Restate raises $20M Series A to make AI agent infrastructure durable

Restate (Berlin) has raised $20 million in a Series A (approximately €18.5 million), led by Singular, the European venture firm, with Redpoint Ventures and Capital One Ventures participating. The round brings total funding to $27 million and will fund product development and a US commercial expansion from San Francisco.

The company builds what it calls durable execution infrastructure — a middleware layer that makes AI agents, workflows, services, and state machines reliably resilient across crashes, restarts, and partial failures. The core claim: rather than requiring each application team to engineer fault-tolerance into their own code, Restate embeds that guarantee into the infrastructure itself.

Why reliability is the next AI infrastructure problem

As AI systems move from single-agent experiments to multi-agent production deployments, the failure modes multiply. A single agent that crashes is an annoyance; a coordinated workflow of five agents where one silently fails mid-run, corrupts shared state, and triggers a cascade is a production incident. Existing durable execution solutions address individual processes; Restate targets the interaction layer — across services, agents, and persistent state — as a unified reliability guarantee.

The founding team's backgrounds matter here. Stephan Ewen, CEO, is co-creator of Apache Flink, the stream processing framework deployed in over 200 million instances globally. Till Rohrmann also has a Flink background; Ahmed Forghal held engineering leadership roles at Stripe and Meta. Igal Shilman rounds out the technical founding group. The team left enterprise AI infrastructure positions to solve a problem they diagnosed from the inside.

Capital One as a signal

The presence of Capital One Ventures as a corporate investor is worth noting. Financial services infrastructure running AI agents has among the strictest reliability requirements in any industry — a compliance agent that drops a step mid-execution is not a debugging problem, it is a regulatory event. Capital One's participation suggests the infrastructure is credible for that tier of deployment, which is also the tier that pays infrastructure-level pricing.

Restate will use the Series A to deepen the product, grow the San Francisco commercial operation, and build US enterprise relationships. The EU base stays in Berlin.