Build an Online Auction Platform (Like eBay)

Unlike traditional e-commerce, auction platforms require real-time bidding, dynamic price updates, auto-bidding capabilities, and strict auction ending rules. Managing concurrency, handling bid conflicts, and ensuring fair auctions in a scalable system are unique challenges of building an online auction platform.

Create a platform where sellers list products with starting bids and auction durations. Buyers place live bids which update in real time using WebSockets. Users can set max auto-bids, receive outbid notifications, and participate in last-minute bid wars. Admins manage listings, auctions, payments, and disputes.

Sellers list products for auction with starting prices and deadlines. Buyers participate in bidding wars. Bids are processed in real-time, and highest bidders win when timers expire. The system handles payment processing, order confirmations, and shipping status updates automatically.

• Sellers upload product details, images, starting bids, and auction durations.
• Buyers browse ongoing auctions and place live bids manually or set auto-bid maximums.
• WebSocket server updates bids across all connected clients in real time.
• Winning bidders complete payment through secure checkout immediately after auctions close.
• Order status tracking and dispute resolution modules manage post-auction flows.

• How eBay's Bidding System Works (Auction Guide)
• Building a Real-Time Auction System with WebSocket
• Socket.io Real-Time Bidding Example
• Implementing Countdown Timers with React
• Stripe Instant Payment Capture Guide
• Database Design for Auction Systems