Penetration Tester III

SOSi • Washington, DC

1d • Onsite

About The Position

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. 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.

Requirements

• 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
• Bachelor’s Degree
• Required: GPEN or GXPN
• CISA AES HVA Lead or Technical Lead , or ability to obtain
• Secret (active) Clearance/Suitability

Nice To Haves

• Plus one of the following: GRTP CRTL OSCP CRTP CMWAPT CEPT CPT LPT

Responsibilities

• Conduct penetration testing across enterprise systems, applications, and network environments
• Perform red team activities to evaluate security controls and identify exploitable weaknesses
• Support continuous penetration testing activities to assess evolving threats and vulnerabilities
• Conduct testing of IoT, mobile, and cloud environments
• Support High Value Asset (HVA) security assessments
• Apply testing methodologies and frameworks including MITRE ATT&CK, OSSTMM, OWASP, NIST, PTES, and ISSAF
• Identify, document, validate, and report vulnerabilities and recommended remediation actions
• Support cyber defense operations through coordination with security engineering, vulnerability management, and incident response teams

What This Job Offers

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