Senior Full Stack Developer – Agentic AI (Temporary)

At EX Squared LATAM, we are a digital transformation company focused on building innovative, high-impact technology solutions that drive real business value. We partner with top-tier clients across global, regional, and local markets, fostering a collaborative, inclusive, and innovation-driven culture where your ideas truly matter. Role Overview We’re currently looking for a Senior Full Stack Developer with strong experience in React, Node.js, TypeScript, and agentic AI workflows. You’ll help our client build and maintain a catalog of AI agents designed to support the software development lifecycle, including code generation, quality assurance, product management, design-to-code, and content-authoring workflows. This position combines full-stack engineering with prompt engineering, agent development, evaluation, observability, and continuous experimentation. The ideal candidate is a collaborative and proactive engineer who can explore emerging AI technologies, turn ideas into practical solutions, gather feedback from delivery teams, and continuously improve agent performance. Location: Fully remote position within LATAM. Contract Duration: 6-month fixed -term contract with possibilities of extension. Language Requirement: Advanced English. What you'll do Build and maintain AI agents supporting software development, QA, and product teams. Develop code-generation, coding-standard, design-to-code, and workflow automation agents. Design structured, dependency-aware agentic workflows rather than single-prompt solutions. Create agent skills, prompts, tool interfaces, and reusable workflow components. Implement evaluation and observability practices to monitor agent quality and performance. Develop self-validation and error-recovery loops using testing and type-checking results. Build and maintain applications using React, Node.js, and TypeScript. Develop and consume REST and GraphQL APIs using established best practices. Integrate agents with internal systems, SaaS platforms, APIs, and development tools. Collaborate with delivery teams, collect feedback, and improve existing agent solutions. Research emerging AI tools, frameworks, vendors, and local model alternatives. Document agent behavior, architecture decisions, limitations, and usage guidelines. Apply security, accessibility, testing, and performance standards throughout development. Participate actively in team discussions, technical planning, and solution design. What you'll bring 5+ years of professional full-stack development experience. Strong hands-on experience with React, Node.js, and TypeScript. Experience building, integrating, or maintaining agents and agentic workflows. Knowledge of prompt engineering, task decomposition, context management, and tool calling. Understanding of agent evaluation, observability, validation, and error-recovery patterns. Experience consuming GraphQL APIs, ideally using Apollo Client. Experience with REST APIs and third-party SaaS integrations. Familiarity with AWS, Docker, and cloud-based application architecture. Experience with automated testing tools such as Jest, Cypress, or Vitest. Understanding of secure API development, OAuth2/OIDC, API keys, and access controls. Experience developing accessible interfaces aligned with WCAG 2.1 AA. Ability to structure clean, scalable, and maintainable application code. Strong documentation and technical communication skills. Advanced English and the ability to collaborate in a distributed environment. A proactive, exploratory mindset with the ability to work independently. A Mac computer meeting the client’s BYOD requirements, preferably with 32 GB RAM. What will make you stand out Experience creating agent skills using Markdown-based instructions. Knowledge of RAG and other retrieval-based AI patterns. Experience with LLM structured outputs, function calling, or tool calling. Familiarity with golden test sets, LLM-as-judge, and prompt regression testing. Ability to define measurable quality metrics for agent outputs. Experience with MCP-compatible REST or GraphQL APIs. Familiarity with agent frameworks such as LangGraph, LangChain, CrewAI, or Mastra. Experience working with GitHub Copilot, Claude, OpenAI, or local models. Experience with Next.js, server-side rendering, GraphQL, and Apollo. Familiarity with AWS ECS Fargate, Aurora, OpenSearch, S3, EventBridge, SQS, Cognito, or Bedrock. Experience with headless CMS platforms or Adobe Experience Manager. Knowledge of logs, metrics, distributed tracing, and SLO definition. Experience integrating platforms such as Microsoft Graph or social media APIs. An experimental mindset and enthusiasm for rapidly evolving AI technologies. Why EX Squared? At EX Squared, we believe in building strong, collaborative teams that create meaningful impact. You’ll work alongside talented professionals across the region, contributing to innovative projects while continuing to grow your career in a supportive, flexible, and people-focused environment. We value curiosity, ownership, continuous learning, and open collaboration, creating an environment where professionals can thrive, grow, and make a difference. What We Offer Competitive compensation in USD. Access to learning platforms and professional development opportunities. Flexible work environment. Collaborative and multicultural teams. Eligibility Note This opportunity is only available to candidates currently residing in Latin America. Applications outside these regions will not be considered. Ready to become an EXpert? Join our EXperts team! #ApplyNow