You will find details on the evaluation process in the Guide for Applicants. The evaluators are experts (=researchers) in the field. They will be matched to your proposal according to their profile and to your abstract and keywords. They will for sure be in your general research area, but might not be in the exact same field that you are. It is not possible to find out who evaluated your proposal afterwards, but you can find a list of former evaluators here on the Participant Portal in the "Reference documents" section (you have to scroll down to the "Expert names"-folder).
Every proposal is read and evaluated by three independent evaluators.