Simple USB Audio Interface Project and PCB realization

I am looking for a freelancer who can help me with a simple USB audio interface project and PCB realization. Here are the details:

Desired Audio Input/Output Interface:
- The desired audio input/output interface for the USB audio interface is 1/4" TRS.

Specific Requirements/Features:
- I am open to suggestions and do not have any specific requirements or features in mind. I am looking for an experienced freelancer who can provide suggestions and recommendations based on their expertise.

Budget:
- My budget for the USB audio interface project is between $100 and $500.

Ideal Skills and Experience:
- Experience in designing and developing USB audio interfaces
- Knowledge of PCB realization and manufacturing
- Familiarity with 1/4" TRS audio connectors and their implementation in USB interfaces
- Ability to provide recommendations and suggestions for features based on the client's needs and budget

If you have the necessary skills and experience, I would love to discuss the project further and explore potential solutions.

I will upgrade this project step by step
Please check the attached pdf