Hello,
We have great experience with Prestashop and we can redesign & improve your website.
We work with CMS Prestashop,Wordpress, Opencart, Php, JS, HTML, CSS, Bootstrap, MySQL, etc. You can see our profile here https://www.freelancer.com/u/Webln .
Please, show your website. And let's chat about improvements.
With regards,
WebIn team.