Penetration Tester III

Washington, DC, USA Full-time Clearance Requirement: Secret Company Description Founded in 1989, SOSi is among the largest private, founder-owned technology and services integrators in the defense and government services industry. We deliver tailored solutions, tested leadership, and trusted results to enable national security missions worldwide. Job Description Overview SOSi is seeking a Penetration Tester III to support proactive cyber defense activities in alignment with our customer. This role is responsible for conducting penetration testing and red team activities, assessing security posture across enterprise environments, and supporting identification, validation, and reporting of vulnerabilities to improve cyber defense resilience. Responsibilities u00b7 Conduct penetration testing across enterprise systems, applications, and network environments u00b7 Perform red team activities to evaluate security controls and identify exploitable weaknesses u00b7 Support continuous penetration testing activities to assess evolving threats and vulnerabilities u00b7 Conduct testing of IoT, mobile, and cloud environments u00b7 Support High Value Asset (HVA) security assessments u00b7 Apply testing methodologies and frameworks including MITRE ATT&CK, OSSTMM, OWASP, NIST, PTES, and ISSAF u00b7 Identify, document, validate, and report vulnerabilities and recommended remediation actions u00b7 Support cyber defense operations through coordination with security engineering, vulnerability management, and incident response teams Qualifications + Experience: + Five (5) to seven (7) years of penetration testing experience + Management or team lead experience + Experience performing continuous penetration testing + Experience conducting red team operations + Experience performing IoT, mobile, and cloud penetration testing + Experience supporting High Value Asset (HVA) assessments + Experience applying MITRE ATT&CK, OSSTMM, OWASP, NIST, PTES, and ISSAF methodologies + Education: + Bacheloru2019s Degree + Certifications: Required: + GPEN or GXPN + CISA AES HVA Lead or Technical Lead , or ability to obtain + Plus one of the following: + GRTP + CRTL + OSCP + CRTP + CMWAPT + CEPT + CPT + LPT + Clearance/Suitability : Secret (active) Additional Information Work Environment + Normal office conditions with potential to perform duties in deployed locations. + Core hours of operation are Monday through Friday, 0600 u2013 1700. + May be requested to work evenings and weekends to meet program and contract needs. Working at SOSi All interested individuals will receive consideration and will not be discriminated against for any reason.SOSi is an equal employment opportunity employer and affirmative action employer. All interested individuals will receive consideration and will not be discriminated against on the basis of race, color, religion, sex, national origin, disability, age, sexual orientation, gender identity, genetic information, or protected veteran status. SOSi takes affirmative action in support of its policy to advance diversity and inclusion of individuals who are minorities, women, protected veterans, and individuals with disabilities.

Created: 2026-04-23