restate

Restate is a runtime for building backends and AI agents that recover from failures without the engineering overhead usually required to get there. It uses durable execution, recording completed work and state so an application can resume from the right point after a crash or interruption, and extends that property to the communication and state shared across a distributed system. The company was founded by members of the team that created Apache Flink, the open-source framework that helped make real-time stream processing a core part of modern data infrastructure. The co-founders are Stephan Ewen, Till Rohrmann, and Igal Shilman , working across Berlin and San Francisco. This launch marks a $20M Series A led by Singular with participation from Redpoint Ventures and Capital One Ventures , raised to push durable execution from a niche workflow tool into a default building block for backends. At the center of Restate's architecture is a purpose-built distributed log paired with an event-driven orchestrator. Rather than placing durable execution on top of a general-purpose database, the log becomes the foundation for execution, state and communication. Restate says this creates a self-contained system that does not require an external database or search service while remaining lightweight enough to use across an application. Developers get primitives like Durable Functions, Virtual Objects, Virtual Queues, and durable RPC that cover async work, queued jobs, and multi-service calls. The timing points squarely at agents. As LLM-driven systems take on longer tasks that span tool calls, external APIs, and human handoffs, the cost of a lost step grows, and retries alone stop being enough. Restate's longer-term aim is to build the runtime underneath agents, workflows, and distributed applications that makes durability, state, communication, and coordination feel like normal programming primitives , which is the thesis this round is funding.