Jay Stewart

Product engineer. I talk to users and ship with coding agents.

Available now for remote contract work with early-stage startups. UK citizen and tax resident. Book a 20-minute intro call or get in touch.

What I can do for you

• An MVP or first version, from a conversation about the problem to something real people use, in weeks rather than months.
• Find out what your users need before you build: interviews, reading what they actually say, a small experiment with a stopping rule.
• Payments that hold up: Stripe Connect for marketplaces and platforms, reconciliation, and what happens when something upstream fails.
• A feature on an existing product, in your codebase and your conventions, with tests and a pull request you can review.

How working with me goes

• We start with a small paid first piece of work, so you can judge the result before you commit to more.
• A demo every week. The code lives in your GitHub from day one.
• I build with coding agents and own what they produce: every change goes through a pull request, tests and a check in a real browser.
• I work hours that overlap with UK, European and US time zones.

Recent work

SpiralClass, a live scheduling, payments and video platform for independent teachers, built and run solo, and WantToJoin, which went from a user-research finding to a pilot at a hostel in three days. Details on the work page.

Before that, eight years of e-commerce backend work on systems that hold other people's money. CV (PDF).