A php expert who will check and fix-modify (not develop) a set of functions for a word press site.
He/she will either get the template files and database schema so to work on his/her server and deliver the correct files or debug the files and solve the issues.
The freelancer has to deliver a clean, free of hassle solution (no need for updates, future involvement).
The full release of the amount, only after the successful test and operation of the solution.
Needs to know mysql, soap, xml