatR, AutoMapper, and clean architecture principles
• Experience with messaging/queueing systems (Rebus, Azure Service Bus, or equivalent)
• Experience with PostgreSQL — relational modeling and query optimization
• Experience with MongoDB — document-based modeling and aggregation
• Proficiency with Entity Framework Core (EF Core)
• xUnit for unit and integration testing
• NSubstitute for mocking and test doubles
• Faker / Bogus for realistic test data generation
• Azure DevOps, Git, GitFlow, Azure Pipelines, Azure Service Bus

Diferenciais: 

• Knowledge of CQRS combined with MediatR
• Familiarity with Docker and containerization
• Exposure to Azure cloud services (App Services, Functions)
• Understanding of Domain-Driven Design (DDD) principles
• Experience with micro-frontend architecture

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