Retail Order Pipeline, Event-Driven

High-throughput, asynchronous order ingestion and fulfillment engine built on Amazon EventBridge, SQS FIFO queues, and AWS Lambda, designed to withstand massive e-commerce flash sales without bottlenecks.

Client Industry E-Commerce / Retail

Duration 6 Weeks

Role Serverless Architect

Primary Stack EventBridge · Lambda · DynamoDB

18k/sec

Peak order ingest capacity

40%

Infra cost savings vs always-on

99.999%

Order delivery guarantee

220 ms

P99 checkout confirmation

Clothing rails inside a retail store served by the event-driven order pipeline

Event-Driven Processing Blueprint

API Gateway Direct SQS Buffer

→

SQS FIFO Queue Deduplication & Ordering

→

EventBridge Bus Routing & Filtering

→

Lambda + DynamoDB Inventory & Payments

The Challenge

During previous holiday flash sales, the customer's monolithic inventory database locked up under concurrent checkout requests, dropping thousands of orders and causing overselling disasters.

The Architectural Solution

Step 1

Decoupled SQS Direct Integration

Connected AWS API Gateway directly to Amazon SQS without Lambda compute in the critical ingestion path, providing infinite instant elasticity with zero cold-start delay.

Step 2

Idempotent Event Routing

Configured EventBridge rules with schema registry validation and dead-letter queues (DLQs) to prevent duplicate charges and isolate failing microservices.

Step 3

Single-Table DynamoDB Design

Designed a high-performance DynamoDB single-table schema with atomic counters for inventory reservation, achieving consistent sub-5ms read and write latencies.