Wordpress, woocommerce Expert, custom calculator plugin fix (re-create)

**PLEASE READ IT CAREFULLY BEFORE BID** I have printing websites and they have custom instant price calculator. Unfortunately, it is not update friendly, and no latest woocommerce friendly. Fix the calculator (It should be compatiable with latest woocommerce and all new updates) If making new plugin, it should be user-friendly, easy to add, remove attributes/ variations/ values for existing and any new products if needed. We will not do data entry again, if you can take database of the current calculator attributes and make it work with your custom created one. that's your choice & expertise. Website needs to be compatiable with latest PHP 7.1, 7.2 Clean all Bugs and remove unnecessary Plugin’s Improve the page loading speed (4-5 sec is ideal) Its should be http & https friendly. Mobile Ready version (Mobile, Tablet, Desktop) already responsive but need to check all, Should not have any issues at all. if found any issues, needs to be fixed. Check full order process, Cart, Checkout, Upload Artwork, Payment. Customer should be able to upload multiple files during check out. Also Large file acceptable. Checkout process should be similar to (reference site will be provided) UPLOAD ARTWORK & ORDER NOW next page upload artwork, same page as reference site above. Whole checkout process is required to be redesigned as per reference site. Click on My account should work like reference site above. Admin should be upload custom order/quotes to customer account from admin panel. We had issue in our website some days ago "Deceptive site ahead". had to look in to that as well. to fix it. I think our current theme is quite older version, it probably is cause of the Deceptive site ahead. You can update the theme if you like, but we do not want our current design changed at all. It needs to look like as it is right now. Note: We have dozens of website which have exact same calculator installed. If you fix the problem on one website, you will be given all websites to get fixed. Couple of sites needs to be redesigned (theme) so all projects will be given to the hired candidate. So you must be fully expert of wordpress, woocommerce, custom plugin's, theme redesigns etc. Everything else in the website is working perfectly fine. in check out using CC details etc. And when order comes, full details in the email admin everything is working fine, and updating calculator, woocommerce should not effect any. Thank You