---
title: 'Product Software Engineer at RunSybil'
canonical: 'https://feeny.ai/job/product-software-engineer-runsybil-united-states-kdfnge6zpsev'
type: 'job'
last_seen: '2026-09-08'
---

# Product Software Engineer at RunSybil

- **Company:** RunSybil
- **Location:** United States
- **Employment:** full-time
- **Work type:** remote
- **Posted:** 2026-03-11
- **Last confirmed live:** 2026-09-08
- **Apply:** https://jobs.ashbyhq.com/runsybil-jobs/1ce3872b-7271-4e10-8e2a-d980f16de978

## 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.

## About this Role

Building Sybil means working on hard problems at the intersection of AI and offensive security. This is a role for engineers who want real ownership over what they ship and care about the quality of what they build. The engineers who thrive here move quickly on ambiguous problems, build infrastructure that scales, and care deeply about the quality of what they ship.

What You'll Do:

- Design, build, and ship secure, scalable systems that power automated penetration testing at scale
- Own features end-to-end: from technical design through deployment and production monitoring
- Identify gaps in the product and propose technical initiatives to close them, without waiting to be asked
- Lead technical design discussions and contribute meaningfully to decisions on architecture, tooling, and approach
- Translate ambiguous challenges into clear plans and execute them in close collaboration with the team
- Scale backend systems and data infrastructure to stay ahead of growing customer demand
- Integrate and extend AI and LLM capabilities, including agents and agentic workflows, directly into the Sybil product
- Take ownership of reliability and performance, including when things break and how to recover
- Set and uphold high standards for code quality, craftsmanship, and engineering culture as we grow

We're looking for someone who brings:

- 6+ years building products or platforms that serve real customers
- Strong foundation in distributed systems, including how they fail and how to recover
- Experience as a core contributor on a team that scaled a product to meet significantly increased demand
- Proficiency with Python and TypeScript; comfort working across the stack when needed
- Familiarity with cloud platforms (AWS, GCP, or Azure), containerization, and modern deployment practices
- Deep understanding of how to apply modern AI and LLMs for real product impact
- Experience with observability tooling and a track record of debugging hard problems in production
- An interest in or background in security, penetration testing, or offensive security tooling
- A track record of picking up what needs to be done and doing it, without needing a defined lane
- Strong communication skills: you can explain technical tradeoffs clearly to teammates and collaborators

Location: Hybrid role based in New York City.

Compensation: The base salary for this full-time position ranges from $180,000-$250,000. In addition to base salary, we offer meaningful equity. We want everyone here to have ownership in what we're building.

Diverse teams build better products. RunSybil is committed to hiring people who bring different perspectives, lived experiences, and backgrounds to our work. We encourage candidates of all races, ethnicities, gender identity and expression, sexual orientation, disability or medical conditions, ages, religions, and socioeconomic backgrounds to apply. Pursuant to the San Francisco Fair Chance Ordinance, we will consider for employment qualified applicants with arrest and conviction records. If you're excited about this role but don't check every box, we still want to hear from you.

## About RunSybil

## Core Business
- **Primary industry**: Computer and Network Security / Offensive Security (AI-powered penetration testing)
- **Target customers**: Enterprise B2B – security teams at high-risk, multi-tenant, or rapidly deploying organizations
- **Mission**: “Automate hacker intuition” – replace periodic pentests and bug bounties with continuous, AI-driven validation of exploitable vulnerabilities.

## Products & Services
- **Sybil Platform**: An AI agent that continuously tests applications and infrastructure by reasoning like an elite human attacker. It chains vulnerabilities across code, APIs, cloud, and infra to surface only real, exploitable paths. Deployed on every deployment, it provides feedback on pull requests and enables Continuous Threat Exposure Management (CTEM) validation.

## Market Standing
- **Valuation/Market Cap**: Not disclosed
- **Key Metric**: Total funding – $40M (Seed round, March 2026)
- **Notable Investors/Partners**: Lead investor Khosla Ventures; 8 total investors in the seed round
- **Growth Signals**: Headcount grew 185.7% YoY to ~10 employees; monthly LinkedIn follower growth of +8.0% and yearly +285.8%; recent $40M raise signals strong investor confidence.

## Competitive Advantages
- **AI-native reasoning**: Sybil doesn't scan for signatures – it reasons like a human attacker, chaining multi-layer vulnerabilities and validating exploitability.
- **Continuous, context-aware testing**: Re-evaluates the attack surface on every deployment, adapting to changes rather than running periodic generic checks.
- **Reduced false positives**: Claims 90% fewer false positives by proving actual exploitability, eliminating triage burden.
- **Team pedigree**: Founders and early team hail from OpenAI, Meta, Mandiant, NCC Group, and Trail of Bits – combining frontier AI research with elite red-team experience.

## Strategic Focus
- Scaling the engineering and go-to-market teams to expand the platform’s coverage and customer adoption.
- Replacing traditional bug bounties and point-in-time pentests with continuous, AI-driven offensive security.
- Building a “company-survival mindset” and prioritizing velocity, shipping, and quality of thinking.

## Why Work Here
- **Culture**: “Built by researchers. Driven by conviction.” Emphasis on shipping fast, thinking like an attacker, preempting what’s next, and engineering craft.
- **Work model**: Hybrid with hubs in San Francisco and New York City; remote or hybrid options available.
- **Benefits**: Comprehensive medical/dental/vision (100% employee, 80–85% dependents), unlimited PTO (20-day suggested minimum), 12 weeks paid parental leave, 401(k) with 3% auto-enrollment, mental health and wellness support, commuter benefits, company-provided laptop, regular team onsites.
- **Team**: Small, high-caliber group (ex-OpenAI, Meta, Mandiant, NCC Group, Trail of Bits) working on the leading edge of AI and security. Interview process is structured, collaborative, and fast – LLM use encouraged.

## Sources
1. [runsybil.com](https://www.runsybil.com/)
2. [runsybil.com/company](https://www.runsybil.com/company)
3. [runsybil.com/careers](https://www.runsybil.com/careers)
4. [builtin.com](https://builtin.com/company/runsybil)
5. [linkedin.com](https://www.linkedin.com/company/runsybil)

## Other roles at RunSybil

- [Security Analyst](https://feeny.ai/job/security-analyst-runsybil-united-states-g531z30tq8y7) — United States
- [Software Engineer I](https://feeny.ai/job/software-engineer-i-runsybil-new-york-k0thqp47baj5) — New York, NY
- [Forward Deployed Engineer](https://feeny.ai/job/forward-deployed-engineer-runsybil-united-states-z6x7c0j9xtj8) — United States
- [Sales Development Manager](https://feeny.ai/job/sales-development-manager-runsybil-san-francisco-dwexshbs2sca) — San Francisco, CA
- [Senior Account Executive, Technology](https://feeny.ai/job/senior-account-executive-technology-runsybil-san-francisco-ptqhwq1mrems) — San Francisco, CA
- [Security Software Engineer](https://feeny.ai/job/security-software-engineer-runsybil-united-states-1pj8gsxey1nz) — United States
- [SRE/Infrastructure Engineer](https://feeny.ai/job/sre-infrastructure-engineer-runsybil-new-york-j7k1tddtxe0v) — New York, NY
- [Machine Learning Engineer](https://feeny.ai/job/machine-learning-engineer-runsybil-san-francisco-4gn81en20jpw) — San Francisco, CA / New York, NY
- [Product Software Engineer](https://feeny.ai/job/product-software-engineer-claryo-san-francisco-rmj9y1fs2zc6) — San Francisco, CA