How I built sandboxes that boot in 28ms using Firecracker snapshots

The author built ForgeVM, a Go-based sandbox orchestrator that uses Firecracker microVM snapshots to boot isolated VMs in 28ms for AI agent code execution. Cold-booting Firecracker takes ~1 second due to kernel and init overhead, but by snapshotting a fully-booted VM's memory, CPU, and device state to disk, restore skips the entire boot sequence. This approach provides hardware-level isolation (KVM) superior to Docker containers, while achieving sub-50ms latency suitable for interactive AI workloads.