Full-stack developer

Jack
Heriz-Smith

I design and build software end-to-end: web apps, data tools and AI services that people actually enjoy using. Currently building at Sourcerie. This site is an editor: select things, move them about, make it yours.

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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 AI note generation on the edge: queues, KV, R2 and a deliberately tiny UI.

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.

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.