Software Test Engineer Mobile Test Engineer: Focuses on testing apps for Android and iOS platforms. Web Test Engineer: Specializes in testing websites and web applications. Client/Desktop Application Test Engineer: Focuses on testing PC desktop software (e.g., applications on Windows or macOS). Backend/Server-Side Test Engineer: Focuses on testing the performance, functionality, and stability of APIs, databases, and server logic. Hardware Test Engineer Responsible for testing physical devices like mobile phones, computers, routers, chips, and smart home devices. Involves circuits, signals, power consumption, and reliability.