You'll be our founding engineer, working directly with our technical co-founder and CEO. You'll own large parts of the backend, our agent infrastructure and the data layer, and you'll ship to customers

What you'll work on Postgres-backed services and APIs that run thousands of agent workflows a day

Autonomous agent systems: multi-step, multi-model pipelines that research, score, write and check their own output

Data pipelines that pull in Linked In, job-board, company and enrichment data and turn it into signals

Customer-facing features end to end, from the first call to production The engineering culture and hiring bar, from day one Who you are

You've done zero-to-one before. You joined a company at or near zero revenue, as a founding engineer, first engineering hire or CTO, and stayed while it grew. You can tell us what you changed to make that growth happen.You have strong fundamentals. *Frameworks come and go. We care that you understand:1.

Networking: how HTTP, browsers and servers actually work2.

Data:



data structures and databases. This knowledge compounds forever3.

Algorithms and architecture: you can design a system and explain its trade-offs4.

Product: you can take a messy customer conversation, split out what's essential right now, and defer the rest

What we offer To be upfront: the cash is below market, and the equity is the offer. Modest cash salary (we'll share the exact figure on the first call)

A significant equity stake that grows with the next round, and grows substantially if you step into the CTO role A founding title, with real ownership over architecture and product decisions The chance to build an AI-native company from the ground floor, with paying customers already on board

Madrid-based team. We're happy to start remote within Europe, with relocation to Madrid as the long-term goal

📌 Founding Engineer (Madrid)
🏢 Archteam
📍 Madrid