Site Magento ecommerce

Looking for somebody reliable to build a responsive magento site based on the template from underneath, as example you can check microspot.ch/ for headertype zalando.ch. Our needs are: 2 languages - german-english, on checkout card payment via Visa/mastercard/Paypal/Twint. The products in a category will be from different suppliers, which we need to calculate income per merchant at the end of the month. Furthermore the checkout has to be customized with a merchant checkbox (details provided at later point). Beside the logo in the same line should follow searchbox - account login or creation basket . adminpanel ghas to be customized for 1 suplimental user( client) to be able to modify products etc but have no access to the essential konfig. Furthermore it should be possible to make a 1 button backup/restore for the whole site as it is possible in joomla with akeeba.This as a first info, for more details or questions about please feel free to ask anytime.