Systems Security Engineer

Apex Systems is seeking a Systems Security Engineer to support a DoD client in Dahlgren, VA. This role is focused on vulnerability management, system hardening, and cyber defense operations within a secure enterprise environment.

The ideal candidate will have hands-on experience with DoD cybersecurity tools, network security principles, and risk mitigation strategies, and will play a key role in strengthening the organization's overall security posture., * Conduct vulnerability scans and identify security weaknesses across systems, applications, and networks

• Utilize DoD security tools such as ACAS, HBSS, and related platforms
• Perform application vulnerability assessments and analyze configuration data to identify systemic risks
• Apply cybersecurity principles (confidentiality, integrity, availability, authentication, non-repudiation)
• Implement system, network, and OS hardening techniques (e.g., least privilege, segmentation, logging)
• Troubleshoot and resolve cyber defense infrastructure issues and anomalies
• Perform impact and risk assessments to support remediation efforts
• Analyze threat environments and provide actionable insights to improve security posture
• Implement and maintain access controls, VPNs, and encryption protocols
• Support malware defense using IDS/IPS, anti-malware, and endpoint security tools
• Perform other duties as assigned

• Bachelor's degree or equivalent experience
• 2-5 years of relevant cybersecurity / systems security experience
• Active DoD 8570 IAT Level II certification (e.g., Security+)
• Active Secret clearance required (Top Secret preferred)
• Strong knowledge of:

• Networking protocols (TCP/IP, DNS, DHCP)
• Network security methodologies and architecture (defense-in-depth, zero trust)
• System, network, and OS hardening techniques
• IDS/IPS tools and vulnerability management
• Application security and common vulnerabilities

• Experience supporting one or more of the following:

• Windows
• Linux/Unix
• Mobile platforms (iOS/Android), * Knowledge of cyber threats, vulnerabilities, and attack vectors

• Experience with network traffic analysis and monitoring
• Familiarity with Identity and Access Management (IAM) (PKI, SAML, OAuth, etc.)
• Experience with RMF / NIST 800-53 frameworks
• Understanding of wireless and transmission technologies (Wi-Fi, RFID, Bluetooth, VoIP)
• Ability to analyze and respond to various attack types (insider, passive, active, etc.)

Physical Requirements

• Ability to stand or walk for extended periods
• Ability to lift up to 10-20 lbs
• Occasional bending, twisting, or squatting

Apex Systems is a leading technology services firm that provides innovative solutions to government and commercial clients. We specialize in delivering high-quality talent and expertise across cybersecurity, infrastructure, cloud, and digital transformation initiatives., Everforth Apex is a world-class IT services company that serves thousands of clients across the globe. When you join Everforth Apex, you become part of a team that values innovation, collaboration, and continuous learning. We offer quality career resources, training, certifications, development opportunities, and a comprehensive benefits package. Our commitment to excellence is reflected in many awards, including ClearlyRated's Best of Staffing in Talent Satisfaction in the United States and Great Place to Work in the United Kingdom and Mexico. Everforth Apex uses a virtual recruiter as part of the application process. Click for more details.