This can be done easily. You weight scale would be required to connect to a micro-controller and Bluetooth module (HC-05).
Relevant Skills and Experience
Micro-controllers, Bluetooth, Android, cloud, IOT, Embedded, end-to-end products
Proposed Milestones
₹13333 INR - Provide a weigh scale with a AVR micro-controller + bluetooth (in a separate small box), android app
Are you looking for a finished product or a POC kind of device to verify your idea?