Restate

Restate is a durable execution engine: you write ordinary service handlers in TypeScript, Java, Kotlin, Go, Python, or Rust, and Restate journals every step so invocations survive crashes, restarts, and deploys — retries skip already-completed steps and even sleeps are durable.

It runs as a single self-contained binary with no external database or broker required, and includes virtual objects (durable entities), workflows, and service discovery via an admin UI. Built by the team behind Apache Flink (ex-Ververica founders).

1. Install the server and CLI (macOS/Linux): brew install restatedev/tap/restate-server restatedev/tap/restate — or grab binaries, the npm package, or the Docker image. To disable anonymous telemetry, set DO_NOT_TRACK=1.
2. Start the server: restate-server — the UI is at http://localhost:9070.
3. Scaffold an example service (Node.js ≥ 22): restate example typescript-hello-world && cd typescript-hello-world && npm install, then run it with npm run dev (serves on port 9080).
4. Register the service with Restate: restate deployments register http://localhost:9080 (use http://host.docker.internal:9080 if Restate runs in Docker).
5. Invoke it: curl localhost:8080/restate/call/Greeter/greet --json '{"name": "Sarah"}' → You said hi to Sarah!. Kill/restart the service mid-run to watch durable recovery skip completed steps.