RunSybil is an autonomous offensive security solution. Find exploitable vulnerabilities before a breach, eliminate noise, and remediate at enterprise scale. Backed by Menlo and Conviction.
About the role
We are looking for a Security Software Engineer who ships. You will own the research and development of offensive capabilities that power Sybil, working end-to-end from vulnerability discovery through production delivery. This is a role for someone who finds their own problems, builds their own solutions, and raises the bar for everyone around them.
What they're looking for
- 4 or more years of software engineering experience, with meaningful time in offensive security contexts
- Hands-on experience finding vulnerabilities across a variety of targets, whether through red teaming, bug bounty, CTF, or production pentesting
- Strong Python fundamentals: you have designed, deployed, and maintained backend systems in production
- Comfort with modern JavaScript and React, you can own a feature across the full stack
- Experience building with LLMs or generative AI tools, including prompt engineering and integrating model outputs into real workflows
- A builder's instinct: you default to figuring things out, not waiting for direction
More about this role
Founded in 2023 by Ari Herbert-Voss and Vlad Ionescu, RunSybil is on a mission to automate hacker intuition. We’re building Sybil: an AI-driven pentester that discovers vulnerabilities before they’re exploited. As adversaries adopt AI to increase their attack surface, we’re putting cutting-edge offensive security into the hands of defenders. Backed by strong investor support and early customer traction, our team is composed of experts from OpenAI, Meta, Mandiant, Palantir, Cruise, Trail of Bits, and Aptiv.
We are looking for a Security Software Engineer who ships. You will own the research and development of offensive capabilities that power Sybil, working end-to-end from vulnerability discovery through production delivery. This is a role for someone who finds their own problems, builds their own solutions, and raises the bar for everyone around them.
You will work closely with our engineering and product teams to translate offensive security intuition into repeatable, AI-driven capabilities. If you thrive in ambiguity, move fast, and want your work to have a direct impact on a product customers rely on, this is the role for you.
Research and develop offensive agentic capabilities...
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