San Francisco-based data infrastructure startup S2.dev has raised $3.85 million in a funding round led by Accel, with participation from Uncorrelated Ventures and other investors.
With this round, the company’s total funding stands at $5.5 million.
The fresh capital will be used to accelerate product development, expand its managed cloud service into additional global regions, and support early enterprise customers adopting its platform.
S2.dev was co-founded in 2024 by Shikhar Bhushan, Stephen Balogh, and Dwarak Govind Parthiban. The startup builds a serverless datastore for real-time and streaming data, designed for use cases such as collaborative software, AI agents, and multiplayer applications.
Its platform offers durable, auto-scaling streams accessible via REST APIs, combining persistent storage with low-latency access.
The company’s core product enables developers to manage fast-moving, stateful data without handling underlying infrastructure.
It supports on-demand streams that can be appended to, read from, and controlled programmatically, positioning streams as a fundamental cloud storage primitive. In AI-driven systems, these streams can be used to handle token outputs and message exchanges across multiple agents.
S2.dev was previously backed by Y Combinator and was part of its Fall 2025 batch.