Full-Stack Engineer
Mainloop is a new engineering team inside an established international group . We are in Barcelona, we are being built from scratch this year, and we have the backing, the customers and the product portfolio of a company that has been around for decades. You get the interesting part of a new team without the part where you check whether payroll clears.
Two more things about where this comes from and where it goes. The group has been running a tech lab in Casablanca for more than eight years — Barcelona is its second, built to sit closer to the teams we build for, and AI-native from the first commit, because it starts from a blank page. And the plan does not stop at internal work: within about a year and a half we intend to externalise — external clients, our products sold on the market, products developed for it. You would arrive at the start of that curve, not after it.
What we build is the software that automates professional-services work — across roughly fifteen countries, for businesses that are drowning in process. One half goes into a business,



works out what actually happens there, and builds a prototype fast enough to prove it is worth having. The other half — this half — takes that prototype and turns it into something a company depends on. Most automation teams only have the first half, which is why most of them have a drawer full of demos and nothing in production.
There are four junior seats and one senior seat . The junior seats are open to people coming out of university and to young engineers generally — what we are looking for there is not a track record, it is appetite : you want to get very good very fast, and you have already been building with coding agents (Claude Code, Cursor, Codex or similar) because you found them interesting rather than because someone told you to. The senior seat is for someone who has owned production software for years and is ready to set the architecture others build inside. Apply to the same ad eit

📌 Senior IT Full Stack Developer (España)
🏢 Leyton
📍 España