Data Signal Processing Board

I'm looking for an experienced electronics engineer to design a circuit board.

I'm creating a conversion kit for Amazon Alexa Echo
It's going to add a 4'' woofer, a solar panel for charging and a battery for remote use.

The circuit board will need to power the additional woofer.
Have a built in cross over.
Have the ability to charge a battery from a wall plug and a small solar cell when operating remotely
Have bluetooth capability to sync with Alexa or other blue tooth speakers

Im looking for a rough price to create this product.

Ideal skills and experience:

- Electronic circuit design proficiency
- Experience with digital signal processing
- PCB layout and fabrication knowledge
- Familiarity with standard digital data protocols
- Strong problem-solving skills

Project requirements:

- Develop a signal processing board for digital data
- Ensure the design is optimized for power efficiency and performance
- Provide documentation for the design and testing strategy
- Consider future scalability and integration possibilities

While I'm unsure about the need for specific audio connectors, I am open to recommendations on standard integration options to ensure versatility and connectivity of the circuit board.

Let's create a cutting-edge solution for processing digital data signals!