Marketplace Profit Dashboard Developer

We sell furniture across 10+ European marketplaces and need a custom real-time profit dashboard connected to marketplace APIs. The dashboard must automatically pull orders, deduct commission, VAT, shipping, COGS, ad spend, fixed costs, and return costs, and handle refunds and cancellations retroactively. It should include filters by marketplace, country, SKU, and date range, an admin panel for updating costs without developer help, and mobile-friendly CSV export. You must have direct experience with 2+ relevant marketplace APIs, built e-commerce profit dashboards before, and actively use AI coding tools. Please include which APIs you have worked with, similar projects, and a fixed-price quote with delivery timeline.