Tech6 Group has 28 years of experience in the market, delivering national and international projects and developing robust, scalable solutions for diverse sectors. We are looking for a Mid-Level Full Stack Developer to work on the development and evolution of a platform used by thousands of users in the United States, with a focus on React for the front-end and .NET for the back-end. This position is intended for professionals who already work in production environments, possess solid technical confidence to handle end-to-end responsibilities, and aim to consistently contribute to application evolution within a live product context. **Your day-to-day responsibilities** * Develop new features and enhance front-end (React) and back-end (.NET) applications * Design and consume REST APIs * Work with relational databases, performing queries, adjustments, and optimizations * Participate in code reviews to ensure code quality, standardization, and maintainability * Collaborate with other developers, product teams, and partner areas * Address bugs and continuously improve applications * Follow software development best practices to ensure sustainable, reliable code **Tech stack and technologies used** * Front-end: React * Back-end: C# / .NET * APIs: REST * Database: SQL Server * Code versioning: Git **Mandatory requirements** * Practical experience as a Full Stack Developer * Real-world project experience with React * Experience with C# and .NET * Knowledge of REST API development and consumption * Experience with relational databases * Familiarity with Git * Strong communication skills and ability to work effectively in a team **Nice-to-have (non-eliminatory)** * Experience with automated testing * Knowledge of CI/CD * Experience with cloud platforms (Azure or AWS) * Familiarity with architectural best practices and clean code principles **About the project** You will join an international project targeting the U.S. market, working on a platform already in production and used daily by thousands of people. This means: * Code with real-world impact * Focus on stability and continuous evolution * Technical decisions aligned with an operational product **What you’ll find here** * A technically strong and collaborative environment * Ongoing knowledge sharing * Clear expectations regarding your role * Real-world projects with consistent challenges and technical responsibility appropriate for a mid-level professional **Work model** Hybrid — Florianópolis/SC Location: Square SC – Saco Grande Schedule: 08:00 to 17:00 If you are already a mid-level developer with hands-on experience in React and .NET and are seeking an international, stable project with tangible impact, we’d love to meet you.