Restate raises $20M Series A for durable infra behind AI agents

Restate, founded by the creators of Apache Flink, said Wednesday it raised a $20 million Series A led by Singular, with Redpoint Ventures and Capital One Ventures joining, bringing total funding to $27 million for durable execution infrastructure used from backends to AI agents.

AI agents make long-running, multi-step work ordinary, and every crash or dropped API call can strand half-finished tool use. Restate’s Series A is a bet that durability belongs in the runtime itself, not as a bolted-on workflow tool that teams only use for a few expensive paths.

On Wednesday, 30 September 2026, Restate said it raised a $20 million Series A. Singular led the round. Redpoint Ventures and Capital One Ventures took part. A Series A is an early venture round, once a company has a product and some customers, and before the much larger later rounds. The $20 million is the new money. Business Wire, as Financial Content carries it, says the round brings total funding to $27 million. That $27 million is this round plus what Restate had already raised. It is not a valuation, the price a buyer would put on the whole company. The wire says the money will support continued product development and expansion in the United States, including a new commercial hub in San Francisco. Financial Content stamps the item September 30, 2026, at 10:00 a.m. Eastern. Restate’s own blog posts the raise the same day, under Stephan Ewen’s byline, and does not print an hour or the $27 million total. Those funding lines are Restate’s.

Restate calls itself a durable execution company. Durable execution means the software remembers the steps it has already finished. After a crash, a dropped network call, or an API that is briefly down, it can continue, instead of making a developer write that recovery into every step. An API is the address one program uses to ask another program for work. Restate says it is building that infrastructure for modern applications, from distributed backends to AI agents. A distributed backend is the set of services behind an app, often running on more than one machine. An agent, here, is software that takes a series of steps, calls models and tools, and sometimes waits for a person. The wire says Restate is already used by hundreds of companies. The blog says the company started more than three years ago, because ordinary backend work kept turning into a homemade workflow engine. Those lines are Restate’s.

The wire names the production uses. It says Restate handles durable execution for the latest Replit Agent, and enterprise workflows at companies including DOSS, BILT rewards, and the Fortune 500. Fortune 500, here, means one of the largest companies in that U.S. ranking. The company blog is more specific on three of them. It says Replit moved execution of the Replit Agent onto Restate as the agent’s architecture changed, and that the new architecture uses more than 10 times as many durable actions as the generation before it. A durable action is one step the runtime records so it can be replayed after a failure. Ten times as many means the new agent records at least ten steps for every one the old design recorded, on Restate’s account. The blog says DOSS runs high volumes of enterprise workflows, and smaller workflows inside them, on Restate. It says DOSS replaced a BullMQ setup. BullMQ is a queue that hands jobs to background workers. Restate says that change improved how fast a run finishes, how failures are handled, and how a person can see and debug what happened. The blog says a Fortune 500 bank adopted Restate for financial workflows that have to stay consistent across more than one region. The wire’s phrase is “the Fortune 500.” The blog’s phrase is “a Fortune 500 bank.” Both are Restate’s. Neither post names the bank.

Michele Catasta, president and head of AI at Replit, said the team needed a new durable execution runtime that was fast and a pleasure for developers to work with as the agent architecture kept changing. He said Restate fit that, and that it now handles all durable orchestration at Replit. Orchestration, here, means lining the steps up so they happen in order and can resume. He said that gives Replit room to expand what the agent platform can do. That quotation is his, in the Business Wire release. The blog describes the Replit move and the 10-times line. It does not print Catasta’s quotation.

Stephan Ewen, chief executive and co-founder, said durable execution solved an important problem by making individual processes reliable. He said software is increasingly made of services, agents, workflows, and state that all have to stay reliable as they interact. He said Restate believes durability has to become a property of the infrastructure itself. That quotation is his, in the wire. Henri Tilloy, a partner at Singular, said Restate is redefining where durable execution can be applied. He said that instead of treating durability as something confined to individual workflows, Restate brings execution, state, and communication together in a runtime developers can use across an application. He said the founders built Apache Flink into foundational infrastructure for real-time systems, and that Singular believes they can do the same for durable infrastructure. That quotation is his, in the wire.

