Urgent Shopify Theme Customization & App Integration

We are seeking an experienced Shopify developer to resolve issues on our site. Immediate availability is required, and the project must be completed within 2 days.

Tasks include:

Fixing variant selection issues on product pages.
Optimising image loading and visibility for product media.
Mobile Product Page and Product Quick View: Ensuring that only mockup images and the selected variant image are shown when sliding through product media. Thumbnails should always correspond to the displayed image.
Enhancing header menu functionality (image management, text styling, label customisation).
Implementing an accordion-style mobile menu with animations and custom styling.
Performing a Shopify theme template update and ensuring the site remains fully functional post-update.
Addressing console errors shown in Inspect.
Ensuring all changes are made without introducing new issues or bugs.
Requirements:

Proven experience in Shopify theme customisation.
Ability to troubleshoot JavaScript errors.
Experience with Shopify template updates and ensuring smooth functionality afterward.
Immediate availability to start and complete tasks within the given timeline.

Please respond with examples of relevant work and your availability.