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…
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EventBridge Pipes for AI Agents: Building a Self‑Contained Plan‑Act‑Observe Loop in Node.js
Imagine an AI agent that can plan, act, and observe without a single Lambda function acting as glue. EventBridge Pipes let you stitch together LLM c…
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…
We Cut Lambda Cold Starts 56% — Three Wrong Turns Before the Real SnapStart Fix
CloudWise's /dashboard took up to 2.3 seconds to load cold. That's the API Lambda's own cliff — not network, not the frontend. AWS Lambda SnapStart…
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 AWS runtime-upgrade error map: which errors you'll hit, in what order, for each migration path"
Every deprecated-runtime migration produces the same shape of pain: you bump one version number, redeploy, and get hit with errors that look unrelat…
Cloud Native Buildpack for AWS Lambda PHP (Bref) - technical detail
In first post of this series, I introduced my Cloud Native Buildpack for AWS Lambda PHP (Bref). Here I want to provide some technical details on how…
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.…
My Terraform Drift Alert Could Not Explain the Drift
My Terraform drift detector had a problem. It could run terraform plan , detect drift, and send me an email through SNS. But the message only told m…
The AWS Lambda Node.js 20 deadline everyone gets wrong (it's not September 2026)
If you searched "nodejs20.x Lambda deadline" recently, you probably read that AWS blocks new function creation on Aug 31, 2026 and updates on Sep 30…
Integrating Lambda Durable Functions into a Step Functions Workflow
At re:Invent 2025, AWS announced Lambda Durable Functions . The feature introduces a checkpoint/replay mechanism that allows Lambda executions to ru…
"Error: Cannot find module 'aws-sdk'" on Lambda — migrating to @aws-sdk v3
If you upgraded a Lambda function from nodejs16.x to nodejs18.x (or nodejs20.x / nodejs22.x ) and your logs now show: Runtime.ImportModuleError: Err…
Building a worker-evaluator retry loop in LangGraph (and where it bites you on Lambda)
Most agent demos stop at "the model called a tool and gave an answer." That answer is often wrong, and nothing in the loop notices. I wanted an agen…
Serverless image pipeline with aws lambda+node+wasm: from 11.5mb to 91.2kb
A while back I needed to process thousands of images for an e-commerce platform: multiple versions per product, carousel, thumbnail, invoice miniatu…
I Built a Serverless VPN on Lambda MicroVMs — 12 Builds, 5 Dead Ends, 1 Working Architecture
TL;DR I built a personal VPN using AWS Lambda MicroVMs. Your traffic exits from AWS. When you disconnect, the MicroVM terminates — zero cost, nothin…
We Deleted 300 Lines of Code After Discovering Node.js 22's Hidden Perf Feature
Node.js 22's built-in diagnostics channel is being criminally underused. This week, our team stumbled upon an obscure option that replaced 300 lines…
Migrating AWS Lambda from Node.js 20 to 22 — every breaking change
AWS deprecates Lambda runtimes on a 3-phase schedule: Phase 1 ends security patches, Phase 2 blocks creating new functions, Phase 3 blocks updating…
IAM Access Analyzer Lied to Us: The $1,000/Month Overprovisioning Mistake
A month ago, we thought we'd solved our access control issues with IAM Access Analyzer. But a closer look revealed a staggering overprovisioning pro…
Kinesis Data Firehose Is Not a Silver Bullet: How Undocumented Partition Key Limits Broke Our Real-Time Analytics Pipeline
Our real-time data pipeline was failing due to mysterious throughput limits. The culprit? A little-known Kinesis Data Firehose limitation that has n…
3- AWS Serverless: REST API vs. HTTP API
There is common point of confusion. what's the different between REST API vs. HTTP API in AWS and what's the different between them and a traditiona…
1- AWS Serverless: Designing a serverless API: Order Processing API (E-commerce)
Modern enterprise order processing architectures must decouple synchronous client demands from asynchronous backend dependencies. Here I'll detail a…
Triggering Lambda Durable Functions from SQS
Lambda durable functions, introduced in re:Invent 2025, are a great fit for long-running workflows that need to wait for external events, callbacks,…
AWS Lambda Managed Instances with Java 25 and AWS SAM – Part 7 Implement scheduled scaling
Implement scheduled scaling Recently, Amazon EventBridge Scheduler added 619 new SDK API actions . One of these actions adjusts the Lambda function'…
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 " )…
Lambda Execution Roles Are Quietly Breaking Your Least Privilege Policy
Who This Is For If you are using AWS Lambda to build serverless applications and you have never stopped to look closely at the IAM roles attached to…
Building a Low-Cost Image Converter on AWS With Rust Lambda
Project demo link : https://image-ignite.vercel.app/ This started as a hobby project. I was thinking about a simple image conversion service for res…