Principal Information System Security Engineer (ISSE) - Military veterans preferred

ManTech (


  full-time   employee

United States

Secure our Nation, Ignite your Future

Job Requisition Template:

Become an integral part of a diverse team while working at an Industry Leading Organization, where our employees come first.  At ManTech International Corporation, you’ll help protect our national security while working on innovative projects that offer opportunities for advancement.

Currently, ManTech is seeking a motivated, career and customer-oriented Principal Information System Security Engineer (ISSE) to join our team. This position will directly support the Innovation & Capability Office, which is a centralized, cohesive organization focused on building new and enhancing existing capabilities to enhance our competitive strategy.  

Responsibilities include, but are not limited to:

The Principal Information System Security Engineer (ISSE) ensures that cyber security requirements are effectively integrated into information systems through purposeful security architecting, design, development, and configuration. Must possess excellent analytical skills and be capable of quantifying risk to enterprise systems and level of compliance with security policy. The ISSE employs best practices to integrate security into all facets of business operations. Requires expert technical knowledge in security engineering and IT systems engineering.

  • Provides systems engineering and technical security designs that meet both mission functional requirements and RMF Rev 4 security policy requirements
  • Provides expert level consultation and technical services on all aspects of information security, including architecture, system engineering, application design, and management and operational controls
  • Translates security requirements into specific technical actions for system engineers
  • Conducts certification testing and reporting in accordance with the Risk Management Framework (RMF), and NIST 800-53 Rev 4; identifies POA&M deficiencies and provides solution recommendations
  • Implements technical and operational components of the continuous monitoring strategy, including endpoint management, vulnerability management, boundary protection, credential and authentication management, audit compliance, and secure governance
  • Performs systems administration, application configuration, dashboard development for a Splunk or ELK in a distributed Red Hat Linux environment
  • Maintains front-end and back-end Tenable Security Center/Nessus vulnerability management architecture on a Red Hat Linux platform
  • Provides written security impact assessment of all proposed network and IT system engineering changes as part of the enterprise change management process
  • Creates and maintains existing information system security documentation, including SSP, Security Controls Trace Matrix, and Security Configuration Guide
  • Provides audit and cybersecurity support for enterprise SOC and virtual security exercises involving enterprise IT assets and users

Basic Qualifications:

  • BA/BS degree and a minimum of 10+ years of related cybersecurity or system engineering experience
  • CISSP or DoD 8570.1 certification IAT Level III
  • Minimum 3 years of experience with certification testing using Risk Management Framework (RMF), information assurance tools, and DoD STIG / SRG
  • Expertise configuring a wide variety of operating systems including Windows 7/10, Windows Server 2008 R2/2012+, and Red Hat Enterprise Linux 6/7
  • Strong IT system and application engineering background with experience in Active Directory Group Policy Objects (GPO), SQL databases, networking, IDS, VMware ESX/NSX, Docker/Kubernetes, Splunk or ELK, endpoint management suite, Tenable Security Center, PowerShell or Python, Bash scripting, and Syslog
  • Excellent verbal and written communication ability

Preferred Qualifications:

  • Experience with Cypherpath, Git, RMF, Ansible

Security Clearance Requirements:

  • US Citizenship is required

Physical Requirements:

  • Stationary; able to use computer assets and sit for extended periods of time

ManTech International Corporation, as well as its subsidiaries proactively fulfills its role as an equal opportunity employer. We do not discriminate against any employee or applicant for employment because of race, color, sex, religion, age, sexual orientation, gender identity and expression, national origin, marital status, physical or mental disability, status as a Disabled Veteran, Recently Separated Veteran, Active Duty Wartime or Campaign Badge Veteran, Armed Forces Services Medal, or any other characteristic protected by law.

If you require a reasonable accommodation to apply for a position with ManTech through its online applicant system, please contact ManTech's Corporate EEO Department at (703) 218-6000. ManTech is an affirmative action/equal opportunity employer - minorities, females, disabled and protected veterans are urged to apply. ManTech's utilization of any external recruitment or job placement agency is predicated upon its full compliance with our equal opportunity/affirmative action policies. ManTech does not accept resumes from unsolicited recruiting firms. We pay no fees for unsolicited services.

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