Shopify is the weapon of choice for merchants who require a rapid time of deployment to market, but may need something beyond a vanilla off-the-shelf platform. That is to say that it does have the capacity to customise, to integrate with other systems, to apply a variety of 'skins' to alter its look-and-feel in line with your corporate branding.
It is very much, however, on a Software-as-a-Solution basis, hosted entirely on their infrastructure, which you can ramp up and ramp down as you require. Given that it is an under-one-roof solution, there is less configuration, less in the way of development and code customisation.
It is ideal if what you're looking for is functional simplicity and rapid time to market.
If that's what you're looking for, we can help you with that.