Bhavesh Singh

Bun was rewritten from Zig to Rust in a million-line PR. The interesting part is not the languages, it is the workflow: 64 Claudes running one implementer, two adversarial reviewers and one fixer.

A week learning end-to-end testing, and the library that made it click: Stagehand lets you write test steps in plain English, so an AI reads the page and figures out what to do.

Three ways to cut a document for RAG — text splitting, semantic chunking, and contextual chunking. Same document, three cuts. Only the last one stops the retriever from lying.