Restate – Low-latency durable workflows for JavaScript/Java, in Rust
We'd love to share our work with you: Restate, a system for workflows-as-code (durable execution). With SDKs in JS/Java/Kotlin and a lightweight runtime built in Rust/Tokio. https://github.com/restatedev/ https://restate.dev/ It is free and open, SDKs are MIT-licensed, runtime permissive BSL (basically just the minimal Amazon defense). We worked on that for a bit over a year. A few points I think are worth mentioning: - Restate's runtime is a single binary, self-contained, no dependencies aside from a durable disk. It contains basically a…
In plain words
Restate is an open-source system for building durable workflows using code in JavaScript, Java, or Kotlin, with a lightweight runtime written in Rust. It runs as a single self-contained binary with no external dependencies beyond disk storage, making it suitable for both laptops and servers. The platform implements durable execution for workflows and RPC handlers, allowing developers to write reliable distributed applications that can survive failures and resume from where they left off.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
We'd love to share our work with you: Restate, a system for workflows-as-code (durable execution). With SDKs in JS/Java/Kotlin and a lightweight runtime built in Rust/Tokio. https://github.com/restatedev/ https://restate.dev/ It is free and open, SDKs are MIT-licensed, runtime permissive BSL (basically just the minimal Amazon defense). We worked on that for a bit over a year. A few points I think are worth mentioning: - Restate's runtime is a single binary, self-contained, no dependencies aside from a durable disk. It contains basically a lightweight integrated version of a durable log, workflow state machine, state storage, etc. That makes it very compact and easy to run both on a laptop and a server. - Restate implements durable execution not only for workflows, but the core building block is durable RPC handlers (or event handler). It adds a few concepts on top of durable execution, like virtual objects (turn RPC handlers into virtual actors), durable communication, and durable promises. Here are more details: https://restate.dev/programming-model - Core design goal for APIs was to keep a familiar style. An app developer should look at Restate examples and say "hey, that looks quite familiar". You can let us know if that worked out. - Basically every operation (handler invocation, step, ...) goes through a consensus layer, for a high degree of resilience and consistency. - The lightweight log-centric architecture gives Restate still good latencies: For example around 50ms roundtrip (invoke to result) for a 3-step durable workflow handler (Restate on EBS with fsync for every step). We'd love to hear what you think of it!
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