Website Maintenance

We need a experienced magneto 2 website developer : we need to redo the current website checkout , to make it more easier for our customers to create orders, need to maintain our plugins , need to know how to correct configure and adjust products and colour filter within the websites, Changing the text and image of pop up adjusting Mobile version of the display of products per row. The issue is sometimes is 1 per row or 2 per row which is wrong , and it leaves blank spaces. It should 2 products per row in a mobile view. We will also give yougeneral maintain work to do on the website as well. Everything you do HAS to be well documented , both UI and backend code base wise. Things needed to complete: Redo the website checkout to make it more user friendly When redoing the checkout - it should allow users the option to checkout/pay as guest When the shipping address is United Kingdom then the customer should be allowed to select from the static / fixed value prices but if the shipping address is not United Kingdom then it should use the dhl Integration config that is already been installed in the website to display the shipping cost options. Customers should be able to pay by credit/debit card (saying on the website page) or pay by paypal which means they are redirected to paypal to pay. The checkout process should also should not break the other features we have regarding the checkout like the affiliation plugin we have installed and the magneto shopping carts rule (discount codes) When the customer pays , the screen should clearly show the receipt information and the product/s brought by the customer and the purchase email should be sent to the customer as well. ----- Colour filter on the product category page should be fixed - when you click on grey colour then you should only see grey coloured products -------- Product detail page, cart page and check out page - when a customer goes into a red product , but the customer selects the blue colour product from that same product detail screen and adds to cart - the correct colour product and information should be detailed in the cart and checkout pages. ------ Mobile responsiveness : For the mobile view - display 2 products per row in all product category pages. The issue is sometimes is a customer will see 1 per row and then the next row down is 2 per rows, which is wrong , and it leaves blank spaces. It should 2 products per row in a mobile view.