This article describes how to build a serverless "endless aisle" retail solution on AWS, enabling customers to order unavailable in-store items for direct shipment.

• Endless aisle allows lean retailers to avoid stocking excess inventory while preventing revenue loss
• Store associates scan SKU codes on tablets/kiosks to check partner availability and process orders
• Architecture uses S3, CloudFront, API Gateway, Lambda, DynamoDB, SQS, and SES
• CloudFront CDN delivers static content; WAF protects against XSS and SQL injection attacks
• Cognito manages user authentication and access control
• Lambda functions handle item lookups, order creation, and partner API transformations
• SQS decouples order processing; DynamoDB stores partner and order data
• DynamoDB Streams trigger notifications via SES to store associates
• EventBridge integrates processed orders with customer ERP systems
• Includes CDK deployment scripts and testing procedures with sample code

This serverless architecture enables retailers to expand product offerings without maintaining additional inventory, improving customer satisfaction and revenue.