Convex raises $57M Series B for its AI-optimised app backend

Convex has closed a $57 million Series B round led by Insight Partners , with Etna Labs , Andreessen Horowitz , and Spark Capital also taking part. The deal brings the developer tooling startup's total outside funding to $110.5 million.

Founded in 2021 by former members of Dropbox 's infrastructure engineering team, it sells an application backend — a set of pre-packaged building blocks companies use to develop custom software. The platform powers nearly 2 million applications, with customers including OpenAI and Zapier .

Convex says its backend is optimised for AI agents, helping developers avoid hallucination-related coding errors. Its database replaces standard SQL queries with TypeScript to reduce type errors, and it pre-packages code for tasks such as real-time data syncing that AI agents otherwise struggle to generate correctly.

The platform bundles a database with a search tool, an authentication mechanism, a file storage system, and a retrieval-augmented generation feature for extending AI agents' knowledge with custom datasets. Convex will use the funding to hire and improve the product.

"Agents reach for the first thing that works, and on most backends the first thing that works is subtly, silently wrong. You'll find out weeks later, in production," said co-founder and chief executive officer Jamie Turner. "Convex is that discipline packaged as a product."

At $57 million, the round lands in the 91st percentile of all-time Series B deals for US enterprise software startups. That places Convex among the better-funded bets on infrastructure built specifically for the AI-agent coding wave.