Network Security Engineer

Job#: 2091354

Job Description:

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. If you have visited our website in search of information on employment opportunities or to apply for a position, and you require an accommodation in using our website for a search or application, please contact our Employee Services Department at or .

Apex Systems is a world-class IT services company that serves thousands of clients across the globe. When you join 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.

Apex Benefits Overview: Apex offers a range of supplemental benefits, including medical, dental, vision, life, disability, and other insurance plans that offer an optional layer of financial protection. We offer an ESPP (employee stock purchase program) and a 401K program which allows you to contribute typically within 30 days of starting, with a company match after 12 months of tenure. Apex also offers a HSA (Health Savings Account on the HDHP plan), a SupportLinc Employee Assistance Program (EAP) with up to 8 free counseling sessions, a corporate discount savings program and other discounts. In terms of professional development, Apex hosts an on-demand training program, provides access to certification prep and a library of technical and leadership courses/books/seminars once you have 6+ months of tenure, and certification discounts and other perks to associations that include CompTIA and IIBA. Apex has a dedicated customer service team for our Consultants that can address questions around benefits and other resources, as well as a certified Career Coach. You can access a full list of our benefits, programs, support teams and resources within our 'Welcome Packet' as well, which an Apex team member can provide.