Blog, page 3

• System DesignOctober 29, 20262 min read

  Idempotent writes in DynamoDB with a guard item

  How to make a DynamoDB write safe to retry: a guard item, a conditional TransactWrite, and why that beats checking first and writing second under load.

• Building in PublicOctober 28, 20263 min read

  How Shipworthy runs Next.js 16 on AWS with SST

  The serverless stack behind this site: Next.js 16 on Lambda and CloudFront via SST and OpenNext, plus the four deploy gotchas that cost me the most time.