Washington, District Of Columbia

Where applicable, confirmation that you meet customer requirements for facility access which may include proof of vaccination and/or attestation and testing, unless an accommodation has been approved.

Secure our Nation, Ignite your Future

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 Senior Security Engineer (ISSE) to join our team in the Washington, DC location.


Manage equipment installation and configuration at each site

•Maintain and update ForeScout Counter ACT configuration as needed including network segments, switch integrations, wireless integrations, Virtual Private Network (VPN) integrations

•Monitor health of Counter ACT Enterprise Managers and Appliances

•Track all internal cases and adhere to change management process as specified by the customer

•Maintain and update configurations of RSA Authentication Manager appliances and/or servers associated identity sources, such as Active Directory as needed and manage RSA hardware and software tokens.

•Interface with engineers and escalation team and Research & Development (R&D) of Fore Scout and RSA for any operational issues and escalations

•Definition and creation of operational and cybersecurity polices in accordance with the customer’s business requirements

•Optimize appliance and server configurations

•Provide recommendations for tool configuration and user training needs

•Conduct continuous monitoring, updating, and reconfiguration to meet customer’s future needs

•Support automated reporting capabilities

•Define standard operations and backup procedures

•Has extensive experience with DoD Security Technical Implementation Guide (STIG) implementation and related documentation

•Able to provide outputs needed to support Risk Management Framework (RMF) such as technical mitigation documents

•Have knowledge in meeting compliance with applicable legislative and executive requirements, policies, and guidelines on Information System Continuous Monitoring (ISCM) for CNIC information technology (IT) assets

•Possess technical experience in mitigating and/or remediating vulnerabilities or misconfigurations, and document findings and severity levels of non-compliance in formalized reporting, written and oral briefs

Education:  Requires Bachelor’s Degree and 7 or more years of relevant experience

Security Clearance Requirements:

  • To hold or obtain a US Government Secret Security Clearance.

Physical Requirements:

Sit, stand, walk and talk

For all positions requiring access to technology/software source code that is subject to export control laws, employment with the company is contingent on either verifying U.S.-person status or obtaining any necessary license. The applicant will be required to answer certain questions for export control purposes, and that information will be reviewed by compliance personnel to ensure compliance with federal law. ManTech may choose not to apply for a license for such individuals whose access to export-controlled technology or software source code may require authorization and may decline to proceed with an applicant on that basis alone.

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.

If you are a qualified individual with a disability or a disabled veteran, you have the right to request an accommodation if you are unable or limited in your ability to use or access http://www.mantech.com/careers/Pages/careers.aspx as a result of your disability. To request an accommodation please click careers@mantech.com and provide your name and contact information.

Washington, District Of Columbia

ManTech was founded in 1968 to provide advanced technological services to the United States government. We began with a single contract with the U.S. Navy to develop war-gaming models for the submarine community. Over the years, our government's technology needs have increased dramatically in scope and sophistication, and we have grown to meet that challenge.


For more than 4 decades, we kept a careful eye on where emerging technologies were taking the government, and we developed the resources to master those technologies—by staying close to our customers and anticipating their needs, hiring talented professionals to propel us into the future, and acquiring companies with proven capabilities.


Today, we are a multi-billion-dollar public company that provides the innovation, adaptability, and critical thinking our government needs for success in defense, intelligence, law enforcement, science, administration, health, and other fields—throughout the nation and in many countries throughout the world. We are now applying the lessons learned in the unforgiving arena of national security to help the private sector protect networks and critical information.

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