We're growing fast, closing a significant funding round, and building our tech stack from scratch. We're looking for a Tech Lead who builds — the whole thing. The person who writes the first line of code, makes the stack decisions, and ships everything we need into production: the AI agents, the backend, the data, and the product users actually touch. Stand up our tech stack from scratch — you choose it, you build it, you own it
Make the calls: what we build in-house, what we buy, what we outsource
Ship fast and keep it shippable. WhatsApp lead qualification that actually converts
You'll architect these and build them — and design the data and feedback loops that make them better over time
The defensibility of Libeen's technology is something you'll build with your own hands: proprietary data, AI systems that improve as we grow, infrastructure that can't be bought off the shelf
You should be able to walk into a room with an investor and explain, technically, why our tech is hard to replicate
You'll build the frontend too: clean, fast, trustworthy. You don't have to love CSS, but you have to be able to ship a real product front to back without waiting for anyone
Lean on modern tooling, component libraries and AI to move fast — what matters is that it ships and feels solid
Decide how we work: code quality, deployment, what "done" means
5+ years building software as a true fullstack engineer — backend, frontend and everything in between — and you're still hands-on
~ Real depth in backend, systems and AI is where it matters most: that's the core and the moat. Frontend you can do well, even if it's not your first love
~ Pragmatism over perfection: you know when to build it right and when to build it now
~ You want to build the thing, not just lead the people who build it (yet)
You've integrated document processing, scoring, or messaging (WhatsApp / Twilio-style) systems
Full ownership of the technology from day one, working shoulder-to-shoulder with the founding team
Hybrid model based in Madrid — we build together, in the room
Fluent Spanish Fluent English