Senior Full Stack Developer | Laravel | React.js | Python | AWS

I need to build a real-time message relay. One side is a simple web portal (React) where a user types a message and toggles an 'Urgent' switch. The other side is a dedicated Android e-ink device that needs to receive that message instantly. If the 'Urgent' switch is toggled, the receiving side must override system volume, play a loud tone, and flash the screen, even if the device is asleep. Can you handle building both the web interface and a basic background Android application (APK) to achieve this, or is your focus strictly standard web browsers?