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Jarred Sumner

Founder

Founder at Bun

San Francisco, California, United States

FoundedBun · YC

Thiel Fellow 2014

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About

Jarred Sumner is the founder of Bun, a JavaScript and TypeScript toolkit that provides a runtime, bundler, package manager, and test runner compatible with Node.js projects.

Founder at BunYC S19

Intro paths

YC

Jarred went through Y Combinator (Summer 2019) — any YC alum in your network can reach them through the YC community.

GP

Their group partner at YC was Jared Friedman, YC Group Partner — the partner who ran Bun's batch and knows the company first-hand. YC profile ↗

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In turn, Jarred can intro founders to Bun's investors below.

Bun's investors · 4

Andreessen HorowitzMenlo Park · $500K – $50M checksKhosla VenturesMenlo Park · $100K – $20M checksKleiner PerkinsMenlo Park · $500K – $15M checks · since 2023Y CombinatorSan Francisco · $500K checks · since 2019

Experience

  1. AnthropicMember of Technical Staff (Manager)current2025 — presentSan Francisco, California, United States
  2. BunFounder & CEO2021 — 2025San Francisco, California, United States
  3. StripeFront End Engineer2018 — 2019
  4. Side ProjectsOwner2018
  5. StripeFront End Engineer2017 — 2018
  6. Freelance & Side ProjectsOwner2016 — 2017
  7. IntercomProduct Engineer2015 — 2016San Francisco Bay Area
  8. TeespringFull Stack Engineer, Intern2014san francisco, california
  9. LockitronSoftware Developer2012 — 2014mountain view, california

Skills & more

JavaScript9Mobile Applications6Ruby on Rails5Objective-C5Entrepreneurship5iOS4CSS3Front-end3Ruby2Cartography2

From Jarred's professional profile.

Frequently asked questions

Who is Jarred Sumner?
Jarred Sumner is the founder of Bun, a JavaScript and TypeScript toolkit that provides a runtime, bundler, package manager, and test runner compatible with Node.js projects.
Where does Jarred Sumner work?
Jarred Sumner is Founder of Bun.
What companies did Jarred Sumner found?
Jarred Sumner founded Bun.

Founder mafias

Shared employers