Site in magento needs several repairs

I have a website built in Magento which has been presenting multiples bugs since a migration was performed between a cloud hosting offer named Scalaway to Nexecess. These bugs have been affecting performance and basic functionalities. I am looking for a certified magento developer who has time to pitch in and help us urgently, as our monthly profit has plunged drastically. One of the many errors that my website has been showing is that when you click on a product it goes to the homepage instead of the page product. Another, repetitive bug is when you click to purchase a product and it redirects the client to an empty cart. My website has also fallen on its speediness as it may take several minutes to open, and sometimes, it won't open (download) fully. This error has been constant in both desktop and mobile. Currently my website is in Magento 1.9 and it is the base of information to 13 different marketplaces. Thus we need it in order to maintain our stock updated in these many sales channels. We use certain tools commons in my country to connect our website to these market places, for instance Plug2 and Bling. Thus, if you are a certified magento developer and feels that you have the time and the capabilities to help me, please let me know. If you are curious this is my website [login to view URL] I hope to find someone who is interested in helping us, now and in the future. We believe in building partnerships and business relationships which lasts. So, if you are this person, let me know!!!