Customise design of Shopify checkout and cart

I am looking for a Shopify expert to customize the design of my checkout and cart. I specifically want to modify the layout and placement of elements to improve the user experience.

Skills and experience needed:
- Proficiency in Shopify development and customization
- Strong understanding of UX/UI design principles
- Ability to work with HTML, CSS, and liquid code
- Experience in customizing checkout and cart designs

I have a design to incorporate into the checkout and cart and can provide this design

Requirements:
- Incorporate my specific preferences for color scheme and fonts into the design
- Ensure that the design matches my existing branding
- Optimize the layout and placement of elements for a seamless checkout process

Please provide examples of previous Shopify projects and any relevant design work.