A tinkerer who turned reliability into a business
Tony Holdstock-Brown has spent most of his life pulling things apart to understand how they work. His public GitHub bio still reduces his whole career to five words: "tinkerer since 10." It is a small line, but it explains a lot about how he ended up running Inngest, a San Francisco company built on a single stubborn observation about software engineering.
That observation goes like this. Engineers, he argues, spend half their time writing the code that pushes a product forward, and the other half just keeping that code from falling over. Retries, queues, background jobs, timeouts, the slow accumulation of glue that holds a real system together. It is unglamorous work, and for years it was treated as simply the cost of doing business. Holdstock-Brown decided it did not have to be.
Before Inngest, he worked as a senior engineer at Docker between roughly 2015 and 2017, during the years when containers were reshaping how software got shipped. He later became Head of Engineering at Uniform Teeth, where he ran a team and felt the same friction from the other side of the org chart. The pattern kept repeating: talented engineers losing hours to infrastructure plumbing instead of the product itself.
The company came together through a fairly ordinary moment. Holdstock-Brown met his co-founder, Dan Farrelly, in a shared co-working space in New York City. The two got talking, found they were frustrated by the same things, and decided to build a fix. Inngest was founded in 2021, with Farrelly as CTO and Holdstock-Brown as CEO.
What they built is best described as an execution layer. Inngest lets developers write event-driven workflows directly in their own codebase, then handles the hard parts underneath: durability, retries, rate limiting, concurrency, scheduling, and observability. The idea is that any engineer should be able to run a reliable background job or a multi-step process without becoming an expert in distributed systems, and without configuring and babysitting queues by hand. As one of the company's own lines puts it, developers shouldn't be managing queues themselves in 2024.
The platform follows an open-core model. The core project is open source and has climbed past 5,600 stars on GitHub, with SDKs in TypeScript, JavaScript, Python, and Go, and the option to run everything on a laptop or on Inngest Cloud. That open approach fits Holdstock-Brown's temperament. He is known for building in public through code rather than through a polished professional feed, and is openly reluctant about LinkedIn even while running a fast-growing startup.
Then artificial intelligence arrived and changed the shape of the problem. AI agents are, by nature, long-running, non-deterministic, and prone to failure partway through. They are exactly the kind of workload that needs durable, observable execution. Inngest repositioned around this, describing itself as "the observable execution layer for agents and workflows - from the first function to full production." The bet is that the messy reliability problem Holdstock-Brown started with has become one of the central problems of the AI era.
His thesis for where all of this is heading is compact: iteration is the new product moat. When AI makes it cheap to build almost anything, he argues, the durable advantage is no longer what you build but how fast you can change it. Systems, in his view, should be designed to embrace change rather than merely survive it. That is the pitch he took to investors, and it landed. Inngest raised a $6.1M seed round, then a $21M Series A led by Altimeter Capital, bringing total funding to roughly $31.6M.
The backers read like a who's who of developer tools. Andreessen Horowitz, Kleiner Perkins, Notable Capital, and Afore joined the cap table, alongside angel investors including GitHub co-founder Tom Preston-Werner, Vercel CEO Guillermo Rauch, and dbt Labs founder Tristan Handy. Teams like SoundCloud and Day.ai now run on the platform. For a company built around making failure boring, the traction has been anything but.