I need a developer who can build a clean, stable Android application that lets users sit for fully-timed mock exams. The core of the project is the timer: each session must start, pause, resume, and submit automatically when time runs out, mirroring a real-world exam environment. For this first release I am only targeting Android, so please use a modern, well-supported tech stack (Kotlin or latest Java with Android Jetpack components). The UI should be lightweight and responsive, leaving room for future additions such as a question bank or analytics—but those extras are not in scope right now. Acceptance criteria • Home screen listing available mock tests • Start screen that clearly shows remaining time once the test begins • Automatic submission when the countdown hits zero • Local storage of user scores so they can review past attempts • Complete, well-commented source code and build instructions that compile in Android Studio without errors Hand-off deliverables: signed APK (or AAB) ready for side-load, full source code in a private Git repository, and a short README explaining the architecture and any third-party libraries used.