Full Stack Developer

Founding Engineer (Full-Stack, AI)
Location: (HYBRID) Knightsbridge, London 
2 days per week in office, 3 days remote

Salary range: £70,000-£95,000 + vested equity

We're building AgentNode: AI-powered lead follow-up and appointment setting for US real estate agents. We already sell to these agents every day, so you'll have real users on your product within days of shipping - not quarters.

We're hiring our first engineer. You'll be employee number one on the technical side, working directly with the two founders, and you'll own the platform end to end.

Job Role:
* Create the product end to end - frontend, backend, data model, deployment. The architecture decisions are yours to make and defend.
* Build the AI workflow layer: LLM-driven lead engagement, follow-up and appointment setting, with a human-in-the-loop review step before anything is sent.
* Ship weekly against real customer feedback.
* Set the technical direction - stack, infrastructure, security, and how we handle compliance in a regulated messaging environment.
* Grow into the engineering lead. As we raise and hire, you're the person who builds and runs the team.

Key Requirements:
* A strong full-stack engineer who can take a web product from an empty repo to live on your own (React/Next.js with Node or Python, or a comparable modern stack).
* You've shipped with LLM APIs in production - prompt design, structured outputs, chaining and orchestrating multi-step workflows. Not just experimented.
* Comfortable building against third-party REST APIs and webhooks, and you can design a sensible relational data model without supervision.
* You've handled the unglamorous foundations: authentication, multi-tenant account structure, basic security practice, Stripe billing.

Bonus Points:
* Telephony and messaging APIs (Twilio-style SMS and voice)
* CRM integration work - Follow Up Boss, GoHighLevel or similar
* AI model routing, eval or prompt-management tooling (OpenRouter, BrainTrust, LangSmith)
* Real estate, proptech or martech experience
* Scaling a small product into a larger platform, or building out an engineering team behind you

The Offer:
£70,000-£95,000 depending on experience, plus meaningful vested equity. 2-3 days a week in our Knightsbridge office, flexible on the rest. The autonomy that comes with being the first engineer in the room.