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Castle

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Intelligent protection against user account fraud and hijacks. Cybersecurity Fraud Detection

About Castle

Castle builds in the cybersecurity category and is tracked by 100Xfounder for operating momentum, talent growth, and market execution.

What they do: Intelligent protection against user account fraud and hijacks. Cybersecurity Fraud Detection

Funding context: Khosla Ventures, $9M Series A in 2019

Recent milestones:

Castle appears in the 100Xfounder startup directory import feed.

Why it Matters

Castle matters because intelligent protection against user account fraud and hijacks. Cybersecurity Fraud Detection

Funding Snapshot

Total Funding: $9.00MLast Round: Series A Khosla Ventures, $9M Series A in 2019All Rounds: 1

Series A | Khosla Ventures, $9M Series A in 2019

Hiring Roles

This company is actively hiring.

Open Roles

Meet the Founders

Castle Team

Castle Team

Founder & CEO

Tech Stack

AWSReactPythonPostgreSQL

Last updated: April 17, 2026

Castle intelligence brief

This profile combines core company context with linked founder, funding, and newsroom routes so readers can evaluate business momentum without switching across multiple tools. Use it as a baseline for comparing peers in the same industry and stage.

For deeper validation, pair this page with founder profile, company news coverage, and stage-based funding hubs to contextualize updates against wider market movement.

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Discover Now

Newsroom and topic pages connected to Castle.

Company News Hub Topic Hubs Funding News

No company-specific newsroom stories available yet.

Contextual Research Links

Jump to country, industry, stage, startup taxonomy, and newsroom routes tied to this company.

Company profile→Company news hub→Founder profile→United States startup directory→United States startup news→Startups in United States→Cybersecurity hub→Cybersecurity startup list→Series A startups→Series A startup list→

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FAQs About Castle

Common questions people ask about this profile.

What is Castle?

Intelligent protection against user account fraud and hijacks. Cybersecurity Fraud Detection

Who founded Castle?

Castle is associated with Castle Team on 100Xfounder.

Where is Castle located?

Castle is listed in San Francisco Bay Area, California, USA.

What stage is Castle in?

Castle is currently mapped to Series A. Funding context: Khosla Ventures, $9M Series A in 2019

What is the latest funding round of Castle?

Castle's latest tracked round is Series A Khosla Ventures, $9M Series A in 2019. Total tracked rounds: 1.

Is Castle hiring now?

Castle hiring status: Open Roles.

What technologies does Castle use?

Castle is associated with AWS, React, Python, and PostgreSQL.

Is Castle verified on 100Xfounder?

Yes. Castle is currently marked verified on 100Xfounder as of April 17, 2026.

How can users connect with Castle founders?

Users can open founder profiles, use listed company links, and track signal updates directly from the 100Xfounder directory.