Do a wordpress custom plugin

I'd like to offer a complete wordpress custom plugin at a cost of $450. You'd enjoy seeing following features.

a) Wordpress Configuration Setting up.
b) 100% hand coded programming for proper functioning of browser compatibility and site load speed optimization.
c) Suggestion of better tools for improving UI of plugin
d) Social Media Integration
e) Functionalities are clarified during initial scope of the project
f) 8+ years of experience in wordpress development.
k) Developed more than 15 custom plugins during this period

* Tenure : Your reference websites are highly appreciated! (if any)
* Well defined scope of the project talks about the various functionalities of the website whether there is any you do like to add on.
* Availability & Accessibility : Round the clock support and you may access from Skype, Phone or Email as on your convenience.