With over 10 years experience with PHP and MySQL, I can develop your calculation plugin for wordpress. I also work with HTML, CSS, JavaScript, AJAX, jQuery and the CodeIgniter framework.
I am the type of developer that likes to throw out ideas to make projects better. If I come across something I do not know, I research, learn it and then put it to use on my client's projects. I usually put in 10 hour days and work weekends to meet deadlines. I report to my client frequently about the status of their project so they are never in the dark knowing whats going on with their project.
If you have any questions, please feel free to ask. Thank you for your time and good luck with your project.