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Full-stack Engineer – Internal AI Platform

Spain, Madrid Employment contract · Job Posted January 13, 2026
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Job Description

You will engineer the core of our proprietary internal platform that democratizes AI across the company. This is not a standard full-stack role maintaining existing systems, you will build the factory that enables other teams to create autonomous AI Agents. You will design Chain of Thought reasoning flows, integration layers, and agent logic that allow AI to execute complex business tasks at scale. This is applied AI engineering: no model fine-tuning, just sophisticated system design and relentless execution. You will join a new focused team of two engineers, collaborating daily with the AIGO team and cross-functional partners across Global Operations, Customer Satisfaction, and Engineering.

Job Responsibility

  • Develop and expand our internal AI platform, enabling internal teams to build autonomous AI Agents without deep ML expertise
  • Engineer Chain of Thought reasoning flows and integration layers that power agent logic
  • Build reliable, long-running AI Agent systems that handle failures at scale and prevent cascading outages when external LLM providers go down
  • Design node-based tools for intent retrieval, context management, and API routing
  • Program agent logic using TypeScript, Node.js, Express, React, Next.js, and SQL
  • Maintain a high bar for software quality and reliability while innovating at speed
  • Integrate AI-native tooling (Cursor, Claude Code) into your development workflow without sacrificing code quality

Requirements

  • Deep expertise in TypeScript, Node.js, Express, React, Next.js, and SQL
  • Practical knowledge of Docker, Kubernetes, and Linux environments
  • Hands-on experience with Chain of Thought (CoT), Agent building, and RAG concepts
  • An AI-First mindset: you already use Cursor or Claude Code and possess the engineering rigor to validate AI-generated code
  • Proven track record of shipping software to production

Nice to have

  • Proficiency with Cursor or Claude Code
  • Advanced knowledge of ML theory (helpful for context, though fine-tuning is not part of the role)

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