We Replaced Jest With node:test in 12 Services — Here's What Broke and What Didn't
After months of using Jest for unit testing, we decided to take the plunge and migrate to the built-in node:test runner. The results were surprising, …
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Building a Production Serverless URL Shortener on AWS — 21 Articles, Every Test Run for Real
Most serverless tutorials stop at a hello-world Lambda behind API Gateway. I wanted the opposite: build one real product end to end, run every command…
S3 Files Killed My Least Favorite Lambda Pattern
Every Lambda function I have written that touches S3 has the same three lines of plumbing: s3 . download_file ( bucket , key , " /tmp/input.csv " ) pr…
Automatically Healing CloudFormation Drift with Durable Functions
This article is a machine translation of the contents of the following URL, which I wrote in Japanese: Durable Functions を用いて CloudFormation のドリフトを自動修…
Bun on Lambda Is Faster Than Node.js 22 — But Is It Production Ready?
After running Bun on Lambda for 60 days, we discovered it's 3x faster than Node.js 22. However, the transition wasn't without its surprises. Here's wh…
Build your own daily notification bot on AWS Free Tier
A Lambda function checks the forecast, Bedrock tells you what to wear, and ntfy.sh pushes it to your phone before you get ready for the day, and it's …
Self-Hosted Vessel Email Alerts with AWS Lambda and SES
The thing you actually want is an email. Not a dashboard you have to remember to open. Not a webhook you have to write a server for. An email — the ki…