S2
s2.dev
Actively hiring
Integration & API Management
Stream Processing & Real-Time Data
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Funding and backers
Team
11-50
employees, estimated range
Backers
1
Y Combinator
Momentum
0/100
no fresh signals
Last sign of life
this month
a posting or a news item
The story so fareach stage dated by its source: the company's releases, the press, registers, filings
Oct 2, 2025
Launched on Hacker News Show HN: Multiplayer AI Chat
Oct 2025
Went through Y Combinator
Apr 4, 2025
On the Hacker News front page Deterministic simulation testing for async Rust · 107 points
Dec 21, 2024
On the Hacker News front page Introducing S2 · 372 points
Nov 2023
Website went live first capture in the Wayback Machine
Tractionpublic signals, read monthly
Backed byfrom the funds' portfolios and accelerator catalogs
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News
Report
Video Conferencing with Durable Streams
Build a video conferencing demo on S2 streams with live media reads, replay, retention controls, and durable frame history.
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Pulse, Gut Clinic, s2.dev, Armatrix get early-stage funding
Medical equipment platform Pulse, healthcare startup Gut Clinic, data infrastructure firm s2.dev, and robotics startup Armatrix have secured early-stage...
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Coordinating adversarial AI agents
Use durable streams to coordinate adversarial AI agents, isolate context, replay reasoning, and scale parallel moderation or forecasting.
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Behind y-s2: serverless multiplayer rooms
How y-s2 uses S2 streams, checkpoints, and leases to make serverless Yjs multiplayer rooms durable and easier to debug.
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Linearizability testing S2 with deterministic simulation
How S2 validates strong consistency with Porcupine linearizability checking and deterministic simulation testing.
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Stream per agent session
Why AI agent sessions need their own durable streams for memory, auditability, isolation, branching, and reliable resume.
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Offices
Where the company hires and what each office is for
Cities
1
Hiring now
0
Countries
1
San Francisco
United States
HQ
10-50 est. staff