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SIXGEN’s mission is to deliver agile, mission-ready cybersecurity solutions that empower government and critical infrastructure organizations to stay ahead of advanced cyber threats. We combine innovation, deep expertise, and cutting-edge capabilities to uncover vulnerabilities, protect vital systems, and ensure operational superiority in an ever-evolving digital landscape. POSITION OVERVIEW Position: Senior Web Application Penetration Tester Job Type: Full-time Location: Remote Clearance Requirements: Must be able to obtain a Secret Clearance Travel Requirements: Up to 10% Experience: 5+ years   WHAT YOU'LL DO We are seeking a skilled and motivated Senior Web Application Penetration Tester to join our growing cyber operations team. The ideal candidate will possess deep expertise in web application security testing, vulnerability research, and exploitation techniques, with the ability to identify complex attack paths and develop creative solutions to challenging security problems. This role goes far beyond automated scanning. Successful candidates will conduct in-depth assessments of web applications, APIs, mobile applications, and supporting infrastructure while leveraging custom tooling, manual testing techniques, and advanced exploitation methodologies to uncover impactful security findings. KEY RESPONSIBILITIES Web Application Security Assessments Conduct penetration testing of web applications, APIs, mobile applications, databases, and client-side technologies. Perform application enumeration, endpoint discovery, vulnerability research, and exploitation activities. Identify, validate, and assess vulnerabilities across complex environments. Analyze attack paths and security weaknesses to determine business and operational impact. Technical Analysis & Research Develop and utilize custom tools, scripts, and payloads to support testing activities. Perform network mapping, vulnerability analysis, and security assessments across applications and supporting infrastructure. Research emerging vulnerabilities, attack techniques, and exploitation methodologies. Support post-exploitation activities involving cloud and enterprise environments when applicable. Client Engagement & Reporting Collaborate with clients and internal teams to define scope, review findings, and recommend remediation strategies. Communicate technical concepts and findings to both technical and non-technical stakeholders. Produce comprehensive reports, including detailed findings, exploitation procedures, risk analysis, and mitigation recommendations. Participate in client meetings and provide ongoing updates throughout assessment activities. QUALIFICATIONS 5+ years of experience in web application penetration testing or offensive cybersecurity. Demonstrated experience conducting manual web application security assessments. Knowledge of modern web application vulnerabilities, attack methodologies, and exploitation techniques. Experience with network mapping, vulnerability scanning, and penetration testing methodologies. Familiarity with NIST 800-series standards and cybersecurity best practices. Experience developing scripts, payloads, or custom testing tools. Strong analytical, problem-solving, and communication skills. Preferred Certifications One or more of the following certifications is strongly preferred: CWES (preferred) CWEE (preferred) OSCP OSWA OSWE CRTO GWAPT Other relevant hands-on offensive security certifications PREFERRED QUALIFICATIONS Experience with cloud environments and post-exploitation activities. Experience with Active Directory security assessments. Familiarity with FISMA compliance requirements. Experience supporting government or regulated industry clients. Proficiency with common offensive security tools and frameworks. COMPENSATION & BENEFITS At SIXGEN, we are committed to fair an