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Fabraix

YC S26

San Francisco, US · Founded 2026 · 2 employees · 13 known investors

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Fabraix develops automated security testing software that probes AI agents for vulnerabilities using adaptive attack techniques, enabling companies to continuously validate the safety of customer-facing AI systems without manual penetration testing.

AI & Machine LearningCybersecurityEnterprise SoftwareArtificial IntelligenceReinforcement LearningUnited States of AmericaAmerica / Canada

Founders & leadership· Y Combinator alumni (S26)

Fabraix was founded in 2026 by Ahmed Aly and ibrahim abdu.

AAAhmed Aly
Ahmed AlyCo-FounderAhmed Aly is co-founder of Fabraix, a startup developing tools to identify failure modes and security vulnerabilities in AI systems. He previously served as an early data scientist at Sequoia-backed Two, where he developed fraud detection systems for B2B payment processing, and has published research in peer-reviewed journals.
IAibrahim abdu
ibrahim abduCo-FounderIbrahim Abdu is a software engineer who previously worked at Meta on AI agent systems and held early engineering roles at Two, a Sequoia-backed B2B startup. He also developed a proprietary compiler and database at TradingHub for algorithmic trading detection, and holds a BA in Philosophy, Politics and Economics from Oxford University.

Investors · 13

WSSlisted by WSS
Y Combinatorlisted by Y CombinatorSan Francisco · $500K

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Amino CapitalreportedPalo Alto · $100K – $10M

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Bridge Venturesreported

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Depth VenturesreportedSan Francisco

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Kleiner PerkinsreportedMenlo Park · $500K – $15M

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Metsu Capitalreported

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Oxonian VenturesreportedPalo Alto

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Pascal Capitalreported

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Ritual CapitalreportedMenlo Park · $100K – $500K

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Script CapitalreportedSan Francisco · $250K – $500K

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Zapierreported

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Related companies · 5

HUDHUD builds evaluation tools and reinforcement learning environments for computer-use AI agents, helping frontier AI labs test and train agents across diverse tasks at scale.
hiloophiloop provides snapshottable, forkable compute infrastructure with built-in observability for AI agents that propose, run, and verify experiments (autoresearch). It offers self-provisioning sandboxes via API, brokered secrets, and per-run tracing with token and cost tracking queryable via SQL, aimed at teams doing autoresearch, model training, and performance-critical development.
UnifyUnify provides AI agents that handle routine business tasks across communications, sales, operations, and engineering by executing pre-built workflows or custom automation. The service serves tech-focused companies and teams looking to offload administrative and repetitive work.
ThetaTheta builds simulation environments and training infrastructure for AI agents specialized to perform enterprise workplace tasks. The company partners with enterprises and research labs to create custom agents that master domain-specific workflows, tools, and decision-making across domains like finance, back office operations, and software development.
Ooak DataOoak Data is an applied AI research lab that converts real enterprise data into reinforcement learning environments for training AI agents. The company serves frontier AI labs, enterprise AI teams, and AI startups with multimodal data infrastructure and digital twins based on anonymized real-world company workflows.

Companies working in the same space as Fabraix.

Legal entities · 1

corporate structure
Fabraix, Inc.

Frequently asked questions

What does Fabraix do?
Fabraix develops automated security testing software that probes AI agents for vulnerabilities using adaptive attack techniques, enabling companies to continuously validate the safety of customer-facing AI systems without manual penetration testing.
Who founded Fabraix?
Fabraix was founded by Ahmed Aly, ibrahim abdu in 2026.
Who are Fabraix's investors?
Fabraix's investors include Vela Partners, WSS, Y Combinator, Amino Capital, Bridge Ventures, Depth Ventures, Kleiner Perkins, Metsu Capital and 5 more.
Where is Fabraix headquartered?
Fabraix is headquartered in San Francisco, US.