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

About Castle

The Problem Castle addresses a core cybersecurity pain point: fragmented operations, slow decision cycles, and poor visibility across teams. Organizations in this market often rely on disconnected tools, which creates delays, revenue leakage, and inconsistent customer outcomes.

The Solution Intelligent protection against user account fraud and hijacks. Cybersecurity Fraud Detection In practice, Castle centralizes critical workflows, automates repetitive coordination, and gives operators a real-time system of record. This reduces manual overhead and improves execution quality at scale.

Why it's growing With the rise of shifting customer expectations, faster digital adoption, and demand for measurable ROI, Castle is positioned to capture sustained demand. Buyers now prioritize speed, reliability, and clear ROI, and the company aligns directly with those purchasing criteria.

Culture The team operates in a fast-paced environment focused on cybersecurity innovation, product velocity, and customer-centric execution. Their culture emphasizes ownership, experimentation, and measurable outcomes.

Why it Matters

Castle matters now because with the rise of shifting customer expectations, faster digital adoption, and demand for measurable ROI, Castle is positioned to capture sustained demand. Buyers now prioritize speed, reliability, and clear ROI, and the company aligns directly with those purchasing criteria.

Funding Snapshot

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

Hiring Roles

This company is actively hiring.

Open Roles

Meet the Founders

Tech Stack

AWSReactPythonPostgreSQL

Last updated: February 23, 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.

Related Companies

Alternatives in Cybersecurity with comparable market signals.

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Newsroom and topic pages connected to Castle.

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Contextual Research Links

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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 March 3, 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.