Hello, I am an expert in Prestashop until version 1.6. If that is your version and you want a professional development you can contact me at any time, so we can talk about the details, tasks to be performed, final cost and development time.
I have more than 10 years experience in software development as a Senior Computer Engineer, Senior in PHP + MYSQL, HTML5, CSS3, Javascript and System Administration (LINUX Apache server), so If you have no error shown using error reporting I can check server logs in order to find out what is the reason of your errors and then fix them all.
I dedicate myself daily to the maintenance and development of online stores, I can modify functionalities, create modules, optimize and improve the performance of your website, as well as modify the theme and all the visual aspects that you need. I make all the changes with guarantee of operation and to be preserved despite the updates.
Regards.