PHP File changes and additions of some new functions

I need a PHP developer to add few ogical funtions etc in one of my PHP project.
Need to work online on server remotely.
No server aceess directly will be provided nor the files / project will be shared

Ideal skills and experience:
- Server management skills
- Proficiency in PHP encryption
- SQL knowledge
- Experience with debugging logical errors
- Familiarity with the specific PHP file structure I am using
- Ability to deliver quick and efficient solutions

Please share relevant experience in your bids.