Real-time Coupon Auction Backend

Problem

Live auctions require low-latency bid updates across many users while handling scheduled traffic spikes without overloading the request path.

Solution

Implemented websocket broadcasting for real-time updates, backed by queue/stream processing using Kafka + Redis. Used Redis RQ + Faust to run background workflows and automation without blocking core API flows.

Impact

• Maintained responsive live bidding by moving heavy work off the synchronous request path.
• Improved throughput and stability during scheduled auction spikes through event-driven processing.

Highlights

• Websocket broadcasting for bid updates and state changes.
• Queue-based automation via Redis RQ and event handling via Faust.
• Kafka used for event flow / queueing where needed to stabilize load.