Bluetooth Digital Water Level Meter Creation

I'm in need of an experienced IoT electronics engineer who can design and build a Bluetooth LE enabled digital water level meter for measuring freshwater tank levels in real-time.

Your main task scope is:

1. Use domestic grade float sensor switch for fresh water with upto 6 float switch sensors to detect water levels.
2. Use ESP32+BLE based hardware controller (with 2 AA/AAA batteries). Use power optimized and mesh networking modes
3. 2 LEDs to indicate error, power, scan and broadcast
4. Use simple BLE scanner mobile application to receive BLE GATT broadcast packets.
5. Frequency of broadcast depends on the rate of increase or decrease of water levels. Frequency will be from 1 min to 30 minutes
6. Demonstrate that packets are received real-time on mobile app

Deliverables:
1. Wiring diagram
2. Float sensor switch make and model chosen for demo
3. Hardware controller with modules, if any. Device should work in a BLE mesh and for a distance of 30-100 feet
4. Source code and documentation including installation document
5. Demonstration

Ideally, you will possess:

* Strong experience in electronics engineering and Bluetooth BLE technology
* Proven knowledge of water level measurement techniques