Restate

Restate gives you a distributed, durable version of your everyday building blocks. You write ordinary service handlers in TypeScript, Python, Java, Go, or Rust, and Restate guarantees they run to completion: failures trigger retries that recover partial progress via durable execution instead of re-running completed steps, services communicate with exactly-once semantics, and each entity gets isolated key/value state persisted alongside execution progress. Durable promises, timers, and sleeps make long-running agent loops (waiting on a human approval, a webhook, a timer) trivially resilient.

The positioning is explicit in the README: durable AI agents, workflows-as-code, microservice orchestration, and event processing, with SDKs for five languages and a UI/CLI for introspection plus OpenTelemetry traces. It is the simplest on-ramp to the durable-execution idea Temporal pioneered, with a lighter operational story. The license is the catch: BSL 1.1 (Business Source License), not OSI open source, so read it before building a business on the server itself.

1. Install the server: brew install restatedev/tap/restate-server, npx @restatedev/restate-server, or Docker.
2. Install an SDK for your language (npm i @restatedev/sdk, pip install restate_sdk, etc.).
3. Write a service handler with durable steps — ctx.run() for recoverable work, ctx.sleep() for durable timers.
4. Register your service deployment with the server.
5. Invoke it over HTTP/Kafka; inspect executions in the UI and CLI.