Check the website thoroughly for errors and issues

First of all, we will release the amount only after you hand over the project and after we checked it thoroughly. Need freelancers who do not ask for the advance. We are looking for experienced Magento developers only who are certified (preferable). You need to work on finding and fixing the issues on the website, you may need to make few extension (which we already have) compatible with our template or store, removing unnecessary extensions, check the website thoroughly for the issues. You may or may not (if we create a new folder or copy everything in there) create a new folder and copy everything in that folder and start your work from that folder only. You will get the access to that folder only. Need freelancer who can work give his/her time to our website only as we need it urgently. The issues are:- 1. When we log into the website and go to my account or come out of my account so it shows someone else's name instead of our name. 2. Removal of few extensions carefully. 3. Currently, when we add the product to the cart and proceed to the cart so it is not showing the cart page, showing blank white page. 4. Make third party extension compatible to our website, currently, shipping modes are not coming in that extension but coming in the default checkout of our theme. 5. Check the website thoroughly for issues and error and fix them. Thank you!