Experienced Shopify Developer Needed to Debug Custom Liquid Theme Issues and Improve Mobile Layout

I'm looking for an experienced Shopify developer to troubleshoot and resolve layout issues affecting the mobile version of my clothing boutique's online store. The store uses a customized Shopify theme with custom Liquid code, and some pages are no longer displaying as expected on mobile devices. The issues include product category pages and several other parts of the storefront where the layout and theme elements appear broken or inconsistent. I need someone who can work with the existing theme code, identify what's causing these problems, and implement the right fixes rather than relying on temporary CSS adjustments or workarounds. This is an existing, active store, so it's important that any changes preserve the current design, functionality, and desktop experience. I want a developer who understands Shopify's Liquid templating system, theme structure, responsive layouts, and how custom code can affect different page types and screen sizes. The ability to investigate unfamiliar code, trace issues back to their source, and make reliable fixes is particularly important for this project. I'm looking for someone who takes ownership of their work, communicates clearly, and pays attention to the details that matter in a live e-commerce environment. Once the initial issues are resolved, there may be additional improvements and ongoing development work as the store continues to grow. For the right developer, this project could lead to a long term working relationship managing, maintaining, and improving my Shopify store. I'm interested in finding someone I can rely on beyond a single task, so the quality of the work and the ability to work effectively with the existing codebase will be important factors in selecting the freelancer.