Happy Job!
I am a Shopify expert who is well-versed in the Flex theme.
With the flex theme, we now get a lot more control and unbelievable about more of more control than we used to have in any other theme in a Shopify store. So in flex, we can specify more fun sizes, more typography choices, more colors, more options about how things are going to behave.
I can start work immediately and you would get the best result.
Best regards,