We're looking for a

Full Stack Engineer for one of our clients who enjoys building new products from the ground up and is eager to help shape AI tooling for the mobility industry.

Work across the full stack to solve complex problems using incomplete and messy data

Design and evolve canonical data models

Build pipelines to handle real-world data inputs

Define and implement methods to resolve conflicting data

Build and orchestrate agents that reason over data and take action

Design agent behavior, including failure and recovery processes

Create outputs that are explainable and auditable

Ship features from idea through to production

Help shape product direction, not just implement technical decisions

Strong full-stack engineering skills (tech stack experience is flexible)

Comfortable working with ambiguity and messy,



inconsistent data

Ability to take problems from concept to shipped solution

Product-oriented mindset, focused on delivering outcomes

Open to forming and revising strong opinions as the project evolves

Demonstrated ability to think creatively and critically about what you build

Ruby on Rails (API)

React / Next.js

Python (data and AI orchestration)

Competitive salary: €40,000 to €80,000

Meaningful equity

Versátil working (3 days in office)

Barcelona HQ with beachfront location

Generous holiday allowance plus public holidays

Team off-sites in exciting locations

📌 Full-Stack AI Tooling Engineer — Product Vision & Equity (Madrid)
🏢 Joppy
📍 Madrid