Make change to a custom wordpress website (crypto) -- 3

I need to update an already existing WordPress website. The website has custom post type. The user submit form filling up the CPT. The main feature of the website is the ability to filter through multiple project. We also offer custom alert related with those filters. We need to add more filter to our site so do changes to submiting form, change to our filter system and make sure that the new filter works with our filter alerts. The update will include but not limited: Make changes to already existing CPT and change submit form. Make changes to website design. (On page form submission, instead of a form make a blank listing that user fill up) Create a widget for frontend user to share their listings Make currency conversion (crypto) for a filter system (already working but we are adding currency) Debug Cron Jobs for email sending and daily update of onsite info ***Must be good with API*** This project have multiple task that have to be done. Contact me for more info. MUST SPEAK GOOD ENGLISH / This is not a simple wordpress update, you must be able to go through the previous devs code.