Amazon SP-API Expert Needed for Inventory, Orders, Returns, Reimbursements & Sync Architecture

We are building a SaaS platform for Amazon sellers using Lovable and are looking for an experienced developer who has successfully implemented Amazon Selling Partner API (SP-API) integrations at scale. This is NOT a simple API connection project. We need someone who deeply understands Amazon seller operations, data synchronization, rate limits, report processing, and building scalable systems similar to Helium 10, InventoryLab, Sellerboard, or SellerAmp. About Our Platform Our software helps Amazon sellers manage: * Inventory * FBA Inventory * FBM Inventory * Shipments * Orders * Returns * Removals * Reimbursements * Recovery Claims * Advertising Data * Repricing * Restock Recommendations * Profit Analytics * Work Orders / Purchase Orders * Amazon Account Health Monitoring Built using: * Lovable * Supabase * Amazon SP-API * AI-powered operational workflows ⸻ What We Need We need an expert to: 1. SP-API Architecture Review Review our current architecture and recommend: * Best synchronization strategy * Polling vs Report-based approach * Incremental sync design * Data caching strategy * Rate limit management * Multi-account scaling 2. Amazon SP-API Integration Connect and optimize: Inventory * FBA Inventory * Reserved Inventory * Inbound Inventory * Inventory Ledger * Stranded Inventory Orders * Orders * Order Items * FBM Orders * FBA Orders Returns * Customer Returns * Return Requests * Return Status Tracking Removals * Removal Orders * Removal Items * Removal Status * Tracking Information Reimbursements & Recovery * Inventory Adjustments * Lost Inventory * Damaged Inventory * Reimbursement Tracking * Recovery Opportunities Shipments * Inbound Shipments * Shipment Status * Shipment Reconciliation Advertising * Sponsored Products * Sponsored Brands * Campaign Performance ⸻ Specific Experience Required You MUST have experience with: * Amazon Selling Partner API * Reports API * Notifications API * Feeds API * Catalog API * Inventory API * Orders API * Finances API * FBA APIs * Amazon Ads API Bonus if you have worked on: * Helium 10 style software * InventoryLab style software * Sellerboard style software * Amazon repricers * Multi-tenant SaaS platforms