Custom Carrier Board Design for Orange Pi CM4

We are looking for an experienced electronics designer to develop a custom carrier board for the Orange Pi CM4, using KiCad as the design tool. The board must integrate the following components and functionalities:

7-inch HDMI capacitive touchscreen display

Analog audio output via I2S DAC with integrated headphone amplifier

Rotary encoder with built-in push button

Analog volume control with on/off switch

Two additional physical navigation buttons

Working Ethernet and WiFi connectivity

Power input via PoE (Power over Ethernet) and/or USB-C (both options must be available)

One accessible USB port for USB flash drive support

Deliverables:

Complete schematic and PCB layout in KiCad

Production-ready Gerber files and BOM

Component selection optimized for availability in Chinese PCB assembly services (e.g. JLCPCB, PCBWay)

BOM with LCSC or equivalent part numbers

Manufacturing documentation ready to upload for turnkey PCB fabrication + assembly

Technical documentation for all connections (GPIO, I2S, power, USB, etc.)

Important Note:
The I2S DAC must include an onboard amplifier suitable for direct headphone output. No external audio hardware should be required.

Follow-up Stage (not included in this post):
A second stage involving remote support for system bring-up and functional testing may be considered after hardware delivery.