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Proactive - ISSO/ISSE

Apex Systems

Company : Apex Systems

Location : Dahlgren, VA

Posted Date : 14 October 2025

Job Details

ISSO Position

Apex Systems is seeking an ISSO to support the US Navy in Dahlgren, VA.

Position: ISSO

Location: Dahlgren, VA 4x a week onsite, 1x telework

Hours: Regular business hours

Compensation: $120,000-140,000/yr depending on experience

Job type: 6-month contract to hire

Clearance: Candidates must be US citizens able to obtain and/or maintain a DoD Top Secret clearance as a condition of employment

Certifications: Must have CASP or CISSP

Responsibilities

Key Responsibilities:

  • Conducting vulnerability scans and recognizing vulnerabilities in security systems.
  • Using DoD network analysis tools to identify vulnerabilities (e.g., ACAS, HBSS, etc.).
  • Conducting application vulnerability assessments.
  • Identifying systemic security issues based on the analysis of vulnerability and configuration data.
  • Sharing meaningful insights about the context of an organization's threat environment that improve its risk management posture.
  • Applying cybersecurity and privacy principles to organizational requirements (relevant to confidentiality, integrity, availability, authentication, non-repudiation).
  • Troubleshooting and diagnosing cyber defense infrastructure anomalies and working through resolution.
  • Performing impact/risk assessments.

Required Skills

  • Skill in conducting vulnerability scans and recognizing vulnerabilities in security systems.
  • Skill in using DoD network analysis tools to identify vulnerabilities (e.g., ACAS, HBSS, etc.).
  • Skill in system, network, and OS hardening techniques (e.g., remove unnecessary services, password policies, network segmentation, enable logging, least privilege, etc.).
  • Skill in conducting application vulnerability assessments.
  • Ability to identify systemic security issues based on the analysis of vulnerability and configuration data.
  • Ability to share meaningful insights about the context of an organization's threat environment that improve its risk management posture.
  • Ability to apply cybersecurity and privacy principles to organizational requirements (relevant to confidentiality, integrity, availability, authentication, non-repudiation).
  • Tenable Assured Compliance Assessment Solution (ACAS)
  • Trellix Endpoint Security System (ESS), previously known as McAfee Host Based Security System (HBSS)
  • Skill in applying host/network access controls (e.g., access control list).
  • Skill in using Virtual Private Network (VPN) devices and encryption.
  • Skill in securing network communications.
  • Skill in protecting a network against malware. (e.g., NIPS, anti-malware, restrict/prevent external devices, spam filters).
  • Skill in troubleshooting and diagnosing cyber defense infrastructure anomalies and work through resolution.
  • Skill in performing impact/risk assessments.
  • Skill to develop insights about the context of an organization's threat environment
  • Skill to apply cybersecurity and privacy principles to organizational requirements (relevant to confidentiality, integrity, availability, authentication, non-repudiation).

Qualifications

Required:

  • Knowledge of computer networking concepts and protocols, and network security methodologies.
  • Knowledge of network security architecture concepts including topology, protocols, components, and principles (e.g., application of defense-in-depth & concept of zero trust).
  • Knowledge of basic system, network, and OS hardening techniques.
  • Knowledge of Intrusion Detection System (IDS)/Intrusion Prevention System (IPS) tools and applications.
  • Knowledge of network protocols such as TCP/IP, Dynamic Host Configuration, Domain Name System (DNS), and directory services.
  • Knowledge of application vulnerabilities.
  • Knowledge of system administration, network, and operating system hardening techniques.
  • Knowledge of system administration concepts for operating systems such as but not limited to Unix/Linux, IOS, Android, and Windows operating systems.

Preferred:

  • Knowledge of cyber threats and vulnerabilities.
  • Knowledge of specific operational impacts of cybersecurity lapses.
  • Knowledge of host/network access control mechanisms (e.g., access control list, capabilities list).
  • Knowledge of cybersecurity and privacy principles and organizational requirements (relevant to confidentiality, integrity, availability, authentication, non-repudiation).
  • Knowledge of network traffic analysis methods.
  • Knowledge of Virtual Private Network (VPN) security.
  • Knowledge of transmission records (e.g., Bluetooth, Radio Frequency Identification (RFID), Infrared Networking (IR), Wireless Fidelity (Wi-Fi). paging, cellular, satellite dishes, Voice over Internet Protocol (VoIP)), and jamming techniques that enable transmission of undesirable information, or prevent installed systems from operating correctly.
  • Knowledge of network access, identity, and access management (e.g., public key infrastructure, Oauth, OpenID, SAML, SPML).
  • Knowledge of system and application security threats and vulnerabilities (e.g., buffer overflow, mobile code, cross-site scripting, Procedural Language/Structured Query Language [PL/SQL] and injections, race conditions, covert channel, replay, return-oriented attacks, malicious code).
  • Knowledge of different classes of attacks (e.g., passive, active, insider, close-in, distribution attacks).
  • Knowledge of application security risks.

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 employeeservices@apexsystems.com or 844-463-6178.

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 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.

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