I need a full-featured, Z2U-style marketplace where gamers can safely buy and sell in-game items, currencies, skins, and entire accounts. The site must feel equally smooth on desktop and mobile, so please plan for a fully responsive front-end or a PWA approach from the start. Payments will run exclusively through cryptocurrencies at launch. I’ll rely on an on-chain escrow flow that releases funds only after the buyer confirms delivery, with automatic dispute timers and manual override from the admin panel when needed. Security, 2-FA and basic KYC hooks are a must to keep fraud low. Buyer experience – Robust search with multi-layer filters (game, server, price range, delivery time, seller rating, etc.). – Wishlist that triggers email / in-app notifications when desired items appear or drop in price. – Real-time chat so buyers can confirm details with sellers before committing. Seller experience – Quick listing wizard for accounts, items or currency bundles with bulk upload support. – Live inventory dashboard to adjust stock, pricing, delivery ETA and promos. – Order tracker that syncs with the escrow logic and automatically requests buyer confirmation. – Rating dashboard to monitor feedback and resolve issues. Admin panel – User, listing and transaction management. – Fee configuration (flat or percentage) and manual fund release controls. – Dispute center with evidence upload and decision logging. – Analytics on GMV, conversion, churn and top games. Core acceptance criteria 1. Desktop and mobile views share a single codebase and pass Lighthouse mobile audits above 80. 2. Crypto payment flow (BTC, ETH and one ERC-20 token to start) clears testnet end-to-end with mocked wallets before going live. 3. Escrow smart contract or server-side wallet service keeps seller funds locked until buyer marks order “received” or dispute timer expires. 4. Full buyer journey—search → chat → checkout → confirmation—runs in under 5 clicks. 5. Admin can resolve a dispute and release funds from a dedicated screen. Tech stack is flexible; I lean toward React + Node.js (or Next.js) paired with a PostgreSQL database, but I’m open to Laravel, Django or similar if you can prove faster delivery. Code must be clean, documented and ready for future third-party integrations like PayPal once we decide to broaden payment options. Let me know how you would tackle architecture, timeline, and any past work that shows you can deliver a secure, high-volume marketplace.