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WebApp Offensive Security Software Engineer

Horizon3 AI· Engineering
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Remote$196k - $242k + equityFull-timePosted 4mo ago

About the role

Senior/Staff Offensive Security Software Engineer with extensive web application penetration testing experience and growing interest in AI-enhanced security techniques. Design, develop, and integrate web app pentesting content into the NodeZero platform, leveraging AI technologies to advance offensive security capabilities.

Responsibilities

  • Perform hands-on, full-scope web application penetration tests against real customer applications, alongside benchmark and lab targets, to surface vulnerabilities and attack paths.
  • Review NodeZero results on live customer engagements to identify coverage gaps, blind spots, and missed opportunities — the edge cases and corner-case attack scenarios that autonomous testing doesn't yet handle.
  • Manually reproduce and validate edge cases, building reliable, production-safe proof-of-concept exploits and clear test cases that demonstrate the gap end to end — including against live customer environments without disrupting them.
  • Partner closely with software engineers to translate findings into product improvements — defining detection logic, attack content, expected behavior, and remediation so NodeZero handles those cases going forward.
  • Build and maintain a library of regression and benchmark test cases so newly added coverage doesn't silently regress over time.
  • Monitor production pentests for missed findings and false positives; create and triage Jira tickets to drive issues to resolution.
  • Work directly with customers and internal teams to investigate findings, explain attack paths, and address questions about web application coverage and results.
  • Author technical blog posts and research write-ups showcasing new exploits, edge cases, and attack methodologies.
  • Mentor teammates and contribute to continuous improvement of team processes, methodology, and testing standards.

Qualifications

  • Experience conducting full scope web application pentests
  • Experience with proxy tools like Burp and with browser developer tools
  • Proficient in object-oriented programming and test-driven development, with strong analytical and problem-solving skills.
  • Experience applying AI-assisted development tools to security research and automation tasks
  • Curiosity about emerging AI technologies.
  • Skilled in designing, evaluating, and communicating technical solutions across systems, APIs, algorithms, and data structures.
  • Familiarity with relational and graph databases, particularly Postgres and Neo4j.
  • Strong written and verbal communication, including technical documentation.
  • Ability to manage multiple priorities, work independently, and mentor teammates of varying experience levels.
  • Quick to learn and adopt new technologies as needed.
  • History of recognized security research, including documented CVE discoveries and responsible disclosure
  • Track record of successful bug bounty contributions

Skills

Required:Web application pentestingBurp SuiteProgrammingAI-assisted security researchCommunication

Benefits

  • Inclusive Team: We value diversity and promote an inclusive culture where everyone can thrive.
  • Growth Opportunities: Be part of a dynamic and growing team with numerous career development opportunities.
  • Innovative Culture: Work in a collaborative environment that encourages creativity and out-of-the-box thinking.
  • Hybrid & Remote Work: We embrace a mix of remote and hybrid work models depending on role and location, including our Chicago office, where some roles require regular in-office presence.
  • Competitive Compensation: We offer competitive salary, equity and benefits. Our benefits include health, vision & dental insurance for you and your family, a flexible vacation policy, and generous parental leave.
Last updated Oct 8, 2026. Interested? Apply on the company site.

About Horizon3 AI

Only Pentesting Platform Proven in Production

Continuously assess, fix, and verify your security posture. Securing enterprises across many attack surfaces.

PentestingSecurity PostureThreat DetectionVulnerabilitiesRisk AssessmentOffensive Security
Company profileWebsite

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