Introducing Lambda MicroVMs - Isolated, Stateful Sandboxes for Running Untrusted Code on AWS

👋 Hey there, Tech Enthusiasts! I'm Sarvar, a Cloud Architect who loves turning complex tech problems into simple solutions. I've worked with AWS, Azure, DevOps, Data, Analytics, Generative-AI and Agentic-AI building real systems for real companies. In this article series, I'll share what I've learned in a way that's easy to follow, whether you're experienced or just getting started. Let's get into it! 🚀 On June 22, 2026, AWS launched Lambda MicroVMs. It is a new compute primitive inside Lambda that gives you a dedicated Firecracker virtual machine per user or session. It is not an update to Lambda functions. It is a different thing with a different model, different pricing, and different use cases. If you are building anything where users or AI agents execute arbitrary code and you need strong isolation, fast startup, and persistent state this is what you reach for now. What Existed Before and Why It Was Not Enough Before this launch, if you needed to sandbo