When an existing React Native app is failing, the first problem is usually uncertainty. The visible symptom may come from JavaScript state, native configuration, a third-party SDK, an API boundary, or the build and release environment. I will spend up to six hours reproducing and tracing one defined problem. You will receive: - a concise reproduction and root-cause assessment; - a map of the affected JavaScript, native, SDK, API, or release boundary; - a prioritized repair plan with risks and an estimated implementation range; - a written handoff and a call of up to 30 minutes. If one small, low-risk correction is clearly contained inside the audit time, I may include it. Broader implementation is quoted separately so the diagnostic cannot quietly become an open-ended project. I have completed 27 Upwork contracts across React Native, iOS/Android, integrations, refactoring, releases, and urgent fixes. I am also the Mobile Lead and primary mobile-architecture owner for the WEPN React Native application.