Legacy Codebase Recovery — Inventory System

A logistics business relied entirely on an inventory management system with no documentation, no source control history, and an original developer who was no longer reachable. A critical stock-sync bug was causing incorrect inventory counts across warehouses.

Reverse-engineered the application logic from compiled and minified source, rebuilt a working local environment, and traced the sync bug to a race condition in a batch update routine. Restructured the affected module with proper locking and added regression tests.

Stock discrepancies dropped to zero within the first sync cycle after the fix. The client also received a written technical map of the system so future changes don't require another recovery effort.