I need a Shopify Developer for small modifications

Hello I have several modifications to be done on my site: - I want a "slideshow" of pictures in my product pages instead of all variant pictures below the principal picture, in desktop and mobile version of my site. For desktop, using arrows to show following pics and for mobile version just "sliding" your finger to show next pics. (see "current slideshow" from my current site and "new slideshow" jpegs, what I want). - I want that product description and reviews appear below principal picture and using tabs that appear if you click on it (see "open tab" and "close tab" jpegs). For mobile, I want description tab first, then reviews tab next. For desktop version still don't know if I want same than mobile version or your comments are welcome! - then, some minors modification like taking out blank space that exist on product/collection pages (mobile and desktop) between text or picture and header. Don't hesitate if you have any questions. Thanks for your answer, Katy