Develop a Mac app to run on 10.10 like MAMP, except using NGINX instead of Apache.
It'll need to have some clever configuration options, a PHP version picker, define ports, a visual display of what servers are running or stopped, allow the user to define where the web directory should be, change/control the MySQL root password, provide a phpMyAdmin page and other useful features.
I would recommend downloading MAMP if you don't have experience with this.
This is a complex project and thus payment will only be released when I am confident the app is complete.
There'll be on-going maintenance & updates work if the bidder is successful.