Full-Stack Engineer
Own products for years rather than weeks — build them properly, keep them alive, and make the agentic build method something a team can rely on.
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.



The first eighteen months are deliberately spent building as much as possible for the group while the machine gets set up. 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. We work in two halves. 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.
We are hiring the engineers for the second half.
We are hiring at two levels, and we would rather say so than let you guess. 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

📌 Full-Stack Engineer (San Cugat del Vallés)
🏢 Leyton
📍 San Cugat del Vallés