Create a mobile version of the site

You need to create a mobile version of the online store. The online store is made on the Joomla engine. It is not an adaptive template that is needed, but a mobile version on the subdomain. So. Joomla is already very heavy even for computers, and the mobile version should be as light as possible. Without any bells and whistles, heavy pictures, sliders, etc.

The usual template is optimized for at least 800x600px. The mobile version should support resolutions up to 800x600px. And if a person comes to the full version of the site with a resolution of less than 800x600px, then he should be transferred to mobile.

Please provide a portfolio so that I can choose a candidate.