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Coasts

DefunctYC F25

Founded 2025 · 2 employees · 2 known investors

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Coasts is a local-first, open source tool that enables parallel development environments by spawning isolated runtimes for AI coding agents working with git worktrees. It integrates with any agentic coding solution and supports hybrid local-remote runtime setups.

Also known as Stanton Street Inc. · JSX Tool

AI & Machine LearningDeveloper ToolsEnterprise SoftwareB2BProductivityDesignWeb Development

Founders & leadership· Y Combinator alumni (F25)

Coasts was founded in 2025 by Jamie Sunderland and Dan Hyman.

JSJamie Sunderland
Jamie SunderlandCEO2025–2026Jamie Sunderland previously founded Cheqout, a QR-based ordering platform that reached 250+ restaurants during the pandemic, and worked as a product engineer at Y Combinator building infrastructure before joining the program again as a founder. Prior to that, he was a developer on Airbnb's risk operations team.
DHDan Hyman
Dan HymanCTO2025–2026Dan Hyman previously worked as a senior engineer focused on cloud and AWS infrastructure, including leading teams on enterprise applications. He also has culinary experience, having worked as a chef at a James Beard award-winning restaurant.

Investors · 2

Blast.Clubreported$5.5M

How we know: Y Combinator's founder network · Not right? Tell us

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Companies working in the same space as Coasts.

Legal entities · 1

corporate structure
Stanton Street Inc.

In the news

JSX Tool: In-Browser React IDEycombinator.com · Nov 2025

Frequently asked questions

What does Coasts do?
Coasts is a local-first, open source tool that enables parallel development environments by spawning isolated runtimes for AI coding agents working with git worktrees. It integrates with any agentic coding solution and supports hybrid local-remote runtime setups.
Who founded Coasts?
Coasts was founded by Jamie Sunderland, Dan Hyman in 2025.
Who are Coasts's investors?
Coasts's investors include Y Combinator, Blast.Club.