Job Summary: We are looking for an analytical and proactive professional to support and develop self-service systems, collaborating with product, support, and infrastructure teams. Key Highlights: 1. Transform your career by joining a team that values innovation and collaboration. 2. Independently tackle complex technical problems. 3. Join a team that recognizes and values your talent and potential. If you seek to transform your career and join a team that values innovation, collaboration, and continuous development, this is the ideal opportunity! We are seeking professionals who bring experience, passion, and a desire to grow. If you have knowledge of the Retail, POS (Point of Sale), and Food Service sectors’ dynamics and particularities, now is your time to shine. We seek an analytical, proactive individual capable of independently resolving more complex technical problems while directly collaborating with product, support, and infrastructure teams. If you enjoy diving deep into customer issues, negotiating solutions with developers, and ensuring alignment across the entire company, this role is for you. **Responsibilities and Duties** * Maintain the self-service system, ensuring stability and high availability. * Investigate and resolve complex production technical issues. * Implement performance improvements and optimizations on frontend and backend. * Develop and evolve new features according to the product roadmap. * Integrate and maintain REST APIs. * Work with queues and topics for asynchronous processing. * Perform database maintenance and optimization (SQL and SQLite). * Collaborate with product, QA, and support teams to identify and resolve incidents. * Ensure adherence to best development practices, version control, and documentation. * Participate in code reviews and technical discussions. **Requirements and Qualifications** * Experience with JavaScript (Frontend) and Python (Backend); * Experience with REST APIs, Queues, and Topics; * SQL, SQLite; **Additional Information** **Benefits: Caring for You and Your Growth** **Meal allowance**: R$704.00 per month; **Life insurance**: fully covered by the company; **Health insurance**: 70% covered by the company based on employee’s age; for dependents under the Health Plan, 100% employee-paid, based on age. **Dental insurance**: fully covered by the company. **Transportation allowance (VT)**: provided as needed (deduction up to 6% of salary); **Birthday gift card** (freely usable balance). **Join a team that values your talent and potential in every sense!** Come help us transform the restaurant customer service experience across Brazil. Together, let’s build a future that is even more digital, practical, and innovative! All our positions are open and inclusive for People with Disabilities (PwDs). **If this resonates with you, apply now and join our phenomenal team!** * If you feel you don’t meet all the requirements for this position, we still encourage you to apply. We know confidence gaps and imposter syndrome can prevent amazing candidates from pursuing their dream roles—and we don’t want that to happen to you. Founded in 2006, 3S Checkout is a Brazilian technology company specializing in developing innovative enterprise management solutions, with a focus on retail. With a highly qualified team, we offer services ranging from retail-specific solutions to fully customized web and mobile solution development and maintenance. We serve large-scale clients, delivering comprehensive and innovative solutions. Commitment and agility in serving our clients drive everything we do. Certified by Great Place to Work (GPTW), we are a company focused on developing our employees and believe that innovative actions are driven by innovative people—those with collaborative mindsets, intellectual curiosity, and an owner’s attitude. Join the digital transformation journey with 3S Checkout