---
title: Sunil Pai
description: Indian-British software engineer at Cloudflare; creator of the Cloudflare Agents SDK and PartyKit
category: People
---

# Sunil Pai

![Sunil Pai](https://avatars.githubusercontent.com/u/18808?v=4)

**Sunil Pai** (born 12 November; based in Newcastle upon Tyne / London, England) is an Indian-British software engineer best known for building the **Cloudflare Agents SDK** (`cloudflare/agents`) and for founding **PartyKit**, a real-time multiplayer platform that was acquired by Cloudflare. He is active on X as [@threepointone](https://x.com/threepointone) and has 40,000+ followers.[^x]

## Career

Pai holds a BE in Computer Science from NITK (National Institute of Technology Karnataka). He began his career at companies including J.P. Morgan, Myntra, and Oculus, building front-end infrastructure and developer tooling. He was a long-standing contributor to the **React** core team at Meta/Facebook and is the author of the CSS-in-JS library **glamor** (3.7k stars).[^getprog]

He joined Cloudflare in 2021, where he led development of **Wrangler 2.0** — the CLI for Cloudflare Workers — and contributed extensively to the `workers-sdk` repository. He left Cloudflare around 2022 to found **PartyKit**, an open-source platform for building real-time multiplayer and collaborative applications. Cloudflare subsequently acquired PartyKit and Pai returned to Cloudflare as **Principal Systems Engineer**.[^blog]

Back at Cloudflare, Pai built and maintains the **Agents SDK** (`cloudflare/agents`, 4.7k stars), the primary framework for building and deploying stateful AI agents on Cloudflare's global network. He authored the March 2026 blog post announcing **Dynamic Workers** — AI-generated code executing in secure, lightweight isolates 100× faster than traditional containers.[^dynamic]

He describes himself as "building AI agents @ Cloudflare" and is an active international speaker at JavaScript and React conferences.

## Connection to Jan

Jan identified Sunil as the single highest-priority outreach target in his 2025 Cloudflare strategy, noting Sunil as a "Sequoia-backed founder acquired by Cloudflare in 6 months" and a "direct connection to Cloudflare platform decisions." Jan was connected to Sunil through the chain: Brendan Irvine-Broque → Kate (VC) → Sunil. A meeting was planned for mid-2025 to discuss an IC DevRel/Agents role and Jan's MCP client project.[^collabs][^sunil]

## See Also

- [[Jan Wilmake]]
- [[Parallel AI]]
- [[Kristian Freeman]]
- [[Ricky Robinett]]

[^x]: X profile: https://x.com/threepointone
[^getprog]: Engineer profile: getprog.ai/profile/18808
[^blog]: Cloudflare blog author page: blog.cloudflare.com/author/sunil/
[^dynamic]: "Sandboxing AI agents, 100x faster": blog.cloudflare.com/dynamic-workers/ (March 2026)
[^collabs]: Collaboration priorities: `2025/COLLABS.md`
[^sunil]: Meeting prep notes: `2025/sunil.md`