I need a professional website designer familiar with opencart to do custom changes

General information for the website: we sell fashion jewellery and fahion accessories
Kind of development: Customization of existing website
Description of requirements/features: This job would fit who already works with opencart and have modules upgrades

Currently my opencart ecommerce is using version 1.5.6.4 .
I need you upgrade it to the latest seo advanced plugin WHICH YOU HAVE TO PROVIDE.

To fix my checkout, products can be added to basket but cannot checkout. It remains on basket page and page refreshes every time you press checkout.

To move categories text to bottom of page and change all subcategories to a scrolling gallery

Check and add google analytics and webmaster,. Remove all dead links and 404 links to divert it properly. and check wc validility and fix it all.

check woorank and fix all issues

set up email with signature and check email and when orders are received proper notification is given when customer places an order. Make sure customer receives email or notification as well.
make sure after placing order and checkout customer is returned to our website and there is a thank you page.

In opencart admin section its denying access to products and making changes to products and other categories check and fix all related queries.

In sql database there are two scripts that is giving too many usage out optimise the database so its more efficient remove al excess tables and duplicate data.

Optimise website so in all browsers its working more efficiently and its optimised so loading speed is faster.
off line optimisation on website.

A couple more things

A chance of continue using your services for ongoing SEO optimisation for three months to rank my keywords to page one of google yahoo, bing.