Shopify Developer Needed – Custom Kit Builder + Preorder Logic (Fitness Equipment Brand)

Overview We are a fast-growing fitness equipment brand on Shopify and are looking for an experienced Shopify developer to build a custom kit / bundle builder directly on our product pages. This is not a basic bundle app setup. We need a clean, scalable, custom solution that handles mixed inventory states (in-stock + preorder) while ensuring accurate SKUs and line items for fulfillment. What We Need Built 1. Custom Product Kit Builder Customers can select different options/components to build their own equipment kits Options may include: Different hardware variants Add-ons Accessories Each selection must map to a specific product variant / SKU 2. Preorder + In-Stock Logic Some components may be: In stock On preorder The product page must: Clearly display preorder messaging (ETA, notice, etc.) Accurately reflect mixed availability if a kit includes both in-stock and preorder items Preorder items must: Still be purchasable Flow correctly through checkout Appear clearly on the order confirmation and admin side 3. Accurate Line Items for Fulfillment Orders must show: Each selected component as a separate line item Correct SKUs for every item This is critical for: Warehouse fulfillment Partial shipments Backorders / preorder tracking 4. Shopify Best Practices Clean, maintainable code Works with: Shopify Online Store 2.0 Shopify checkout Must not break: Inventory tracking Order exports Fulfillment workflows Technical Expectations You should be comfortable with: Shopify Liquid JavaScript (front-end logic) Shopify product variants & line item properties Custom bundle / kit logic (not just off-the-shelf apps) Preorder workflows in Shopify SKU mapping and inventory handling Experience building: Custom product configurators Bundle/kit builders Complex variant logic Experience with fitness or physical products UX-focused solutions that are clean and easy for customers Deliverables Fully functional kit builder on product pages Clear preorder messaging on the frontend Correct SKU + line item structure in orders Documentation or handoff explanation of how it works Ability to support testing before launch How to Apply Please include: Examples of Shopify stores where you built: Custom bundle builders Product configurators Preorder logic A brief explanation of how you would approach this build Your availability and estimated timeline Someone who understands fulfillment and inventory complexity ⚠️ Important If you only use basic bundle apps or cannot handle mixed preorder + in-stock SKUs, this is not the right project. Apply tot his job