Native Android Interval Timer (MVP)

I am evaluating the development of a simple Android MVP for a gym-focused timer app. The core concept is intentionally very simple: - the user selects a time interval, for example 60 / 90 / 120 seconds; - chooses the alert type; - presses Start; - the app automatically plays a beep and/or vibration at every interval, without requiring any further interaction. The goal is to allow the user to keep the phone in their pocket and maintain a consistent training pace with minimal distraction. Key technical prerequisite before full development: the project should first pass a functional test proving that the recurring alert works reliably with the screen locked/off and the app running in background for an extended period, also considering Android battery optimization and background execution limitations. For the MVP, the main requirements are: - Android app; - minimal and intuitive interface; - preset intervals + custom interval; - Start / Pause / Stop; - countdown to the next alert; - beep, vibration, or both; - optional pre-alert before the main signal; - reliable operation with screen off and in background; - user preference saving; - basic analytics to monitor usage, sessions and retention; - architecture ready for future Premium features; - multilingual structure, initially possibly only English and/or Italian. No user accounts, cloud sync or complex features are required at this stage. The objective is to launch a reliable MVP quickly and validate the market. It is also essential that the source code, repository, project files, Google Play account, Firebase account and any servers/services used remain under my ownership, with the developer added only as a collaborator where needed. I would therefore like to receive an estimate covering: - MVP development cost; - estimated timeline; - proposed technology stack; - any recurring costs; - post-launch support; - pricing/model for future app updates and feature development. Confidentiality and ownership note: all information, functional concepts and project materials shared must be treated as confidential and may not be disclosed, reused, copied, resold or used to develop a competing or substantially similar product without written authorization. A specific NDA and software rights assignment agreement may be signed before development begins. The attached image helps illustrate the interface concept (even though this app is different). Launch app -> set duration (60s, 90s, 120s) -> set alarm type -> start.

Project ID: 40749140