Notes from the teams building B3 — on the systems, decisions, and trade-offs behind the product. Deep dives on distributed infrastructure, performance, tooling, and the craft of shipping reliable software.
01 — Open Source We built a component library and then asked what happens if AI can extend it as well as a human contributor can. The answer changed how we think about library design, documentation, and the future of open source maintenance.
02 — Performance How we used optimizePackageImports, modularizeImports, and strategic dynamic imports to shrink a Next.js 15 app down to fit comfortably inside Cloudflare Workers limits — and what we learned about icon libraries along the way.
03 — TypeScript A practical walkthrough of the breaking changes in Zod v4 — error shape rewrites, enum errorMap, record types, and the mechanical steps that got us through a 23-file migration without a single regression.
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