Network Security Engineer

Network Security Engineer

Apex Systems is seeking a Network Security Engineer to join a Chicago-based cybersecurity team. This role will lead and execute penetration testing operations across applications, networks, and enterprise environments. The ideal candidate will bring deep technical expertise in offensive security, hands-on experience in vulnerability research and exploitation, and a collaborative mindset to support mission-critical systems.

Key Responsibilities:

• Conduct penetration tests in accordance with DHS and industry best practices.
• Perform assessments on web applications, networks, and infrastructure using commercial and open-source tools.
• Execute testing activities safely and effectively under defined operational guidelines.
• Document findings in detailed, actionable reports with remediation recommendations.
• Collaborate with SOC, engineering, and defensive security teams to validate and remediate vulnerabilities.
• Contribute to internal tool development, methodology refinement, and team knowledge sharing.

Required Qualifications:

• Bachelor's degree in a related field with 8+ years of experience, or Master's degree with 6+ years.
• Ability to perform web application, network, and infrastructure testing using both commercial and open-source tools.
• At least 8 years of experience in one or more of the following: incident detection and response, malware analysis, or cyber forensics.
• Proficiency with at least 3 of the following tools: Kali Linux, Metasploit, Burp Suite, Nmap, Cobalt Strike, Nessus, WebInspect, Scuba, AppDetective.
• Must hold one or more of the following certifications: GPEN, GWAPT, GISF, GXPN, OSCP, OSCE, OSWP, OSEE, CISSP, CEH.
• U.S. citizenship required.

Preferred Qualifications:

• Prior experience in IT security, auditing, or system administration.
• Background in Computer Science or a related technical discipline.
• Experience in network architecture, configuration, or troubleshooting.

EEO Employer

Apex Systems is an equal opportunity employer. We do not discriminate or allow discrimination on the basis of race, color, religion, creed, sex (including pregnancy, childbirth, breastfeeding, or related medical conditions), age, sexual orientation, gender identity, national origin, ancestry, citizenship, genetic information, registered domestic partner status, marital status, disability, status as a crime victim, protected veteran status, political affiliation, union membership, or any other characteristic protected by law. Apex will consider qualified applicants with criminal histories in a manner consistent with the requirements of applicable law.