Refine the site on opencart

As a long-term cooperation I am looking for a programmer who will carry out the current improvements for the site fyrfyr.ru

Today, the site needs:
1. In the side menu of the catalog, make sure that the categories of the third level were rolled up and unfolded at the click.
2. It is necessary that in the form of a subscription the client subscribes to the mailchimp. Or there was the integration of the list of signatories to the mailchimp.
3. You need a module to package discounts on different product groups. So that you can assign a single discount on the whole group of goods "circles"
4. The side menu does not fit 3 levels, you need to fix
5. You need to install a module that automatically throws goods from the site into goods in the KK.
6. It is necessary to make it so that you can give a coupon not only for a discount, but also for a gift. When buying from a certain amount or if the completeness is certain at the purchase
7. You should add the choice of payment: cash when receiving, card when receiving or card online. But without the integration of payment at once - until we have correct data are on the availability, managers will put references to payment
8. It is necessary to eliminate problems with the download speed of the site listed here: developers.google.com/spe...

The cost of work is being discussed. Installed in the post - just to place the statement