Long-Range RF System with Atmega328P

I am looking for an experienced freelancer to in developing a complete solution for RF data transmission using the Atmega328P microcontroller and UART communication. The objective is to transmit HEX data wirelessly over a distance of 100 to 500 meters. I require the design and schematics of the circuit for this project.

Project Scope:

Circuit Design & Schematics:
Complete design including the Atmega328P microcontroller.
UART setup (TX/RX pins) for communication.
Integration of RF transmitter and receiver modules (e.g., 433MHz RF module or nRF24L01).
Ensure power management and signal integrity for RF transmission over long distances.
Communication Setup:
UART communication for receiving HEX data on Atmega328P.(Need to get the data from UART and simultaneously transmit via RF)
Transmission of the received data via RF module over 100-500 meters.

Key Requirements:

Experience with Atmega328P microcontroller.
Proficiency in designing UART communication.
Skilled in RF signal transmission and long-range data communication.
Ability to provide detailed circuit schematics.