Founding AI-Driven Full-Stack Developer, Fintech Platform

Post Oak Group; Argentina; Remote; ARS 2,000,000 - 4,000,000; Full time

Job summary

Post Oak Group is seeking an experienced full-stack developer to lead the project from concept through deployment for a fintech platform. The role emphasizes using AI-assisted tools like OpenAI Codex to accelerate progress while maintaining code quality, security, and reliability.

You will design intuitive UIs, build backend systems and APIs, and integrate external services across web and mobile apps (iOS and Android). Strong ownership and US Central Time overlap are expected.

Qualifications

• Strong experience in full-stack development across frontend and backend.
• Proficiency with React, Next.js, Node.js, and TypeScript.
• Experience with React Native or similar cross-platform mobile framework.
• Familiarity with AI-assisted development tools such as Codex, Claude Code, or Cursor.

Responsibilities

• Lead end-to-end development of web and mobile apps (iOS/Android).
• Design responsive, intuitive user interfaces.
• Build and maintain backend systems, databases, auth and APIs.
• Integrate third‑party APIs and external services.
• Leverage AI coding tools to speed up development and improve quality.
• Ensure security, testing, monitoring and deployment best practices.
• Own priorities, timelines and deliverables with leadership.

Skills

Full-stack development

Frontend: React/Next.js/TypeScript

Backend: Node.js & APIs

React Native / cross-platform mobile

AI-assisted development tooling

Education

Bachelor’s degree in CS or related field

Tools

OpenAI Codex

Claude Code

Cursor

Job description

Post Oak Group is seeking an experienced full-stack developer to lead the project from concept through deployment for a fintech platform. The role emphasizes using AI-assisted tools like OpenAI Codex to accelerate progress while maintaining code quality, security, and reliability.

You will design intuitive UIs, build backend systems and APIs, and integrate external services across web and mobile apps (iOS and Android). Strong ownership and US Central Time overlap are expected.