At 4U EdTech, we believe in the transformative power of education. With our innovative approach, we are redefining learning and opening new paths for the future. We are looking for a talented and motivated Fullstack Developer II to join our team! If you are passionate about connecting people, providing support, and want to take the next step in your career within a dynamic and innovative environment, this is the perfect opportunity for you. **Your responsibilities:** Develop and maintain back-end applications in Node.js and front-end using modern frameworks (React, Vue, or similar); Integrate RESTful APIs and WebSockets between internal and external services; Implement authentication, authorization, and security best practices; Participate in the architecture and modeling of relational and non-relational databases (MySQL, MongoDB, etc.); Collaborate with product and design teams in defining features and interfaces; Perform code reviews, testing, and deployments in production environments; Contribute to the continuous improvement of development processes and infrastructure. **Requirements:** Completed or ongoing degree in Computer Science, Software Engineering, Systems Analysis and Development, or related fields; Solid knowledge of Node.js (Express, NestJS, or similar frameworks); Proficiency in JavaScript/TypeScript, HTML5, CSS3, and front-end frameworks (React, Vue, Angular, etc.); Experience with relational and non-relational databases; Knowledge of version control (Git) and CI/CD best practices; Understanding of API architecture, REST, and microservices; Experience integrating payment platforms (Pagar.me, GetNet, MercadoPago); Experience with educational platforms (LMS, e-learning) will be a plus; Knowledge of Artificial Intelligence (AI) solutions, especially using generative model APIs, automations, or intelligent assistants, will be considered a significant advantage. **What we offer:** Meal allowance/food benefit (35 BRL per day); 100% scholarship for Public Exam preparation courses or Financial Certification \+ 3 additional scholarships per year to gift to friends or family; Soft drinks available at the office for hybrid work schedule; Free fruits at the office for hybrid work schedule; Wellhub (formerly Gympass); Birthday day off and reward day off (Refer a friend); Ping pong table, arcade games, and bean bags for comfort and relaxation during breaks; Unimed health and dental insurance (with only 1 BRL deducted from paycheck) after probation period; Inclusive and relaxed work environment.