Jay Stewart

Product engineer. I find out what users need, then ship it with coding agents.

Available now for remote contract work with early-stage startups: MVPs, first versions and product engineering. UK citizen, UK-registered sole trader. Book a 20-minute intro call, get in touch or read my CV (PDF).

What I've shipped

WantToJoin: before writing code I read 2,800 messages from a hostel's guest WhatsApp group. They showed the hosts, not the guests, were the customer. Three days later it was in a live pilot at that hostel. I'll publish the results, good or bad, after the one-week trial ends on 14 October.
Beckon: a remote inbox for terminal agents. I turned a repeated developer pain into a Go CLI and web app, with end-to-end encrypted messages and signed remote responses. Built through staging; not yet in production.
SpiralClass: a scheduling, payments and video platform for independent teachers, built and run solo. It is live on real payment rails (Stripe Connect and Wise) with nine real users, and every change goes through a pull request and a gate.

How I work

Start with users. I talk to them, read what they actually say, and change the plan when the evidence points somewhere else.
Experiments have a stopping rule. The hypothesis, what to measure and when to kill it are written down before any code.
I own what the agents write. I build with coding agents, and every change goes through a pull request, tests and a check in a real browser.

Before this

Eight years of e-commerce backend work on systems that hold other people's money, including Dyson's store, and a booking and payment platform I built and ran for four years. For contract work I start with a small paid first piece, so you can judge the result before committing to more.