General Interest - Join our talent community! at RunSybil

RunSybil·3d ago

Role details

Work type

Hybrid

Employment

Full-Time

Job description

About RunSybil

RunSybil is an AI security startup scaling offensive security services by automating hacker intuition. We’re building Sybil: an AI-powered penetration testing product that finds vulnerabilities faster than human hackers. Backed by strong investor support and early customer traction, our team is composed of experts from the likes of OpenAI, Meta, Mandiant, Palantir, Cruise, and Trail of Bits.

We’re always excited to connect with curious, driven people who want to shape the future of AI and security. If you don’t see an open role that fits but think you could add value, drop us your resume. We’ll reach out if something opens up that matches your skills or interests.

Why work at RunSybil

Culture: Small, high-agility startup where “velocity and iteration” trump lengthy planning. Team of builders from OpenAI, Meta, Mandiant, and Trail of Bits. Emphasis on creative, hacker-like thinking – “our product automates hacker intuition.”
Remote/Hybrid Policy: Hybrid with hubs in San Francisco and New York City. Remote or hybrid options available.
Benefits:
- Comprehensive insurance: Medical, dental, vision (100% employee, 80–85% dependents), travel insurance, pet insurance discounts.
- Wellbeing: Mental health, coaching, fitness, primary care, healthcare navigation support, Employee Assistance Program.
- Time off: Unlimited PTO (20-day suggested minimum), 14 company holidays, 12 weeks paid parental leave + flexible return.
- Financial: 401(k) with 3% auto-enrollment, employee discounts, financial planning tools, commuter benefits.
- Work & Culture: Company-provided laptop, regular team onsites/offsite, structured interview process that encourages LLM use.

About RunSybil

Company Overview

One-liner: RunSybil is an AI-native offensive security platform that autonomously discovers and exploits real-world vulnerabilities across modern applications, acting like an elite human researcher but at machine speed.
Entity Type: Private (Seed stage – $40M raised)
Headquarters: San Francisco, United States (with a hub in New York City)
Founded: 2023
Founders: Ari Herbert-Voss (CEO) and Vlad Ionescu (CTO)

Core Business

Primary industry: Computer and Network Security (AI-powered offensive security / automated penetration testing)
Target customers: Enterprise security teams (B2B) – companies needing continuous application, cloud, and infrastructure security testing
Mission or purpose: “Automate hacker intuition” – give every enterprise team the equivalent of a world-class red teamer that never sleeps

Products & Services

[Sybil – AI Pentesting Platform]: An AI-driven offensive security platform that continuously tests applications and infrastructure for exploitable vulnerabilities. It maps the entire stack (code, APIs, cloud, infra), reasons like an attacker, chains vulnerabilities across layers, and validates exploitability. Delivers findings on every pull request and re-evaluates with every deployment. Covers high-risk application testing, continuous attack surface monitoring, multi-tenant/business logic testing, bug bounty/pentest replacement, and cloud/infrastructure security validation. (Type: SaaS platform)

Market Standing

Valuation/Market Cap: Not disclosed (private)
Key Metric: Total Funding – $40M (Seed round, March 2026)
Notable Investors/Partners: Led by Khosla Ventures (8 investors total). Team alumni include OpenAI, Meta, Mandiant, NCC Group, Trail of Bits.
Growth Signals: LinkedIn followers grew +309.5% year-over-year (2,471 followers as of early 2026). Rapidly hiring across engineering, ML, and security roles. Product already delivering measurable improvements to security posture and development velocity for customers.

Competitive Advantages

AI-native reasoning: Sybil doesn’t rely on signature scanning – it dynamically interacts with systems, explores authentication boundaries, and chains vulnerabilities the way elite human attackers do, producing 90% fewer false positives.
Continuous, pre-validated findings: Covers every deployment, not point-in-time pentests. Findings are validated as exploitable, eliminating triage burden.
Full-stack coverage: Tests code, APIs, cloud, and infrastructure as an integrated system, finding attack paths that siloed scanners miss.
Founder expertise: CEO was first security hire at OpenAI and contributed to GPT-3/Codex; CTO led offensive security at Meta and was core Llama offensive research lead. Combined AI research and elite red teaming background.

Strategic Focus

Current priorities: Scaling the platform to become the standard for continuous offensive security (CTEM Validation phase). Expanding coverage for multi-tenant and business logic testing. Building out the engineering and research team to accelerate product iteration.
Growth direction: Replacing traditional bug bounty programs and periodic pentests with continuous, AI-driven testing. Enabling enterprises to move from reactive security to proactive, automated validation.

Sources

Job description

About RunSybil

Why work at RunSybil

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