| Service | Remarks |
|---|---|
| Amazon DynamoDB | It stores all of the data for books, orders, and the checkout cart. |
| Amazon OpenSearch | It powers search functionality for books. |
| Amazon Neptune | It stores information on a user's social graph and book purchases to power recommendations. |
| Amazon ElasticCache for Redis | It powers the books leaderboard. |
| AWS Lambda | It updates derived data in different services like Amazon Elasticsearch, Amazon Neptune etc. |