Jonathan Leahy
Full-stack developer, based in Bristol, UK. Builder of things.
Staff Engineer at Pismo, A Visa Company, building payments infrastructure at scale. On nights and weekends I'm running an experiment: can a whole software company run on AI agents? I've tried versions of this before — this one's working well enough that I'm pushing it further, to see what an agent-driven company actually becomes. Find out more in my book, The Rented Codebase.
Featured Projects
Gyrum.ai
An ongoing experiment in agent-run software — agents that plan, build, review, and deploy. 93+ projects shipped so far.
About me
Decades shipping software — now a passion project: automating the entire product workflow with AI agents working Agile, build to ship to support. More about me →
The Rented Codebase
My book (with Claude as drafting partner) on the AI dark factory behind Gyrum — why your code is rented, and the blueprint is what you actually own.
Gyrum.io
Another experiment — Kubernetes-based SaaS services, multi-tenant and self-serve from the ground up. The same dark-factory idea as the book, run as a platform.
HipHip
Team recognition and kudos board. Give shout-outs, track streaks, celebrate wins.
Buzzy
Family chore bounty board where kids earn pocket money. Multi-currency, QR invites.
Cannon Drop
Physics-based browser game — idea and build by one of my AI agent companies, just for fun. Aim, fire, destroy targets.
Days Out For The Family
Find family-friendly attractions and days out across the UK — search, favourite, and discover places near you.
What I work with
Go, TypeScript, SvelteKit, React, PostgreSQL, Docker, Kubernetes, CI/CD pipelines, and AI across the stack — Claude, Codex, Gemini and GLM 5.2, with ElevenLabs for voice and Imagen for images.