About FullStack

FullStack is your AI-native engineering partner, built to turn AI capability into certainty. Most companies can demo AI; few can get it to production and prove what it produced. We close that gap with three capabilities — AI built into your products from the start, elite vetted talent who apply it, and transparent execution that shows value every step of the way. With now over 600 customers in North America, FullStack is one integrated partner for all your AI engineering needs. With Fullstack, you move forward with confidence.

We’re Most Proud Of

- Offering life-changing career opportunities to talented software professionals across the Americas.
- Building highly-skilled software development teams for hundreds of the world’s greatest companies.
- Having delivered hundreds of successful custom software solutions, which have positively impacted the lives and careers of millions of users.
- Our 4.1-star rating on GlassDoor.
- Our client Net Promoter Score of 68, twice the industry average.

The Position

We're looking to hire an Agentic Software Engineer (OpenAI Codex) to join our team. You'll work with one of our incredible product teams to build and deliver a product to our clients.

What We're Looking For

- 5+ years of professional software development experience with a deep understanding of full-stack architectures (e.g., Java, Python, C#, React, Node, etc.).
- Advanced English is required.
- Successful completion of a four-year college degree is required.
- Deep experience using OpenAI Codex as a primary development environment to coordinate AI-driven implementation across large,



multi-file systems while maintaining architectural oversight.
- Experience delivering production software where AI systems generate the majority of implementation code.
- Strong context engineering skills, including structuring codebases, specifications, and documentation to produce reliable, context-efficient AI output.
- Ability to translate complex product requirements into machine-executable, AI-friendly specifications.
- Experience designing AI-first development workflows from specification through deployment.
- Ability to systematically improve AI-generated output through structured iteration and feedback loops.
- Comfort working across multiple stacks, using AI to deliver high-quality, production-ready systems.
- Experience operating across frontend, backend, and infrastructure in AI-accelerated environments.
- Disciplined human-in-the-loop review practices, with risk-adjusted validation for high-impact or safety-critical flows.
- Strong curiosity and initiative in evaluating and adopting emerging AI-native engineering practices.
- Advanced understanding of Agile methodologies and Lean principles and participation in team ceremonies as well as asynchronous work.
- Ability to work through new and difficult issues and contribute to libraries as needed.




- Ability to create and maintain continuous integration and delivery of applications.
- Forensic attention to detail.
- A positive mindset and a can-do attitude.
- Experience working on Agile / Scrum teams.
- Meaningful experience working on large, complex systems.
- Ability to take extreme ownership over your work. Every day is a challenge to ensure you are performing to the expectations you and your team have agreed upon.
- Ability to identify with the goals of FullStack's clients, and dedicate yourself to delivering on the commitments you and your team make to them.
- Ability to consistently work 40 hours per week.

Work Authorization Requirements

- Applicants must be currently authorized to work in the country of this job posting on a full-time basis.
- FullStack will not sponsor applicants for work visas now or in the future.

What We Offer

- Competitive Salary.
- Paid Time Off (vacation, sick leave, parental leave, and holidays)
- 100% remote work.
- The ability to work with leading startups and Fortune 500 companies.
- Health policy with Sura 100% for you and up to 4 primary family members.
- English Classes.
- Food card.
- Ample opportunity for career advancement.
- Continuing education opportunities.

FullStack is proud to be an equal opportunity workplace. We are committed to equal employment opportunity regardless of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability, gender identity, or Veteran status.

Learn more about our Applicants Privacy Notice.

📌 Agentic Software Engineer (OpenAI Codex) - Remote - Colombia (Cúcuta)
🏢 FullStack
📍 Cúcuta