Product engineer · end to end

Jack
Heriz-Smith

I build products end to end: the schema, the service, the interface, and increasingly the AI in between. At Sourcerie I lead product engineering for a customer insights platform, and build the internal AI tools that keep a small team fast. This site is an editor: select things, move them about, make it yours.

Get in touch

What I'm good at

The whole product Scoping, sprinting and shipping: Postgres and Kysely at the bottom, React and Next at the top, and the pixel details nobody briefs. Comfortable owning all of it.

AI that earns its keep Five internal AI tools in production at one company, recreated as the demos below. Claude integrations that survive contact with real users, queues and budgets.

Teams that deliver Fast sprints scoped honestly, mentoring from apprentices to bootcamp cohorts, and the retrospection that keeps quality and pace in balance.

Recent work

Sourcerie The customer insights OS for consumer brands on Shopify. Product engineering end to end: React, Node, Postgres, GCP, and everything between the schema and the shadows.

Tools I've built there, rebuilt here as simulated demos

Data ▶ demo Ask-the-database analytics: plain-English questions compiled into careful SQL.

Notes ▶ demo Turns transcripts, CSVs and recordings into designed webpages: a different layout, colour scheme and scorecard per note type, generated on the edge.

Pulse ▶ demo Tracks how AI assistants talk about a brand: weekly sweeps across answer engines, scored against competitors, with cited quick wins.

Read Only Everything ▶ demo One search across Slack, Gmail, Calendar, Notion and the database. Read-only scopes by design, so it can be trusted everywhere.

Slack bots report-bug-bot and user-story-bot: Claude-powered bots that turn Slack threads into well-formed tickets and user stories in Notion, chasing missing context in-thread themselves.

Client work

lydiasamuels.com ↗ Site for Lydia Samuels, performer, composer and arranger. torimarshtherapy.com ↗ Site for Tori Marsh, art psychotherapist offering Art Therapy and EMDR across Suffolk, Norfolk and online.

Off the clock

sweepr.online ↗ A daily minesweeper where the week sets the difficulty: Monday is a warm-up, Sunday is brutal. Vanilla JS, Cloudflare and one very moreish grid. Claude Usage ↗ A menu bar app for macOS, Windows and Linux showing Claude Code usage limits in real time, with local analytics by project, branch and time of day.

Open to

Senior and lead product engineering roles, fractional or interim product leadership, and the occasional freelance build. The fastest routes are a comment on this file (the ＋ pin) or LinkedIn.

Let's build something good. GitHub LinkedIn

On a desktop this page becomes an editor: layers, stickies, a second cursor called Jack. Worth the trip.