Hello Team, I am looking for a senior full-stack developer (or agency) to build a specialized e-commerce platform for selling digital products (Software keys, Game keys, Gift cards). Core Requirement: Aside from the standard storefront for direct customers, the system must act as a Central Inventory Hub that syncs with external marketplaces. Key Features Required: The Storefront: Modern UI/UX for selling keys directly to retail customers. Instant delivery via email/dashboard upon payment. Payment Gateway integration (Stripe, PayPal, Crypto, etc.). Inventory Management (The Brain): Ability to upload bulk keys (CSV/Text). Categorization (Games, Software, Gift Cards). External API Integrations (Crucial): I need the system to connect via API to my seller accounts on G2A, Gamivo, and Eneba. Auto-Listing: When I add keys to my site, I want the option to automatically list them on these platforms. Stock Synchronization: If a key is sold on G2A, it must be instantly marked as "Sold" in my database and removed from Gamivo and my storefront to prevent double-selling. Price Management: Ability to set different prices for the website vs. marketplaces. Technical Preferences: Preferred Stack: [Laravel / Node.js / Python Django] (or suggest your best stack for API performance). Security: High security for database encryption (since we store sensitive keys). Please provide: Estimated timeline and budget. Previous experience with G2A/Eneba APIs (if any). Your suggested technology stack.