How to Rotate Claude API Keys with Secrets Manager and Lambda Without Getting Locked Out
Developers rush to rotate API keys for security, only to discover their AI‑powered apps suddenly start throwing 401 errors. The hidden culprit? A st…
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Moving Lambda Logs to a Centralized Location [S3]
Moving Lambda Logs to a Centralized Location[S3] AWS Lambda gives you logs out of the box, but once an application starts growing, the real question…
AWS Lambda Web Functions: your HTTP server on Lambda, with real concurrency and active-CPU billing
On October 12, AWS launched Lambda Web Functions , and it's the biggest change to Lambda's programming model in years. Instead of writing a handler…
Beyond Stateless Lambda: Harnessing MicroVMs for Isolated AI Sandboxes
Here is the updated, complete blog post incorporating the AWS Console location and Terraform code specification as dedicated sections. Unlocking Nex…
What to do in such situations: Developing an app integrated with generative AI
Hello, I’m pj-corridor, an engineer. In this article, I will introduce the challenges I faced while developing an application integrated with genera…
Stop hardcoding AWS Lambda layer ARNs: use public parameters for the AWS Parameters and Secrets Lambda Extension
To add the AWS Parameters and Secrets Lambda Extension to an AWS Lambda function, you can open the documentation, find the ARN table, locate your AW…
Claude Function Calling with API Gateway: Build a Secure Serverless LLM Endpoint
When Claude wants to run code, you need a webhook it can call. Most teams slam together a Lambda URL, but that skips critical security and versionin…
AWS Serverless Patterns and Anti-Patterns: What Works, What Breaks, and When to Use What
Serverless on AWS isn't "just use Lambda." It's a design philosophy: let AWS manage the infrastructure, pay only for what you use, and build with ma…
Where exactly is the card in this photo? Image segmentation model inside a maxed-out lambda container
A crooked phone photo goes in, a clean straight card image comes out - no GPU, and nothing running when nobody uploads. It runs on the biggest lambd…
Is this even a valid card? Zero-shot image classification model in a lambda container
No training, no training data and no GPU. This classifier's whole brain is a list of English sentences I typed by hand - and I can teach it a new ca…
How AI Agents Work: The Plan-Act-Observe Loop, Explained Step by Step
Imagine having a personal coding assistant that not only writes code for you but also debugs and optimizes it. This is now a reality with AI agents.…
The reconnect storm that never touched the broker
There's a particular kind of 2 a.m. that only happens in fleet IoT. A slice of your devices — a few thousand of them — drop off the network at once.…
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…
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 comma…
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 " )…
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…
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…
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'…
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…