Two engineers rebuilt a FedEx-scale delivery system core in 3.5 months with AI
alex_verem · x · 2026-09-03
An engineer details rebuilding a delivery orchestration platform serving FedEx-scale operations: officially estimated at 7-8 months, done in 3.5 months by 2 engineers with 122 merged PRs in the first 90 days, live in production by month 6.
Key points:
- Brownfield, not a weekend prototype: real logistics operations, billing shippers and paying couriers, with real consequences for breakage.
- Week one involved no code: they scanned the entire repo and built a knowledge graph of markdown files documenting every module, dependency, data flow, and domain.
- The author argues "we used AI and it was faster" helps no one; the method matters.
A rare full postmortem of an enterprise-grade AI-assisted system rewrite.
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