PHP Programmer To Take Over My Custom CMS

I had a custom CMS system built for me a few years ago from a company in India. Over the last year there quality of service has really decreased and prices increased. So I am looking to hire someone to make modifications to my custom CMS program. It is not very complex of a program so updates should be easy. This program is the heart of my company so I am only looking for someone with very high rankings that has been in business for several years.