Agentic Software Engineer (OpenAI Codex) - Remote - Latin America - #663309

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 Opportunity

Join our talent network and connect with U.S. clients for flexible, project-based development work as an Agentic Software Engineer (OpenAI Codex-focused).

• You will integrate directly into our client's team and work alongside their existing designers and engineers on a daily basis.
  
  

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.).
• 1-3 years of professional experience with AI-assisted engineering workflows and agentic AI tools (e.g., Cursor, Claude Code, Copilot) to accelerate delivery.
• 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 pay.
• 100% remote work.
• The ability to work with leading startups and Fortune 500 companies.
• Continuing education opportunities.
• Opportunity to grow and expand your career.
  
  

Our talent network is committed to fostering a diverse, inclusive, and accessible environment where IT professionals can find opportunities that match their skills. We welcome individuals of all races, religions, genders, sexual orientations, national origins, abilities, and experiences. Our focus is on connecting talent with projects based on qualifications, ensuring a fair and transparent process that values diverse perspectives and global collaboration.

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