Greetings,
A really cute and interesting product. If you are replicating TapTap, it is a quite involved product - BLE (to connect to mobile), GPS (location sensing), IMU (movement sensing), Touch sense, Motors (Vibration), Rechargeable battery management being the major things involved in a really small form factor. For direct long distance mode it might need GSM as well. Then it has to go through the entire product cycle - circuit design, layout, fabrication, assembly, firmware, testing, App integration. So overall a full fledged product design is what we are talking here.
I have the relevant experience & expertise in such products. Please see my profile/portfolio for details. It would be fun and challenge both to do this project. However as I said it's quite involved - it will take time and effort and we also need to chalk out the scope in more detail. Let me know if you would like to discuss it further.
Look forward to hear from you.
T & R
Alok Pugalia