Cyber Security Engineer – Penetration Tester (Journeyman)

We are an employee-centric company that truly values our team members and the contributions they make to our customers and the missions they support. We pride ourselves on being forward-leaning thinkers and on building teams that are, and continue to be, technically proficient across a broad range of cyber mission areas. OneZero full-time employees receive a highly competitive benefits package, including health, dental, vision, and life insurance, a 401(k) with company matching, paid time off and holidays, an employee referral program, and educational assistance. Additional details are available on our website: https://www.onezerollc.com/careers/ Position Summary OneZero Solutions is seeking a Journeyman-level Cyber Security Engineer – Penetration Tester to support the U.S. Coast Guard in Alexandria, VA. The selected candidate will assess the cyber security posture of Coast Guard operational networks through adversary emulation, conducting red team operations, penetration tests, and phishing assessments. This role also performs cyber threat emulation during scripted exercises to train DoD Cyber Protection Teams and delivers clear reports and briefs that turn technical findings into actionable recommendations. Adversary Simulation Deploy, configure, and operate Command and Control (C2) frameworks such as Cobalt Strike, Havoc, Mythic, and Sliver. Apply tactics, techniques, and procedures (TTPs) for initial access, lateral movement, privilege escalation, persistence, and data exfiltration. Leverage proprietary and open-source offensive security tool sets effectively to achieve engagement objectives. Execute phishing assessments. Infrastructure Monitor, manage, and maintain cloud and on-premise infrastructure used during assessments. Use Git repositories to maintain operational tools and scripts. Penetration Testing Conduct internal and external penetration testing. Perform network mapping and enumeration. Assess web and mobile applications. Perform database scans. Assess Active Directory attack paths using tools such as BloodHound. Security Assessments Assess the cyber security posture of Coast Guard operational networks through adversary emulation. Develop reports and briefs detailing findings and recommendations for all completed assessments. Perform cyber threat emulation during scripted exercises to train DoD Cyber Protection Teams. Required Qualifications 2 to 3 years of relevant experience. Active Top Secret security clearance with SCI eligibility. Hands-on experience with computers and network security. Experience conducting phishing campaigns or social engineering. Hands-on experience with red team tasks and penetration testing. Familiarity with malware development and EDR/AV bypass strategies. Experience with PowerShell, C, C++, or Python. Hands-on experience using C2 frameworks such as Cobalt Strike, Sliver, Havoc, or similar. Preferred Qualifications Experience supporting Red Team or offensive cybersecurity operations. Experience with web application, network, wireless, cloud, or infrastructure penetration testing. Familiarity with tools such as Nmap, Burp Suite, Metasploit, BloodHound, Wireshark, or similar security testing tools. Knowledge of common attack frameworks and methodologies, including MITRE ATT&CK. Experience developing penetration testing reports and presenting technical findings. Active industry-recognized cybersecurity certifications such as OSCP, CEH, PenTest+, GPEN, or comparable certifications. Certifications Candidates must hold a DoD 8570/8140-compliant Information Assurance Technical (IAT) Level II or Level III certification, along with an offensive security certification. Offensive Security Certification (any one of the following) GIAC Penetration Tester (GPEN) Red Team Apprentice Course (RTAC) Or equivalent IAT Level II (any one of the following, or one of the IAT Level III certifications noted below) CompTIA Security+ CE CompTIA CySA+ CCNA Security GICSP GSEC SSCP IAT Level III (any one of the following) CompTIA CASP+ CE (SecurityX) CISSP (or Associate) CISA CCNP Security GCED GCIH Education Bachelor's degree (BA/BS) or equivalent years of relevant experience. OneZero Solutions, LLC is an Equal Opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or protected veteran status. To request an accommodation, please contact us at recruiting@onezerollc.com or call (202) 987-2580.