Senior Full Stack MERN Developer
We are a U.S.-based SaaS startup looking for a Senior Full Stack MERN Developer to work directly with our hands‑on CTO. This is a senior role for someone who can ship features, improve architecture, enforce clean‑code practices, and scale an MVP into a production‑grade SaaS platform.
We prioritise candidates based in Argentina or Brazil to align with U.S. West Coast (Los Angeles) working hours.
What You’ll Do
Take ownership of an existing MERN MVP and evolve it into a scalable, production‑ready product
Refactor and improve messy or inefficient code for clarity, maintainability, and performance
Debug and resolve complex cross‑layer issues quickly (MongoDB, Node.js, React, CI/CD)
Design and optimise MongoDB schemas, indexes, Atlas Search, and triggers
Build event‑driven workflows with MongoDB triggers
Integrate AI/LLM services (OpenAI, AWS Comprehend, embeddings, NLP features) into production apps
Support and improve Twilio‑based messaging and webhook integrations
Contribute to new product features end‑to‑end (backend + frontend)
Requirements
Expert in MERN stack: MongoDB, Express.js, React.js, Node.js
Deep MongoDB knowledge (indexes, performance, aggregation, triggers)
Strong backend/infrastructure 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
Direct collaboration with a technical founder/CTO
Long‑term role solving real production challenges (not just CRUD apps)
Remote role with U.S. time zone collaboration
Opportunity to grow into a lead role as the team expands
Seniority level: Mid‑Senior level
Employment type: Contract
Job function: IT Services and IT Consulting
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