Custom Shopify Product Section Build

I have a Shopify store running on a fully custom-coded product section that I recently put together with Liquid, JavaScript, HTML, and CSS. The core structure is in place, but I’d like a seasoned Shopify developer to take it the final mile—polishing the codebase for speed, refining the responsive layout, and tightening the overall user experience so it feels seamless on every device.

Here’s what I need done:
• Review my existing Liquid templates, spot bottlenecks, and streamline them without sacrificing flexibility.
• Optimise the JavaScript interactions (no unnecessary re-renders or blocking scripts) and ensure touch, swipe, and keyboard accessibility.
• Fine-tune the CSS for perfectly consistent spacing, typography, and image handling across breakpoints.
• Build out any small missing pieces we identify together—for example, quick colour-swatch logic or an elegant image gallery—while keeping the code lightweight and easy to maintain.

Deliverables
• Clean, commented Liquid, JS, and CSS files ready to drop straight into the live theme.
• A short hand-off document outlining any new settings added to the theme editor and explaining how to adjust them in the future.
• Brief recorded walkthrough (or written guide) showing key sections of the code so future tweaks remain straightforward.

Acceptance criteria
• Lighthouse performance scores remain in the green on desktop and mobile.
• No console errors in the latest releases of Chrome, Safari, Firefox, or Edge.
• Section runs smoothly within Shopify’s Online Store 2.0 editor with all theme settings functioning as expected.

If you’re confident working deep inside Liquid and enjoy squeezing every millisecond out of a storefront, I’m keen to collaborate and push this section to perfection.