Senior Full-Stack Developer (.NET / Node.js / Java / React), Brazil

We are **tech transformation** specialists, uniting human expertise with AI to create scalable tech solutions. With over 7,400 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.  At CI\&T, we are seeking a highly skilled and motivated Senior Full\-Stack Developer to join our team in Brazil. You will contribute to an innovative project in a collaborative, transforming, and multicultural environment, driven by our commitment to Collaboration, Innovation, and Transformation. **Position Overview: As a Senior Full\-Stack Developer, you will lead the migration of a Node (Express) application into a .NET framework, creating like\-for\-like API endpoints while converting logic from stored procedures to code using the Dapper ORM. You will be part of a dynamic team that emphasizes high\-quality deliverables, working closely with cross\-functional teams to ensure client expectations are not just met, but exceeded. **Key Responsibilities:** * Migrate legacy .NET and SQL\-based systems to modern services and APIs (Java / Node.js) * Develop and maintain backend logic, ETL data services, and frontend components using React * Collaborate with QA teams to integrate Postman test collections and Playwright automation scripts * Support both manual and automated testing workflows, including complex “lot\-to\-subdivision” validation flows * Participate in pipeline design and data synchronization across multiple environments * Optimize and troubleshoot database queries and performance issues * Leverage Copilot / AI\-assisted development to accelerate delivery where appropriate **Must\-have Skills:** * Proven years of experience as a Full Stack Developer * Strong proficiency with Java, React, and SQL * Working experience with .NET and Node.js backends * Familiarity with ETL processes, data migrations, and API integrations * Experience with Airflow, DBT, or similar data orchestration tools is a plus * Exposure to Snowflake or Postgres environments preferred * Comfortable collaborating with QA teams and integrating test automation frameworks (Postman, Playwright) * Strong communication skills and a proactive problem\-solving mindset * Experience or interest in using GitHub Copilot or similar AI\-assisted tools **Nice\-to\-have Skills:** * Familiarity with Agile methodologies * Knowledge of cloud platforms (AWS, Azure) * Experience in mentoring junior developers Join us at CI\&T, where your expertise will directly impact our innovative projects. We are driven by the power of AI and the desire to transform the digital landscape. If you are ready to collaborate in a forward\-thinking environment, we want to hear from you! **Our benefits include: \- Premium Healthcare \- Meal voucher \- Maternity and Parental leaves \- Mobile services subsidy \- Sick pay\-Life insurance \- CI\&T University    \- Colombian Holidays \- Paid Vacations And many others.  Collaboration is our superpower, diversity unites us, and excellence is our standard.  We value diverse identities and life experiences, fostering a diverse, inclusive, and safe work environment. We encourage applications from diverse and underrepresented groups to our job positions.****