Fix bugs and make minor site improvements (Core PHP full stack web app)

I am looking for a skilled developer to fix bugs and make minor improvements to my Core PHP full stack web app, located at [login to view URL] 1. I have an infinite scroll capability but when I am using my mobile browser there's a weird glitch when I leave the site and come back to it. As I start scrolling, I see a duplicate of the listings which is really annoying and needs fixed. 2. Don't like some UI elements that the previous developer added, such as some icons that look low res and the mobile menu design. Need these to be upgraded and modernized. 3. I want to add a new landing page that I can use as a marketing funnel (screenshot attached). 4. The like functionality needs some work. It currently can log the number of likes and save it for each user based on their IP but I notice sometimes when I come back to the site or refresh the page the save disappears 5. My site is mobile optimized but when you go into the user dashboard we had to set the order of field elements in a way where First Name and Last Name come in the correct order on mobile, but by doing so it's not in a normal order on desktop side-by-side. Would like this fixed if possible. 6. I want to change one of the fields on the user dashboard from Instagram Handle to a dropdown of eCommerce platforms so I know what each seller uses (WooCommerce, Shopify, etc). Will need this data updated in my admin panel. 7. I want to change my domain from [login to view URL] to [login to view URL] and also update a couple places on the site where my email is still using the old domain. Must have SSL certificate for the new domain in place. 8. I have payment API integration with Stripe, and everything is set up correctly, however I don’t like the checkout form that is used for credit card details. Would like a more modern looking form that is mobile friendly as well. 9. Small table format fix needs made in my admin panel, and also need to fix a bug that rounds up product prices to the nearest whole dollar amount 10. Need you to check the scalability of the site so when I really go big with marketing it can handle the traffic (currently hosting the site with Hostinger). Not sure how good Core PHP is, and I regret not having it built using a framework like Laravel. Any upgrades you can make to ensure smooth, reliable performance for hundreds of sellers and potentially tens of thousands of monthly site visitors would be beneficial. The ideal candidate should have experience in handling functionality issues and user interface enhancements, specifically using Core PHP. Specifically, I am experiencing functionality issues with my web app that need to be addressed. Additionally, I would like to see user interface enhancements to improve the overall user experience. I have a tight deadline for the completion of these bug fixes and improvements, requiring them to be completed within a week. Skills and Experience Required: - Strong proficiency in Core PHP and full stack web development - Experience in fixing functionality issues - Knowledge of user interface design principles and ability to implement user interface enhancements - Time management skills to meet the tight deadline Reply with READY so I know you read the requirements.