Instant just shipped version 1.0 of its backend platform, built for apps that AI coding agents create. The entire thing is open source.
The pitch is straightforward. When an AI agent builds an app, it shouldn't hit a wall trying to wire up databases, auth, and real-time sync. Instant handles that. You get unlimited apps with no freezing, because new projects are just database rows, not spun-up VMs. According to the company's architecture essay, creating a backend takes a few hundred milliseconds and costs kilobytes of RAM when idle. That matters when agents are churning out dozens of prototype apps.
The technical stack is unusual. Clojure powers the sync engine, sitting on multi-tenant Postgres. On the client side, the SDK uses IndexedDB and a Datalog-based triple store to manage local state. Apps get offline support, real-time multiplayer sync, and optimistic updates without custom infrastructure. Linear, Notion, and Figma all built proprietary sync engines to get these features. Instant wants to make that available to any app, including ones written by agents.
Beyond data sync, Instant bakes in services most apps need. Auth covers magic codes, OAuth, and guest access. File storage, presence detection, and token streaming come built in. Files are just database rows, so deleting a todo linked to a file cascades properly. No background workers. No multiple sources of truth. Each service "is built to work together as a single, integrated system," the founders write. That integration is the real selling point. Stringing together separate services gets messy fast, especially when an AI agent is managing the glue code.
The founders, Joe Averbukh, Ilya Lakhin, and Aljaz Kovac, previously ran engineering and product at Mobilize, a SaaS platform for political campaigns. Averbukh also spent time at Y Combinator and Yext. Lakhin's Clojure expertise shaped the sync engine's architecture. The company was part of YC's Winter 2024 batch. Four years of work went into this release. They're betting AI-coded apps need fundamentally different backend infrastructure than what traditional platforms offer.