Job Summary: Senior Full Stack Developer to drive the technical evolution of an international production platform, requiring technical maturity and a systemic perspective. Key Highlights: 1. Technical evolution of a platform used by thousands of users in the U.S. 2. Autonomous work, impact analysis, and technical decision-making 3. Collaboration in code reviews and contribution to continuous improvement Tech6 Group has 28 years of market experience, delivering national and international projects and building robust, scalable solutions across diverse sectors. We are seeking a Senior Full Stack Developer to drive the technical evolution of a production platform used daily by thousands of users in the United States. This role is intended for professionals with technical maturity—capable of working autonomously, analyzing impacts, supporting technical decisions, and actively contributing to product quality, stability, and evolution. **Your day-to-day responsibilities** * Develop and enhance front-end (React) and back-end (.NET) features in production environments * Design, consume, and improve REST APIs * Work with relational databases, performing queries, adjustments, and optimizations * Actively analyze and resolve production issues * Participate in and contribute technically to code reviews, promoting best practices and code quality * Collaborate with other developers, product teams, and partner areas to support technical decisions * Contribute to the application’s continuous evolution with a long-term perspective **Mandatory Requirements** * Practical experience as a Full Stack Developer * Real-world React experience * Experience with C# and .NET * Knowledge of REST API development and consumption * Experience with relational databases * Knowledge of 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 work on an international project targeting the U.S. market—a mature, production-ready platform with high daily usage. This means: * Technical decisions directly impacting the product * Responsibility for system stability, quality, and evolution * Work in a context demanding technical maturity and a systemic perspective Work model: Hybrid, based in Florianópolis. On-site attendance occurs on days coordinated with the team (approximately 1–2 times per week). If you are already a senior developer with solid experience in React and .NET, and you seek a real, stable project with consistent technical challenges, we’d love to meet you.