Dear,
I hope you are doing good.
Thanks for sharing your requirements, I have gone through the requirements and I can work with you. As you asked to complete this in 20 hours, that would depend on how much work is required. How do you plan to do this? Are you planning to do upgrade on some testing server or on your live website?
Let me share with you about myself, I have more than 10 years of experience in developing websites and complex web based systems/ customized legacy applications.
My area of expertise includes PHP/ Mysql, Core PHP (No Framework), Mysql, Customized MVC Frameworks, Laravel, CodeIgniter
If you would like to discuss anything further with me, feel free to contact me.
Regards,
Abid Ansari