Hello Sir,
i had 6+ years of experience in embedded and iot system development. i have been working with nrf52 Series SOC's from the beginning of my carrier. i had experience in library/driver development too.
Driver API's will be
1. SPI => init, transeive,
2. UART => init, transeive, rxCallback,
3. ADC => init, seqCompleteCallback,
4. BLE ADV => init, start, stop, update
looking forward for have a detailed chat with you