Penetration Tester

NinjaOne • Austin, TX

2d • Hybrid

About The Position

The Penetration Tester role is a key part of NinjaOne's core security team, with visibility across the entire organization, from individual developers to executive leadership. You will directly strengthen the security of the NinjaOne platform by identifying and helping resolve technical, security, and architectural vulnerabilities across our applications and environments. The ideal candidate takes a multi-layered approach to uncovering weaknesses in software, web applications, and client-side components to drive meaningful security improvements. This role is also a key contributor to NinjaOne's public bug bounty program, validating externally reported vulnerabilities and working directly with security researchers around the world.

Requirements

• Bachelor's degree in Information Technology, Computer Science, or a related field
• 8+ years of hands-on penetration testing experience, within a broader 5+ years in cybersecurity-related roles
• Strong understanding of security protocols, cryptography, authentication/authorization, and modern attack techniques
• Proficiency with penetration testing tools such as Burp Suite, Caido, and related frameworks
• Experience validating and scoring vulnerabilities (CVSS) and communicating findings to both technical and non-technical audiences; bug bounty triage or program experience is a strong plus
• Ability to develop custom testing tools or scripts (Java, Kotlin, C++, Python, or Go)
• Knowledge of security frameworks and methodologies (OWASP, NIST, BSIMM), threat modeling (STRIDE, DREAD), and system hardening standards (CIS, CSA)
• Solid understanding of Linux and Windows operating systems, enterprise architecture, and TCP/IP and UDP networking fundamentals
• Experience testing or exploiting cloud-native applications; understanding cloud security architecture is a plus
• Strong analytical and problem-solving skills with excellent written and verbal communication; this role communicates directly with external security researchers, engineers, and leadership

Nice To Haves

• Security certifications such as OSCP (highly desired) and/or Security+, CISSP, or CISM are a plus

Responsibilities

• Perform controlled penetration testing of NinjaOne applications, cloud environments, and infrastructure, demonstrating exploitability and documenting risks and remediation steps
• Perform security testing of new and modified API endpoints and features as part of each release cycle, prioritizing coverage against release timelines
• Collaborate with Engineering to validate vulnerabilities, communicate impact, and support secure design and remediation efforts
• Develop custom tools or scripts to support penetration testing, automation, and exploit development
• Perform first-pass triage and validation of bug bounty submissions: reproduce reported issues, assess severity and impact (CVSS), identify duplicates, and route confirmed findings to the appropriate teams
• Communicate directly with external security researchers in clear, professional written English throughout the report lifecycle
• Stay current on emerging threats, TTPs, and cybersecurity trends, applying them to evaluate NinjaOne's exposure and guide security initiatives
• Create clear, comprehensive reports and presentations for both technical and executive stakeholders
• Promote security awareness across the organization, contributing to policies, best practices, and ongoing security education
• Other duties as needed

Benefits

• medical
• dental
• vision
• 401(k) plan
• life insurance coverage
• PTO

What This Job Offers

• Job Type: Full-time
• Career Level: Senior