Arduino SPI

I have a working arduino project that connects to an external device using spi and and uses an unfinished library.

I'm looking for someone who understands SPI and Arduino to write the missing functions from the library to enable me to use this device fully. I have the working library with code, I also have the manufacturer specifications for SPI communication so you can compare what exists with what is missing.

I would also like to be able to connect to multiple SPI devices at the same time.

I can provide a computer in my office with the hardware attached and remote access for you to work on.
I use an Arduino MKRZERO (Samd21) with eth shield and the devices attached via SPI

Objective in short is to Add functionality not currently supported by library to my code and allow me to use 2 of the spi devices at the same time.