All tools should now have two users
Our dev environment tool ran 2686 commands in 24 days and I typed almost none of them. What we learned building Dev Center for two users at once: the engineers in the app, and the agents at the CLI.
Writing
Engineering practice, systems, leadership, and the tools changing how we work.
Understanding Bitmaps
A bitmap is a compact array of yes or no. The position tells you what each answer refers to, and the same idea appears in images, filesystems, garbage collection, database indexes, CPU sets, and CPU instructions.
How Green Tea Made Go's Garbage Collector More Cache-Friendly
How Go finds live heap objects, why safepoints and compiler pointer maps matter, and how Green Tea changes the marking worklist from objects to memory spans.
How we use AI like engineers
Using AI to recover context in large codebases and take repetitive work off engineers' plates without compromising on code and review quality or operational safety.
No Code by Hand
CI dropped from 37 minutes to 9, at 35% lower cost. What we learned about mixing Claude and Codex, clearing the hidden queue, and where the real multiplier came from.
Protecting Our Own Tenant in a Multi-Tenant SaaS
How we treat Diversio's own tenant inside Optimo as the hardest one to reach, using layered controls across Django admin, approvals, Postgres RLS, IAM and automation.
Projects
Products, developer tools, and open-source infrastructure from years of making software.
Cineplex Seat Watcher
An unofficial browser-based watcher for Cineplex ticket releases and seat availability. Alerts run while the tab is open.
TypeScriptPWACloudflare Pages
Microverse
macOS system monitoring with desktop widgets and low overhead.
SwiftSwiftUImacOS
auto-uv-env
UV-based Python environment management for fast local project switching.
ShellPythonCLI
local-ci
Runs repository-owned verification plans locally and publishes GitHub statuses only for the commit that was checked.
GoCIGitHub
agent-skills-marketplace
Reusable coding-agent skills and workflow automation assets.
DocsShellAgentic Engineering
