Work with a website on opencart

Need to repair a few places on the website:

Basket (was crookedly displayed in the mobile version there is no possibility to change the number of products).Blog. Do not pull images that inserted in the article and appears not standard. Need to make a quality standard blog on the website.The speed of the website. Stars in the sky dont ask, but the green zone (in mobile and desktop versions) PTS want.

A very important thing: guarantee that you will not leave us half way. Burned, very unpleasant.

In short we need an honest, fair special, you can rely on.