Remote Senior Full-Stack Engineer: Next.js, TS & AI

GoFasti; United States; Remote; USD 33,000 - 36,000; Full time

Job summary

GoFasti is a remote-first talent-as-a-service company connecting LatAm developers with global clients. We seek a Senior Full-Stack Software Engineer, based in Latin America, to work remotely on a TypeScript/Node backend and Next.js frontend with fintech data workflows.

You will engage in security-centric development, on-call ownership, and continuous learning in a fast-changing environment. The role emphasizes strong communication, proactive collaboration, and the ability to review AI-assisted

Qualifications

• 6+ years as a software engineer with 3+ years shipping production TS/Node backends.
• Experience with payments or fintech data securely (Plaid, Stripe, etc.).
• Deep PostgreSQL with migrations, indexes, transactions, and query plans.
• Security-first approach to PII, encryption at rest, and least privilege.

Responsibilities

• Maintain a TypeScript monorepo with Next.js web app, API, Expo app, and Cloudflare Worker.
• Manage shared PostgreSQL models and migrations across apps.
• Handle webhook integrations, queued jobs, and background processing.
• Ensure secure handling of tokens and per-user data scope across web and mobile.
• Develop AI layer features: tool-calling, memory, and proactive insights.
• Review AI-generated code for quality and security.

Skills

TypeScript/Node

Backend development

SQL/PostgreSQL

Security-focused coding

On-call ownership

Tools

Next.js

React

Prisma

Cloudflare Worker

Job description

GoFasti is a remote-first talent-as-a-service company connecting LatAm developers with global clients. We seek a Senior Full-Stack Software Engineer, based in Latin America, to work remotely on a TypeScript/Node backend and Next.js frontend with fintech data workflows.

You will engage in security-centric development, on-call ownership, and continuous learning in a fast-changing environment. The role emphasizes strong communication, proactive collaboration, and the ability to review AI-assisted