Senior Full Stack Developer, Node + React

This Senior Full Stack Developer role is for a MERN developer to join a U.S.-based SaaS startup. The role involves building and scaling a production-ready SaaS platform, improving code quality, and integrating AI/LLM services. It's a contract position prioritizing candidates based in Argentina or Brazil, aligning with US West Coast working hours.

Requirements

• Expert in MERN stack: MongoDB, Express.js, React.js, Node.js
• Deep MongoDB knowledge (indexes, performance, aggregation, triggers)
• Strong backend/infra skills: Node.js async/memory, AWS (EC2, S3, Lambda), CI/CD pipelines
• Experience integrating AI services into production apps
• Excellent English communication (mandatory)
• Availability during U.S. West Coast working hours (PST/PDT)
• Based in Argentina or Brazil

Benefits

• Long-term role solving real production challenges
• Remote role with U.S. time zone collaboration
• Opportunity to grow into a lead role