I need a developer who knows BigCommerce inside-out to extend the store’s core functionality. The immediate focus is shipping logic: I want new shipping methods added, existing rates adjusted, and clear zone-based rules so customers see the right options every time they check out. Changes must be configured in the control panel rather than hard-coded, so I can edit them later without touching code. Alongside shipping, product pages require more flexible variations. Think custom option sets that handle complex combinations cleanly, keep inventory in sync, and present a smooth selector on Stencil templates. Deliverables • New shipping methods visible at checkout and in the admin panel • Rate tables updated and verified for accuracy across all defined zones • Zone configuration documented so I can tweak it in future • Enhanced product variation logic live on a sample SKU and ready for me to replicate Acceptance criteria: everything must deploy on a staging store first, pass a test order for each zone and variation set, and then be promoted to production without downtime. If you have proven experience with BigCommerce APIs, Stencil, and shipping rule configuration, let’s get this done.