SAIC is seeking a Senior Principal Cybersecurity Engineer to support critical Navy communication systems within the DoD. This role is ideal for a hands-on security professional with deep engineering expertise, offensive security experience, and a proven track record finding vulnerabilities, and securing classified and high-security environments. You will serve as a key technical expert collaborating with engineers, program managers, and government personnel to deliver secure, resilient strategic systems. This role is fully ON-SITE in San Diego, CA. Must be local to area. Up to 10% travel involved. JOB DUTIES: • Plan and execute penetration test exercises against systems, networks, and applications simulating real world environment. • Perform network traffic analysis and threat detection using Wireshark and other offensive/defensive security tools. • Architect and harden IT systems, virtualized environments, and network security devices in classified settings. • Conduct vulnerability assessments and develop mitigation strategies aligned with DISA STIGs and DoD standards. • Documenting vulnerabilities, detailing risks, and provide recommendations and measures to improve security posture. • Keep up to date and report to government the latest exploits, hacking techniques, and security tools. REQUIREMENTS: Education and Experience: • Bachelors in Cybersecurity, Computer Science, Engineering and nine (14) years or more experience; master's degree and twelve (12) years or more experience. Years of experience in lieu of degree to be considered. • 5-7 Years relevant hands on experience with Cybersecurity Engineering or related discipline. • 5+ years hands on designing, implementing, or supporting hardened IT systems in classified or high-security environments. • Proven penetration testing and/or red team experience against DoD/IC systems. • Demonstrated experience with air-gap architecture, data diodes, and secure offline transfer mechanisms. Clearance: • Must be a U.S. Citizen. • Must be able to obtain a Top Secret clearance to start. Technical Skills: • Deep knowledge of DoD/IC security frameworks (NIST RMF, DISA STIG, DoD CC SRG). • Proficiency with network security devices (firewalls, IDS/IPS, routers, switches) and secure protocols (IPSec, TLS/DTLS, SSH, S/MIME). • Network traffic analysis using Wireshark. • Strong scripting/programming skills (Python, Bash, PowerShell, C/C++). • Experience with HSM, TPM, and PKI implementation. • Familiarity with virtualization/containers (VMware ESXi, Hyper-V, Docker) in hardened, secure contexts. DESIRED SKILLS: • 10+ years supporting DoD/DoN Navy-focused programs. • Experience with NIWC Pacific or Navy organizations. • Familiarity with NIAP and Common Criteria technologies. • Strong communication skills for senior leadership and multidisciplinary team engagement. • Splunk Enterprise Security experience. • Python, PowerShell, Bash, or other automation/programming experience. • Experience with REST APIs and cybersecurity tool integrations. Certifications: • SecurityX or CISSP certification, including candidates actively pursuing either certification. • Certifications such as OSCP (Offensive Security Certified Professional), CEH (Certified Ethical Hacker), or CISSP are highly valued. • Offensive security certifications (OSCP, GPEN, or GWAPT).