The wire says Restate recently launched Bring Your Own Cloud, shortened to BYOC. A company can run managed Restate inside its own cloud account and its own virtual private cloud, the private network inside that account, while the application data stays in the company’s infrastructure. The blog describes the same idea from the design side. It says many durable-execution systems are several pieces plus a database, and are heavy to run. That weight is a problem when the work is a loan, a medical bill, or another financial or healthcare flow, because the data has to stay inside a network boundary. The blog says Restate ships as one program that can form a cluster, without a separate database the operator has to run, and that this design opens self-hosting and BYOC. Those lines are Restate’s. Neither post prints a price for BYOC.

The founders previously created Apache Flink. Flink is open-source software that processes a stream of events as the events arrive, instead of waiting for a file to finish. The wire’s about box calls the founders the original creators of Flink, and says Flink runs at companies including Apple, Netflix, Uber, LinkedIn, Stripe, Alibaba, ByteDance, Tencent, and OpenAI. Those are Flink deployments, as Restate states them. They are not a list of Restate customers. The about box says Restate is used by hundreds of companies and is backed by Singular and Redpoint Ventures, with teams in Berlin and San Francisco. The round itself also includes Capital One Ventures. The about box’s “backed by” sentence names Singular and Redpoint. Both wordings are on the wire. The media contact is Erin Lumley at The PR Network, erin.lumley@thepr.network.

The blog’s argument is that durable execution is still too often a tool a team brings in for a few expensive workflows. Ewen writes that a modern backend is also services talking to services, shared state, sessions, and queues, and that those need durability too. One feature he points to is a Virtual Object. That is a piece of state keyed by an ID, such as one chat session, with the state saved as the session goes, and only one write running at a time for that key. On cost, the blog says managed durable execution is commonly priced in the tens of dollars per million durable actions, often $25 to $50, while a database or a queue commonly costs about $1 per million writes or events. On speed, it says getting a durable action from more than 25 milliseconds to under 5 milliseconds makes it easier to record an extra step. A millisecond is a thousandth of a second. Twenty-five milliseconds is a short pause a person can still feel in a tight loop. Under five is a smaller slice of that pause. Those figures are Restate’s comparison of typical prices and speeds in the category. The blog does not print Restate’s own price. It does not say an outside lab measured the 5-millisecond line.

TechCrunch’s Marina Temkin reported the same round the same morning. The page byline reads 7:27 a.m. Pacific on 30 September 2026. Her account matches the $20 million, Singular as lead, and Redpoint Ventures and Capital One Ventures taking part. She writes that Ewen co-founded Restate in 2022 to provide durable workflow infrastructure, and that he told TechCrunch the product was not built for agents at the start and turned out to fit the problems agents raise. She reports that, over the last few months, Restate has closed multiple customer contracts in the six figures and the seven figures, according to Ewen. Six figures means at least $100,000. Seven figures means at least $1 million. Those contract sizes are Ewen’s, as Temkin reports them. They are not in the blog or the wire. She writes that the new capital will help Restate take on Temporal, the larger company in this category, which she says announced a $550 million Series E at a $12.55 billion valuation earlier this month. That competitive frame, and Temporal’s round, are Temkin’s. Restate’s blog and the wire do not say Restate replaces Temporal, and they do not print a valuation for Restate. She adds that Ewen was a co-creator of Apache Flink and later chief technology officer of Data Artisans. Alibaba acquired that company in 2019 and renamed it Ververica. She says he co-founded Restate with former colleagues Igal Shilman and Till Rohrmann, and that Ahmed Farghal, previously an engineer at Stripe and Meta, joined as the fourth co-founder at the Series A. She says the company will use the money to hire people who sell and more engineers, and to expand its office in the San Francisco Bay Area. The wire’s phrase for the city plan is a new commercial hub in San Francisco. The biography, the contract sizes, and the hiring plan are TechCrunch’s.

The picture is Restate’s Series A graphic. On a dark navy field, the Restate wordmark sits above a large $20M, with SERIES A underneath. A line reads “Led by Singular.” Under that, “with participation from” sits beside the Redpoint mark and the Capital One Ventures mark. It is the company’s announcement graphic for this round. It is not a photograph of an office, and it does not print a date.

In plain terms, Restate said on Wednesday that it raised $20 million, led by Singular, so the ability to resume after a crash can sit in the runtime behind ordinary backend work and AI agents, rather than only in a few costly workflows. The wire puts total funding at $27 million and names Replit Agent, DOSS, BILT rewards, and Fortune 500 use. The 10-times line on Replit, the DOSS queue replacement, and the $25-to-$50 comparison are Restate’s. TechCrunch’s comparison with Temporal is Temkin’s. Restate does not print a valuation.