AI Engineer – Full-Stack

Jobtailor; Barcelona; Presencial; EUR 65.000 - 90.000; Jornada completa

Descripción de la vacante

Jobtailor is seeking a capable full‑stack engineer to own end‑to‑end product surfaces, including UI, Postgres schemas, edge functions, deployment, and post‑launch operation. You will build and operate LLM‑backed features, focusing on prompts, retrieval, cost and latency optimization, and output validation.

You will translate customer objections into shipped features, work with coding agents, improve rules and gates, and collaborate with recruiters in a small, fast‑paced team.

Formación

• 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.
• Collaborate 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.

Responsabilidades

• 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.
• Collaborate in a small-team, fast-decision engineering process with Git workflows and deploy-on-merge.
• Collaborate asynchronously with regular in-person time.

Conocimientos

Independent Work

Problem-Solving

Communication

English Proficiency

Herramientas

TypeScript

React

Postgres

Supabase

Next.js

Vercel

Node.js

Python

Descripción del empleo

• 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