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Salary: USD 206,278 - 242,680 / annual
Horizon3.ai is a fast-growing remote cybersecurity company building NodeZero, an autonomous pentesting platform that helps organizations proactively discover, fix, and verify exploitable attack vectors before criminals exploit them. The platform is used by IT Ops/SecOps teams, consulting pentesters, and MSSPs/MSPs across organizations ranging from educational institutions to Global 100 enterprises.
You will drive key workstreams within the external attack capabilities of NodeZero. The external attack surface is where most breaches begin—it spans domains, certificates, cloud assets, code repositories, leaked data, identities, SaaS tenants, and the relationships connecting them. This role focuses on turning the manual reconnaissance and multi-step attack work that skilled operators perform by hand into safe, reliable, repeatable workflows that run autonomously at scale.
Key responsibilities include:
- Design, build, and maintain highly scalable reconnaissance workflows in production-grade Python that discover, enumerate, and fingerprint external-facing assets and services.
- Research and parse large volumes of external-facing data (unstructured sources, banners, web content, documents, error output) and turn it into accurate, actionable information.
- Develop robust approaches to data that is difficult to reason about in code, building parsing and enrichment that holds up across real environments.
- Collect, store, and connect high volumes of information; extend attack-path modeling and graph data models to represent new identity, privilege, and relationship paths.
- Traverse identity relationships across the external surface (accounts, tenants, SSO, federation, exposed credentials, third-party services) to find paths from exposure to compromise.
- Automate multi-step attack workflows that chain discovery, credential access, initial access, and post-exploitation into complete, safely proven attack paths.
- Research emerging external tradecraft and turn it into production attack content, emphasizing techniques that succeed against hardened, well-monitored targets.
- Stand up and maintain representative test environments to validate, demonstrate, and regression-test attack scenarios.
- Build for production safety and scale, respecting target and customer environments, rate limits, and scope.
- Contribute to priorities and coverage roadmap based on real customer environments, threat intelligence, and emerging techniques.
- Mentor teammates and support their growth; help define team standards for code quality, research rigor, and operational safety.
- Collaborate cross-functionally with engineers, product managers, and customer-facing teams; author internal documentation and external research/blog posts.
Requirements:
- 5+ years of hands-on experience in offensive security, security research, and/or security-focused software engineering, with recent work building and shipping offensive tooling.
- Deep, hands-on offensive experience against external attack surfaces, from reconnaissance through initial access and post-exploitation.
- Demonstrated experience building reconnaissance and discovery systems that run at scale (not just one-off scripts).
- Strong skill at researching and parsing large amounts of messy, unstructured external data and turning it into usable, trustworthy information.
- Experience collecting, storing, and connecting high volumes of data and reasoning about it as relationships (identities, assets, trust).
- Command of identity-focused tradecraft: credential access, password and token attacks, SSO and federation weaknesses, moving among identities, tenants, and services.
- Experience automating multi-step attack workflows end to end.
- Strong software engineering fundamentals with Python and a track record of shipping and maintaining production-quality code (not just scripts and proofs of concept).
- Ability to independently research unfamiliar systems and technologies and rapidly build deep, practical expertise.
- Strong written and verbal communication, including clear technical documentation.
- Passion for building products, not just finding vulnerabilities.
Preferred qualifications:
- OSCP, OSEP, CRTO, or equivalent offensive certifications.
- Experience with large-scale internet data sources and tooling (certificate transparency, passive DNS, internet-wide scanning).
- Experience with cloud, SaaS, and hybrid identity attack surfaces (Entra ID, Okta, AWS, similar), including on-prem to cloud pivots.
- Experience with external to internal pivoting and how perimeter footholds lead into additional access.
- Experience with graph databases, attack-path analysis, data lakes, or high-volume data storage and processing.
- Experience developing or contributing to offensive or recon tooling.
- Public contributions to the field: open-source tools, technical blog posts, conference talks, or published CVEs.
- Experience building production-safe autonomous or automated offensive tooling.
The role is fully remote with up to 5% travel required. Horizon3 offers competitive compensation, equity packages (stock options), health/vision/dental insurance, flexible vacation, and generous parental leave.
