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Role description

Software Engineer

Runsybil logoRunsybil
AI-native
TypeFull-time
WorkplaceHybrid
SenioritySenior
LocationNew York, NY
Posted10/28/2025
Engineering

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.

About this Role

We are seeking talented engineers intent on changing the security industry. If you have experience on fast-moving teams, scaling infrastructure with an eye towards reliability, and relentlessly optimizing: we want to talk to you.

What You’ll Do:

  • Build secure, scalable systems for performing automated penetration testing at scale
  • Propose and implement technical initiatives based on product roadmap needs
  • Lead technical design discussions, contribute to team decisions, and provide feedback on engineering approaches
  • Translate ambiguous technical challenges into actionable plans, and execute them in collaboration with the team
  • Serve as the cornerstone of our engineering culture by setting and upholding exemplary standards for code quality, practices, and craftsmanship

We’re Looking For Someone Who Has A Mix of The Following:

  • 6+ years of experience building products or platforms that serve real customers
  • Strong understanding of distributed systems
  • Has been a core contributor to scaling a product to meet increased demand
  • Deep understanding of how to leverage modern AI for maximum impact
  • Bonus: Built agents or agentic workflows
  • Bonus: Relentlessly focused on the customer experience
  • Bonus: Proficiency with cloud platforms (AWS, GCP, or Azure) and container orchestration
  • Seeks autonomy, creative problem-solving, and moving quickly in an ambiguous environment

Location:

Hybrid role based in New York City. Some travel may be required.

What We Offer:

  • Competitive Salary: Attractive startup compensation package with equity options
  • Benefits: Excellent medical, dental, and vision plans. Unlimited PTO
  • Growth Opportunities and Early Impact: Work directly with and learn from industry leaders while driving significant impact in our fast-growing security startup

We understand not every applicant will meet every qualification. We value hard work and potential, and still want to hear from you!

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Company info

Runsybil logo

Runsybil

Automated hacker intuition. We’re hiring!

RunSybil is an AI-native offensive security platform that autonomously discovers and exploits real-world vulnerabilities across modern applications. Sybil agents interact with systems like expert attackers: interacting with systems dynamically, exploring authentication boundaries, finding and validating vulnerabilities, and surfacing real data exposure. The result is continuous, black-box security testing with real validation: no code access required, 90% fewer false positives, and visibility into the vulnerabilities that actually expose data.

Private companySeed
Founded2023
HQSan Francisco, United States
Size24 employees
Unlock human wisdom
ThesisTermsPrivacy
Industry
Computer and Network Security
Funding
  • Seed · Mar 18, 2026

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