TesterArmy, a YC-backed startup, is deploying AI agents to automate end-to-end testing for web and mobile applications. Rather than require engineers to maintain brittle selectors and test scripts, the platform lets teams describe tests in natural language and lets agents handle execution, scheduling, and alerting. The company reports it's already caught real bugs—a timezone miscalculation in a booking flow, a checkout regression that threatened revenue, and broken AI tool-calling in a chat interface—across 30+ teams using the product daily. Co-founders say they're tackling the testing bottleneck that's emerged as AI coding tools have made shipping faster; now the constraint is proving your code actually works.

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