Job Summary: Full Stack Developer with a Backend focus (Node.js) to build services and business rules, and to model and deploy robust, scalable solutions. Key Highlights: 1. Work on the core development of LíneaPay 2. Participate in architectural and system structure decisions 3. Ensure best practices in security, testing, and versioning **Senior Full Stack Developer – Backend (Node.js)** ---------------------------------------------------- **On-site – Location: Ribeirão Preto/SP** ------------------------------------------ Job Description Full Stack Developer with a Backend focus (Node.js) to work on the core development of LíneaPay. Will participate in building platform services, business rules, and integrations, from modeling through to production deployment. Close collaboration with frontend and product teams will be essential to ensure a robust, secure, and scalable solution. Solve complex problems and build solid systems. Responsibilities * Develop APIs and services using Node.js * Implement and maintain business rules * Build integrations with external services and payment gateways * Model and work with databases * Participate in architectural and system structure decisions * Ensure best practices in security, testing, and versioning Requirements and Qualifications * Solid experience with Node.js * Experience as a full stack developer * Creation and consumption of REST APIs * Experience with SQL and/or NoSQL databases * Proficiency with Git and software development best practices * Familiarity with AWS environments (S3, Lambda, API Gateway) or equivalents. Desirable Differentiators * Experience with financial systems or recurring billing * Knowledge of cloud platforms (AWS, GCP or similar) * Experience working on SaaS products or startups * Experience with production environments and scalability