Best of AWS DynamoDB — 2025

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   Video

   Kiki's Bytes·37w

   How Uber Saved $6,000,000 in Database Costs

   Uber reduced database costs by $6 million annually by migrating their financial transaction system from DynamoDB to DocStore, their custom MySQL-based distributed database. The migration involved building LedgerStore 2.0 with immutable records, data integrity guarantees, and solving hot partition problems through deterministic sharding. The process included careful data backfilling, shadow writes for real-time sync, and dual read validation to ensure zero downtime during the transition.

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   Article

   Hacker News·32w

   Today is when Amazon brain drain finally caught up with AWS

   A major AWS outage in the US-EAST-1 region on October 20, 2025, caused by DNS resolution issues with DynamoDB endpoints, took 75 minutes to diagnose and affected much of the internet. The incident highlights concerns about AWS's loss of institutional knowledge due to significant employee departures, layoffs (27,000+ since 2022), and high regretted attrition rates (69-81%). Senior engineers who understood deep system failure modes have left, potentially leaving newer teams without the tribal knowledge needed to quickly detect and resolve complex infrastructure issues. The outage suggests that cost-cutting measures and talent drain may be compromising AWS's operational resilience.

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   Article

   InfoWorld·32w

   AWS DNS error hits DynamoDB, causing problems for multiple services and customers

   A DNS resolution error in AWS's US-EAST-1 region caused widespread DynamoDB API failures, affecting multiple AWS services and customers including Perplexity, Canva, Venmo, and others. The incident began shortly after midnight Pacific Time and was resolved within three hours through initial mitigations. The outage highlighted how single points of failure in cloud infrastructure can have global consequences, even when the root cause is isolated to one region.

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   Article

   freeCodeCamp·31w

   How to Build a Full-Stack Serverless CRUD App using AWS and React

   A comprehensive guide to building a serverless coffee shop management system using AWS services. Covers setting up DynamoDB for data storage, creating Lambda functions with reusable layers, exposing APIs through API Gateway, implementing authentication with Cognito, and deploying a React frontend via S3 and CloudFront. Includes detailed steps for configuring IAM roles, handling CORS, creating CRUD operations, and troubleshooting common deployment issues.

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