Engineering Insights

Node.js 25.8.0 (Current)

PRX Part 3 — Training a Text-to-Image Model in 24h!

The Hidden Price Tag: Uncovering Hidden Costs in Cloud Architectures with the AWS Well-Architected Framework

In this post, we discuss how following the AWS Cloud Adoption Framework (AWS CAF) and AWS Well-Architected Framework can help reduce these risks through proper implementation of AWS guidance and best practices while taking into consideration the practical challenges organizations face in implementing these best practices, including resource constraints, evaluating trade-offs and competing business priorities.

Now Shipping: Accessible UX Research, A New Smashing Book By Michele Williams

Our newest Smashing Book, “Accessible UX Research” by Michele Williams, is finally shipping worldwide — and we couldn’t be happier! This book is about research, but you’ll also learn about assistive technology, different types of disability, and how to build accessibility into the entire design process. This thoughtful book will get you thinking about ways to make your UX research more inclusive and thorough, no matter your budget or timeline. Jump to the book details or order your copy now.

Hello Developer: March 2026

In this edition: Join Apple at GDC. Get tips on privacy and security in a new developer activity. Dive deep on coding intelligence in Xcode 26. Learn how the Speechify team is going all in on AI. Catch up on the latest news and updates. Read now

Building Slack agents can be easy

Slack is already where teams work. It provides a natural interface for agents, with messages, threads, buttons, and events, so you don't need to invent a new UI or onboarding flow. Getting from "I want a Slack agent" to a running deployment, though, means coordinating across a lot of systems: Each piece has its own docs, and they all need to work together. Coding agents like Claude Code, OpenCode, Cursor, and GitHub Copilot are well suited for exactly this kind of coordination because they can r

Scaling redirects to infinity on Vercel

Redirects are trivial at a small scale, but at millions, latency and cost become real systems problems. Previously on Vercel, redirects were handled by routing rules and middleware. Routing rules support up to 2,000 complex redirects with wildcards, and they function as an ordered list evaluated in sequence. Each rule may involve regex matching, meaning a single request could trigger many expensive evaluations. This is acceptable for a few thousand routing rules, but as counts grow, per-request

Vercel Sandbox now accepts environment variables at creation

The Vercel Sandbox and now support setting environment variables at sandbox creation that are automatically available to every command.SDKCLI When running multi-step processes in a like installing dependencies, building a project or starting a dev server, each step often needs the same environment variables. Now, these are available with every call.Vercel SandboxrunCommand Environment variables passed to are inherited by all commands automatically. Per-command env in can still override ind