Summary: Seeking a Mid-Level Full Stack Developer with React and .NET expertise to design, build, and maintain scalable web applications across the entire stack, collaborating with product, design, and engineering teams. Highlights: 1. Design, develop, and maintain full stack web applications using React and .NET 2. Contribute to the architecture of microservices and scalable backend systems 3. Collaborate in a vibrant team leveraging cutting-edge AI technologies 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 Mid\-Level Full Stack Developer with solid experience in React and .NET to help design, build, and maintain scalable, high\-quality web applications. You will work across the entire stack, from modern frontend interfaces to robust backend services, collaborating closely with product, design, and other engineering teams. **Responsibilities:*** Design, develop, and maintain full stack web applications using React, TypeScript, C\#, and .NET (preferably .NET Core/.NET 6\+) * Implement responsive and accessible user interfaces, following best practices in UI/UX and WCAG/ARIA standards * Build and maintain reusable frontend components and UI libraries for multiple business applications * Design and implement RESTful APIs, ensuring performance, scalability, and security * Contribute to the architecture of microservices and scalable backend systems * Write and maintain automated tests (unit, integration, API, and end\-to\-end) using tools such as Jest, React Testing Library, Playwright, and .NET testing frameworks * Collaborate with DevOps to configure and maintain CI/CD pipelines (preferably in Azure DevOps) * Work with cloud services (preferably Azure) for deployment, monitoring, and troubleshooting * Participate in code reviews, provide constructive feedback, and help maintain high engineering standards * Diagnose and resolve complex technical issues across the stack, optimizing performance and reliability **Requirements:*** Strong experience with React and TypeScript in modern frontend development * Experience building and maintaining reusable component libraries and working with tools such as Storybook * Solid understanding of JavaScript fundamentals and modern ES6\+ features and patterns * Experience with .NET (preferably .NET Core/.NET 6\+) and C\# for backend development * Experience designing and consuming RESTful APIs * Understanding of microservices architecture and scalable backend design * Experience with automated testing on both frontend and backend (unit tests, API tests, integration and/or E2E) * Experience with relational databases and database design concepts * Familiarity with cloud platforms (preferably Microsoft Azure) and cloud\-native development practices * Experience with CI/CD concepts and pipelines, ideally using Azure DevOps and YAML * Strong problem\-solving skills, attention to detail, and ability to work collaboratively in a cross\-functional team * Good communication skills in English (written and spoken) **Nice to Have:*** Experience with microfrontend architectures and modular frontend design * Experience with UI frameworks and styling libraries such as Chakra UI * Experience with Vite or other modern build tools and bundlers * Experience with Capacitor or similar tools for cross\-platform development * Knowledge of Clean Architecture and SOLID principles in both frontend and backend contexts * Experience with monitoring, logging, and observability tools in production environments At CI\&T, we are driven by Collaboration, Innovation, and Transformation. Join us to be part of a vibrant team that leverages cutting\-edge technologies, including AI, to create impactful solutions. We believe in fostering a culture of learning and growth, where your expertise can shine and make a difference. If you're ready to take your career to the next level, we encourage you to apply! **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.