eCommerce site (Java based) improvements

We are a small wholesaler that only does B2B. We are looking for an experienced full stack Java developer to take our Java e-commerce site (which is a Maven project) to the next level. The goal of this project is to add the following enhancements to our site: - Enable customers to place future orders. Now, they can only place orders for the following day. - Listing of items on each product page (there are three pages) must be layed out nicely. I will provide a couple of example sites. - Replace the current Paginator with a modern one so that its clear and visible. The Paginator must be position on the top and bottom of each page where it's needed. - Add a sort oder menu Price, low to high Price, high to low Alphabetically, A-Z Alphabetically, Z-A - Adding items to a cart must be easy and quick. Now, customers need to click three times to add an item to the cart. I will provide a couple of example sites that have this feature. - The checkout process needs to be improved. The number of steps to checkout need to be reduced. - Display the number of items in the shopping cart and total amount in the main menu. I will provide a couple of example sites that have this feature. - Add a self service password reset solution on the login page - Improve the existing customer profile. a) Enable customers to change their passwords. Now, they need to call Customer Support for this. b) Enable customers to change their email address which they use for login b) Enable customers to download order history in PDF format - Change a session timeout to 8 hours and display a window that shows how much of time is left for shopping - Make the site responsive and mobile friendly - Fix a Java error that is sometimes triggered during the checkout process Error messsage: [login to view URL] Our e-commerce site is running on Tomcat servers and using APIs it gets the product data from a DB2 database which is running on AS/400. Web Server: Tomcat 8 Web: HTML, CSS, JavaScript, jQuery v1.11.3 Application: Java, Hibernate v4, Spring Framework v3.2.16 Back end: DB2 on IBM i AS/400