The OS Release QA Engineer will be responsible for manual functional testing of first-party applications on iOS and macOS. This includes designing and implementing test plans, test cases, risk analysis, and integration testing across Apple platforms. The engineer will identify, escalate, and communicate key build quality issues, working towards resolutions. They will also conduct end-to-end testing of software features across multiple platforms, design and review tests and coverage plans, and perform system and integration tests. The role requires strong technical and communication skills.