First Engineer: Own the Full Stack — Remote

Hire #1. Own the entire technical surface: server-side, UI, data, the typed graph and salience layer, infra and security, and build the product shoulder-to-shoulder with the founder, who stays on as CPO.

Work directly with the founder; CET/CEST overlap. Remote works from the EU or US only, we can only consider candidates based in the EU or the US.

Hebbian is building the memory layer for SMEs: a living, Hebbian-learning knowledge graph that turns a company's scattered knowledge (and each employee's) into a brain that holds what the company knows, governs what every role is allowed to see, and powers AI that actually knows the business.

Our mission is to give every company and every person a brain that holds what the work produces: memory captured from work instead of being lost to it, and that makes the AI built on top of it actually know the business and the people in it. It is in production today, built by a solo founder working with AI agents on one shared memory; the people we hire now are the first humans alongside the founder: equity-heavy, high-ownership, no bureaucracy.

In the near term, Hebbian is building toward a memory layer for companies and their people: company knowledge that survives turnover and a portable professional memory for each employee, powering AI that knows the business. The longer bet, over the next ten to fifteen years, is a world where every company and every person has memory that compounds with use.

What you'll do

• Own the whole stack, you do it all: server-side, client-side UI, data, the typed graph and salience layer, infra, security and DevOps. This is a full-stack-everything seat, not a specialized slice.
• Build the product shoulder-to-shoulder with the founder/CPO: the founder owns product direction and stays hands-on on the product day to day, while you own the technical surface. You build it together.
• Harden the platform to sellable-grade: performance, reliability, and the rough edges that stand between a working product and one you can sell with confidence.
• Retire the technical single point of failure: today the whole stack rests on the founder. You take the technical surface off the founder's plate, freeing the founder to stay on as CPO, focused on product, not stepping away from it.
• Build Value Loop 2: the self-serve path from connecting a tool to a working brain, and grow the integrations library behind it.
• Own the security surface: RLS, tenant isolation, and the access boundaries that let a company and its people share one memory safely.

What you'll own

• The entire technical surface: backend, frontend, data, the typed graph and salience layer, infra, security and DevOps. End to end, all of it.
• Value Loop 2 (self-serve connect → brain) end to end.
• The integrations library and the framework new connectors plug into.
• The security / RLS / tenant-isolation surface.
• Engineering culture: you set it, as the first engineer.

About you

• You've shipped and operated real production systems, not just prototypes.
• Comfortable across the stack: data, backend, and enough frontend to be dangerous.
• You think in terms of isolation, correctness, and what breaks at scale.
• You want ownership and equity over a big title and a big team.
• Deep technical interest in what we actually build: scaling infra and production, but also truly understanding the layers of the brain (the typed knowledge graph and the learned-relevance layer) and wanting your hands in all of it.
• Advanced, hands-on with AI: you build AI-augmented every day and treat 10x–100x leverage as the baseline.
• Genuinely excited by the idea of digital brains for companies and the people in them, caring about the mission, not just the stack.
• A real fit with how we work (see "How we work"), our values are how we choose teammates, not wall art.

The deal

Cash

up to €6,500/month gross (payroll), or up to ~€11,000/month via your own management company

Equity

1.5–3% (4-year vest, 1-year cliff), more equity, less cash; 1.5% takes the full listed wage

Structure

Your call on both the split and the engagement: at 1.5% equity you take the full listed cash, and you can dial equity up toward 3% for less cash. Belgian payroll up to €6,500/mo gross, or invoice up to ~€11,000/mo via your own management company, same cost to us (we'd otherwise carry employer charges on top of gross), and you optimize your own tax.

• You are hire #1.
• Work directly with the founder and the AI agents that run on the same shared memory.
• Office-first and genuinely connected. We really believe in 996 (the founder runs 997; we'd ask you to run 996) and in being in the room together, in a living-room-style office that's to follow soon. Live too far? We're open to remote (within the EU o