We built a fully automated testing infrastructure using three tools in combination. BrowserStack provides the real device testing environment, using actual physical phones and computers in a data center rather than emulators, with full reporting and cross-browser coverage. Playwright handles the automation layer, running test flows with auto-wait functionality and parallel execution across devices. Percy adds visual regression testing on top, comparing screenshots pixel by pixel and flagging anything that falls outside an acceptable threshold, set at 0.3%, which is tight enough to catch real issues while filtering out noise like minor price changes.

The system runs before code goes live. Bugs get flagged early, when they're cheap to fix, instead of discovered later when they're expensive. The whole stack is built to be expandable to other clients with similar scale and release complexity.