Senior FullStack Developer, React, Node, AI
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Job Description
Senior FullStack Developer designing applications using React and Node at EX Squared LATAM. Role focuses on automated pipelines and agent-driven workflows within a collaborative team environment.
Responsibilities:
- Use modern tools and frameworks (REACT and Node.js) to architect and develop applications from the ground up
- Build and maintain automated evaluation pipelines (evals) for agent and skill outputs
- Define strict input/output contracts for MCP tools and agent skills using typed schemas
- Own the prompt engineering lifecycle for assigned tools and skills
- Contribute to the team's MCP tooling catalog
Requirements:
- 5+ years of working knowledge with modern frameworks and languages (REACT & NodeJS)
- Familiarity with OAuth2/OIDC, API key management, and access audit trail patterns
- Experience with SSR applications.
- Experience with GraphQL and Apollo.
- Experience building or integrating MCP-compatible REST/GraphQL APIs; familiarity with tool interface contracts, versioning, and consumer documentation.
- Familiarity with SLO definition and basic observability practices (logs, metrics, distributed traces) for production API services.
- Hands-on experience with LLM structured output patterns: function/tool calling
- Familiarity with LLM evaluation approaches: building golden test sets, LLM-as-judge pipelines, and prompt regression testing; ability to quantify output quality with measurable metrics rather than vibes.
- Experience building agentic workflows — multi-step tool chains, state machine-based agents, or orchestration frameworks (LangGraph, LangChain, AutoGen, or custom) — with an emphasis on deterministic routing and graceful failure handling
Benefits:
- Competitive compensation in USD
- Access to learning platforms and professional development opportunities
- Flexible work environment
- Collaborative and multicultural teams
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