AI Engineer

JobFluent; Barcelona; Hybrid; EUR 40,000 - 50,000; Full time

Benefits offered by this job

AI tooling access

Urban Sports Club membership

Flexible working hours

Modern office in Poblenou

Job summary

haddock is seeking an AI Engineer in Barcelona to design and ship scalable AI systems that power restaurant workflows. The role is hybrid, with at least two days per week in the Poblenou office.

You will work on production-grade AI solutions, collaborate with product and customers, and help push the product forward with robust observability and cost-conscious engineering. Salary ranges €40–50k gross/year with benefits and modern office.

Qualifications

• 2+ years of hands-on experience building AI systems in production.
• Fluent in Spanish and comfortable in English.

Responsibilities

• Architect and ship AI solutions for restaurateurs, balancing latency, cost and accuracy.
• Own AI observability end-to-end: monitor traces, eval frameworks, and close the improvement loop as fast as possible.
• Build backend and frontend code to integrate AI capabilities into the product.
• Talk to customers to validate new solutions and get feedback.

Skills

AI systems development

Spanish language

English language

Production-grade ML

Tools

TypeScript

Python

langfuse

PostHog

Google Cloud Platform

Postgres

MongoDB

Job description

haddock is looking for a AI Engineer with 2+ years of experience

Hybrid in Barcelona (at least two days per week at their office in Poblenou)

Vacation & perks: All AI tooling that you wish to experiment with, a subsidized Urban Sports Club membership, flexible working hours, a bright modern office, PayFlow, and many more (see below)

haddock is the market leader solution for point of control in restaurants, handling all back-office vital operations like product management, inventories, purchases, price tracking, document conciliation, bank conciliation, paychecks, clocking in/out, P&L reports, etc.

Not only they have a system of record that helps operate restaurants with control and clarity, but they are also the leaders in offering AI Agents, starting with Fina. They work 24/7 doing the heavy, tedious work that their customers don't have time to do well.

This is no AI hype. haddock's customers obtain visible value from their AI Agents, both in money and time saved. They are becoming strategic partners in the design of their businesses.

Their mission is to empower millions of restaurateurs to level up their business.

Their vision is to lead the market through innovation, strong relationships and by becoming the go‑to tech partner for restaurant success.

haddock is backed by Y Combinator, the accelerator behind Airbnb and Twitch. they are growing fast with support from top‑tier investors like JME, Decelera, Extension Fund, Wayra, and Zone2Boost.

Why are they hiring?

Last month, haddock users consumed +15 billion tokens through our AI products. This isn't AI hype, it's our AI workforce, running 24/7 for thousands of restaurants across Spain. And we're just getting started.

We're looking for an AI Engineer who is analytical, quantitative, and deeply AI-native. Someone who parallelizes hypotheses using coding agents, moves fast, and stays relentlessly focused on building AI solutions that scale and solve real customer pains. Someone who measures before optimizing, but never lets analysis slow down shipping.

Architect and ship AI solutions for restaurateurs, balancing latency, cost, and accuracy

Obsess over efficiency: a single line of code has saved us thousands of dollars, minutes of latency, or unlocked a step‑change in accuracy. You'll think this way by default.

Own AI observability end-to-end: monitor billions of traces, design evaluation frameworks, and close the improvement loop as fast as possible.

Build backend and frontend code to integrate AI capabilities into the product

Do your own project management, rolling out your initiatives to customers

Talk to customers to validate new solutions and get feedback

2+ years of hands‑on experience building AI systems in production. Not experiments, real workflows that customers rely on.

You're truly AI-native: you follow new models, papers, and techniques, and you continuously refine how you use them in practice.

You're also AI-native in how you build: you use modern AI‑powered dev tools (Claude Code, Cursor, Codex or similar) and assemble your own agents and workflows to move faster.

You combine engineering rigor with product thinking. You design, debug, and improve end-to-end systems that solve real problems.

Fluent in Spanish and comfortable in English.

You’ll stand out if you have experience with

AI observability platforms like langfuse (tracing, metrics, evals for LLM apps and agents)

Designing and running evaluations

Multimodal LLMs, especially vision models for OCR document understanding

Building and orchestrating multi‑agent systems

RAG systems and vector databases

Designing or working with MCPs

They are building something ambitious, and they are looking for someone ready to grow with us, take real ownership, and shape the product’s future.

This is more than a job. It’s a chance to leave your mark on an industry that’s ripe for transformation. Their best perk is honestly their work environment and the opportunities you'll get to learn and grow at haddock.

Their Tech Stack

TypeScript, Python, langfuse, PostHog, Google Cloud Platform, mastra, Postgres, MongoDB, and several AI providers

They heavily use AI workflows and agents for their development, but also to empower the entire organization to 10x productive. What a time to be alive!

What do they offer?

A competitive salary (€40–50k gross/year), that will increase as haddock and you grow.

A bright modern office in Barcelona, in Poblenou. Probably the best office you've ever worked at.

They currently spend at least 2 days per week at the office, because they believe that in‑person frequent interaction helps us communicate better, gain trust with each other faster, and achieve better outcomes. The other 3 days, they usually work from home to have more focus and get things done.

All AI tooling that you wish to experiment with.

Enjoy benefits when spending part of your salary, thanks to Playflow.

Their Hiring Process

• Intro call with Enric (AI Lead), 25 mins
• Call with Pol (co‑founder, CPO), 25 mins.
• Technical interviews with Enric and Guillermo(Head of Tech) (2 hours).
• Final call with Arnau (co‑founder, CEO), 25 mins.