Full-Stack Developer Needed: Fix Shopify Theme Script & n8n Automation Conflict

We run an automated custom product fulfillment flow linking Etsy to Shopify via n8n, and we are experiencing an intermittent session/caching bug on our custom design portal page (/pages/design-portal). The Issue: When an Etsy order is generated, our n8n workflow emails the customer a direct link to a Shopify portal page embedded with query parameters (?etsy=123&t=token). A custom-coded performance optimization script on our theme is creating a race condition/session conflict. On load, the customizer script successfully reads the parameters, but upon clicking "SUBMIT DESIGN," the script occasionally loses context, drops the external routing, and defaults back to the native Shopify cart flow—failing to attach the design to the backend order. Clearing cookies/using Incognito temporarily resolves this, pointing to a state-management or network timeout issue. Required Skills: -Expert-level JavaScript (DOM manipulation, session storage, handling async race conditions) -Shopify Liquid theme development -n8n workflow architecture and webhook optimization -Experience with Etsy/Shopify API integrations Scope of Work: 1. Audit the submission JavaScript function to ensure it forcefully overrides cached states/cart sessions and handles backend response delays cleanly. 2. Hard-code full stability for mobile in-app browsers (WebViews), where the link is most frequently opened. This is a quick project for an expert who understands both sides of the coin (Shopify Frontend + n8n Backend). Looking to get started immediately.