Descripción de la oferta
About Libeen
At Libeen we're reinventing access to homeownership in Spain. Our rent‑to‑own model lets people live in their future home while building up their option to buy. 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, not an architect who draws diagrams and delegates. 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. For now you are the engineering team. You're paired with a Product Manager who owns the what and the why, while you own the how — front to back. As we grow, you'll hire specialists and the role narrows; right now, breadth wins.
If the last time you committed code was two years ago, this isn't your role.
What you'll do
Build the foundation
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. We measure idea‑to‑production in days, not quarters
Build the AI agent ecosystem (this is the core of the job)
WhatsApp lead qualification that actually converts
Automated financial scoring with document reading
Personalised property recommendations
Real estate due diligence
You'll architect these and build them — and design the data and feedback loops that make them better over time
Create the moat
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
Build the product users touch
The agents are the engine, but people still live inside an interface — the journey from first conversation to signing their home
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
Set the engineering bar
You're the first engineer and the standard for everyone who comes after
Decide how we work: code quality, deployment, what "done" means
As we grow, you'll hire and lead the technical team — but for now, you build
What we're looking for
5+ years building software as a true full‑stack 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
You've shipped production systems end‑to‑end, ideally as a founding / first engineer or early lead
Hands‑on experience building with LLMs and AI agents — prompting, orchestration, RAG, evals, the real work, not just the demos
Pragmatism over perfection: you know when to build it right and when to build it now
You can make architecture decisions you'll have to live with, and own the consequences
High energy, strong bias to action, and zero ego about doing the unglamorous work
You want to build the thing, not just lead the people who build it (yet)
Nice to have
Experience in fintech, proptech or complex financial / regulated products
You've integrated document processing, scoring, or messaging (WhatsApp / Twilio‑style) systems
You've been part of a 0‑to‑1 build and know what that actually costs
You've helped tell a technical story to investors
What we offer
Full ownership of the technology from day one, working shoulder‑to‑shoulder with the founding team
Competitive salary + phantom shares plan
Hybrid model based in Madrid — we build together, in the room
The chance to build something that genuinely changes how people access homeownership in Spain
Our process
Short intro call to get to know each other
A working / technical session with a real Libeen case
Final conversation with the founding team
Languages
Fluent Spanish, Fluent English
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