Own one or two product surfaces end to end, including UI, Postgres schema, edge functions, deployment, and post-deployment operation

Build and operate LLM-backed product functionality, including prompts, retrieval, evaluations, cost and latency optimization, and output validation

Convert customer objections and call transcripts into shipped product

Build with coding agents and take responsibility for their output

Improve codebase rules, agent skills, and gates that catch problems before human PR review

Talk directly with recruiter customers to understand what is broken

Participate in a small-team, fast-decision engineering process using Linear, feature branches, PR review, squash merges, protected main, and deploy-on-merge

Collaborate asynchronously with regular in-person time

Requirements Strong TypeScript and React fundamentals

Shipped full-stack features and operated them, including migrations, auth, deploys, and production debugging

Shipped something with an LLM in the critical path and kept it working

Experience working inside a real engineering pipeline with branches, code review, CI, and releases

Daily use of coding agents; ability to explain prompting, reviewing, and validating agent output





Ability to reason about unfamiliar code and catch plausible but incorrect agent output

Ability to work independently, identify next steps, and ask promptly for missing information

Existing right to work in the EU or EEA

English for company communication

Familiarity with TypeScript, React, Postgres, Supabase, Next.js, Vercel, Linear, Node.js or Python is relevant; not all stack experience is expected

Core Competencies Demonstrates expertise in full-stack development with a focus on TypeScript and React, while effectively managing product surfaces and collaborating in a fast-paced engineering environment. Proficient in deploying LLM-backed functionalities and optimizing performance through rigorous testing and validation.

Highest-signal resume keywords TypeScript

React

LLM Integration

Postgres

Full-Stack Development

Hard Skills Full-Stack Features

Production Debugging

Migrations

Auth

CI/CD

Soft Skills Independent Work

Problem-Solving

Communication

Industry Keywords Engineering Pipeline

Code Review

Deployment

Agent Output Validation

Customer Collaboration

Tools & Technologies Linear

Supabase

Next.js

Vercel

Node.js

Python

📌 AI Engineer - Full-Stack (Barcelona)
🏢 Jobtailor
📍 Barcelona