Arduino PID expertise needed

I’m looking for a programmer to assist me in completing a project on a wakeboard boat.
I have an engineered prototype installed and working with basic programming but needs to be rewritten as a PID in order to work properly. It is to do with engine control and currently suffers from hysteresis.. but essentially all the engineering is done....I’m happy to pay for the time... around west London area would be helpful.. will involve fun days out on the boat to test project, have a ride etc

There is a PID library available for Arduino. No need to build that part yourself.