I'm James Hillman — a construction estimator turned product builder. I design, engineer and commercially launch SaaS and mobile products, from first idea to production release.
Certificate and document management for UK businesses, with organisation permissions, private PDF storage, automated reminders and live subscription billing.
A local-first website scanner that finds broken links, browser errors and interface issues, then connects each finding to real Chromium evidence and practical fixes.
A native watercolour companion that compares target colours against an artist’s own paints, suggests approximate recipes and saves palettes and reference photos locally.
An iPhone app for UK sole traders to record income, expenses and invoices, scan receipts and check estimated tax.
An expressive text creation app for iPhone and iPad. Repeat messages, explore typography and emoji combinations, and save creations to share anywhere.
I work in construction estimating and build software alongside it. My projects range from a business SaaS platform and an open-source website scanner to native iPhone apps. I write about the implementation here: the architecture, integrations, testing and decisions behind each release.
More about meI use a mix of tools for web and iOS development. I’m also interested in where AI agents can help with the work, and what it takes to make them useful.
Swift 
React 
TypeScript 
Python 
Node.js 
Astro A chronological development diary for 1–4 November 2026: safer bookkeeping, cross-platform testing, a clearer website and tracing a Linux deployment timeout.
Tax clarity for UK sole traders. Our waitlist is now open at quiktax.co.uk
I finally made my first open source contribution to the first-contributions repository.
I’m open to product collaborations, independent software development, consultancy and selected web design projects. If you have a product to build or a business problem to solve, let’s talk.
jshcodeworks@gmail.com
