Other contributors have said "Did us president jimmy carter help egypt and israel sign a peace treaty?" is the same question as "What did Jimmy Carter do as a President?" If you believe that these are not asking the same thing and should be answered differently, click here
Carter is best known for brokering a peace deal between Israel and Egypt that involved the return of the Sinai Peninsula to Egypt. He is also well known for his weak handling of the Iran Hostage Crisis.
I may not understand your question, but when Carter was president he worked for the US government and received a salary for his work from the US treasury.