The first monorepo I worked in had 12 services, 4 shared libraries, 3 frontend apps, and a tooling directory that nobody understood. My first week, I spent four hours hunting for the right place to add a new shared utility. I added it in the wrong package. The CI build broke. A staff engineer rewrote my PR with a polite comment that said "monorepos take time to learn." That comment is technically true. It is also a graceful way of saying "you wasted a day because you did not understand the layout." Six months later I run an 80,000 file monorepo as a solo founder. I add new packages, refactor across boundaries, and ship multi-package changes with confidence. The thing that changed was not my memory. It was my workflow. Claude Code reads the dependency graph, plans changes that respect package boundaries, and catches violations before CI does. Here is the system. Why Monorepos Are Hard A regular repo has one source tree. You can hold its shape in your head. You know roughly where things live.…