Sybil
runsybil.com
Actively hiring
Cybersecurity AI
Penetration Testing
As featured in
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Overview
News
Technologies
Salaries
Products
People
Growth
Offices
Jobs
Financials
Funding and backers
Team
51-200
employees, estimated range
Hiring now
2
open roles
Backers
2
Conviction, Menlo Ventures
Momentum
25/100
a new city, in the news
Last sign of life
this month
a posting or a news item
The story so fareach stage dated by its source: the company's releases, the press, registers, filings
2024
Founded
Tractionpublic signals, read monthly
Web presence
top 5%
of 133.2M domains by links, Common Crawl
Hacker News stories
1
best: 3 points
Backed byfrom the funds' portfolios and accelerator catalogs
Conviction 
Menlo Ventures Investors in similar startupsfunds that back the companies most like this one
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Overview
Sybil builds artificial intelligence penetration testing agents that probe live web applications for exploitable weaknesses. Founded in 2024 by former OpenAI and security industry engineers, it aims to run continuously rather than as an annual engagement. Findings are delivered with reproduction steps that engineers can verify.
News
How OpenAI's Models Escaped Their Sandbox and Slipped Past California's AI Law KQED
California's new frontier AI law doesn't require OpenAI to report its agents' Hugging Face Hack. How often does this happen elsewhere?
Read more
Report
AI Hacking WSJ OpenAI Models Escaped and Hacked a Company in Cybersecurity Test Gone Wrong July 21, 2026
Read more
Report
A new AI-powered computer worm could prove to be the stuff of cybersecurity nightmares
University of Toronto researchers built a worm powered by open-weight AI that adapts to its targets. Experts say it changes the math on cybersecurity defense
Read more
Report
Application Security Dark Reading Parsing Agentic Offensive Security's Existential Threat April 27, 2026
Read more
Report
Report
AI Hacking Business Wire (Black Hat) Black Hat Asia 2026: Award-Winning Journalist and Offensive Security CEO Expose Autonomous Cyber Threats with Growing Implications for APAC April 1, 2026
Read more
Report
RunSybil raises $40M to automate offensive security with AI agents
RunSybil raises $40M to automate offensive security with AI agents - SiliconANGLE
Read more
Report
Exclusive: RunSybil, a startup using AI to automate penetration testing, raises $40M in VC funding in round led by Khosla Ventures
The startup was cofounded by security researchers who worked at OpenAI and Meta.
Read more
Report
Munich Cybersecurity Conference 2026: Moving Into the Twilight Zone
At Munich's twin security gatherings, leaders warned that cyber conflict, transatlantic rifts and weaponised AI are pushing the rules-based order into a perilous transition, where deterrence falters, norms erode and digital sovereignty trumps multistakeho
Read more
Report
AI's Hacking Skills Are Approaching an 'Inflection Point'
AI models are getting so good at finding vulnerabilities that some experts say the tech industry might need to rethink how software is built.
Read more
Report
Show more news
Tech stack
Technologies named in job postings at Sybil over the last 12 months, by layer, with the share of postings for each.
Technologies in use
22
Postings analysed
9
Stack modernity
82/100AI adopter
Languages
Python
JavaScript
TypeScript
Frameworks & libraries
React.js
OpenTelemetry
Databases
PostgreSQL
Cloud & platforms
OpenAI
AWS
Azure
GCP
AI & ML
LLM
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Full Sybil tech stack
22 technologies · by team · pay by technology · changes · similar stacks
Salary insights
Compensation ranges based on this company's open jobs
Median
$210k
Typical range
$210k
Open positions
1
1
Jobs
Middle
100%
| Level | Jobs | Median | Typical range |
|---|---|---|---|
| Middle | 1 | $210k | $210k |
Highest paying role
Security Software Engineer
$210k
Normalized to USD per year
Growth
Hiring Momentum
58/100
Growing
Open positions
2
0 opened / 6 closed in 30 days
Median time-to-fill
77 days
faster than 17% of the market
ATS activity
Every ~3 hours
Today
Hiring Dynamics
+100%
Hiring Focus
The percentage next to each role is its share of the company's job openings over the last 90 days; the arrow shows the shift versus the previous period.
Backend
50% ▼
Security
50% ▼
Activity Timeline
New location: United States
Sep 2026
Added Machine Learning to stack
Sep 2026
Added OWASP to stack
Sep 2026
Added Agentic Workflows to stack
Sep 2026
Added Red Teaming to stack
Aug 2026
Added AI Agents to stack
Aug 2026
Added OpenAI to stack
Aug 2026
Offices
Where the company hires and what each office is for
Cities
2
Hiring now
1
Countries
1
Busiest office
New York
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Headquarters
Builds here
Office with open vacancies
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San Francisco
United States
HQ
10-50 est. staff
New York
United States
Engineering / R&D
1 open roles 1 posted in 90 days 100% engineering 50-200 est. staff
hires for AI/ML
Jobs
$170k – $210k per year • Remote (United States) • Full-Time • 4+ years exp
Python
JavaScript
Prompt Engineering
AI Agents
LLM
OpenAI
Red Teaming
Frontend
React.js
Apply
≈ $178k – $334k per year (Estimated) • Hybrid • Full-Time • 4+ years exp • PhD • New York
OpenAI
Machine Learning
Apply