Three weeks ago I started turning the methodology behind GitDealFlow into a proper trade book. It shipped today. 104 pages, free PDF and EPUB, also fully readable on the open web. Here is what is in it and why I wrote it. The premise in one paragraph Public GitHub data — commit logs, contributor graphs, dependency trees, infrastructure repos — fires three to six weeks before a typical Series A announcement. The signals are computable from a single free REST endpoint, by anyone, on a $0 budget. The seven-signal stack in the book has a 68% hit rate at a 33-day median lead time on the SSRN-indexed panel of 219 Series-A-bound startups. None of it requires a private network, a paid data licence, or a relationship with the founder. The seven signals Commit-velocity acceleration (14-day window, two-period confirmation, +200%). Contributor influx (4+ new humans in 14 days, 120-day look-back, bot-filtered). Infrastructure repository buildout (Terraform / Helm / runbook / proto / internal-tools).…