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Coupon Engine

High-Concurrency Promotion Platform

A distributed coupon and promotion engine built for Cleartrip handling peak traffic during flash sales. Uses event-sourced architecture with Redis for atomic operations.

Key Metrics

22% booking growth

Millions of concurrent users

Sub-10ms validation

Zero race conditions

Architecture

Validation Service

Redis Atomic Ops

Kafka Events

Analytics Engine

Flow

Booking Request → Coupon Validation → Redis Lock → Apply Discount → Kafka Event

Tech Stack

JavaSpring BootVert.xRedisKafkaMySQLGCP