Agents write code faster. XP makes change safer
Agents change the economics of producing code. They do not change the need for confidence in changing software.
James Sawle · Principal Engineer
Software, systems, and change
I’m a Principal Engineer interested in how software stays useful as its users, teams, and constraints change.
This is where I publish considered notes on architecture and engineering practice, and document the open-source tools that grow out of that work.
Writing
Essays and working notes about software architecture, engineering practice, and building systems that can change.
Projects
Open-source developer tools and experiments for spec-driven, AI-assisted, and everyday engineering workflows.
osch
A CLI for managing and sharing OpenSpec schemas across repositories for AI-assisted development workflows.
View projectSkills marketplace
A personal marketplace of reusable skills for Claude Code.
View project