Information System Security Engineer

General information

Requisition #

R71956

Locations

USA-VA-Chantilly

Posting Date

11/09/2026

Security Clearance Required

TS/SCI w/ Poly

Remote Type

Onsite

Time Type

Full time

Description & Requirements

Unlock the secrets of intelligence with MANTECH! Join a dynamic team at the forefront of national security, providing advanced solutions to government intelligence agencies. Since 1968, we've been solving the toughest challenges with groundbreaking tech. Explore thrilling projects in Digital Transformation, Cybersecurity, IT, Data Analytics and Software Development. Elevate your career and make a difference. Your adventure begins now-unleash your potential with MANTECH!

MANTECH seeks a motivated, career and customer-oriented Information System Security Engineer ISSE to join our team in Chantilly, VA.

As a Senior Information System Security Engineer ISSE, you will use your technical ISSE and IA experience to provide advice, assistance, and guidance to a government intelligence customer.

Responsibilities include, but are not limited to:

• Perform, or review, technical security assessments of computing environments to identify points of vulnerability, non-compliance with established Information Assurance (IA) standards and regulations, and recommend mitigation strategies.
• Apply knowledge of IA policy, procedures, and workforce structure to design, develop, and implement secure networking, computing, and enclave environments.
• Contribute to the security planning, assessment, risk analysis, risk management, certification and awareness activities for system and networking operations.
• Review certification and accreditation (C&A) documentation, providing feedback on completeness and compliance of its content.
• Support security authorization activities in compliance with Information System Certification and Accreditation Process (ICD 503), the NIST Risk Management Framework (RMF) process, and prescribed ICs business processes for security engineering.
• Assist architects and systems developers in the identification and implementation of appropriate information security functionality to ensure uniform application of government security policy and enterprise solutions.
• Occasional travel, 25% CONUS

Minimum Qualifications:

• Bachelor's Degree and 4 years of relevant experience, or high school diploma/GED and 9 years of relevant experience
• Familiarity with information system security principles.
• Experience with interfacing and briefing military, civilian, and contractor personnel at all levels.
• Knowledge of security-related IC and DoD policies, procedures and operating instructions.
• Experience in applying system security engineering expertise in one or more of the following: system security design process; engineering life cycle; information domain; cross domain solutions; commercial off-the-shelf and government off-the-shelf cryptography; identification, authentication, and authorization; system integration; risk management; intrusion detection; contingency planning; incident handling; configuration control; change management; auditing; certification and accreditation process; principles of IA (confidentiality, integrity, non-repudiation, availability, and access control); and security testing.
• One of the following certifications required Information Assurance Management (IAM) Level I: CAP, GSLC, CISM, CASP, CISSP, CCISCO, Security+.

Preferred Qualifications:

• Experience in supporting the Government in the enforcement of the design and implementation of trusted relationships among external systems and architectures.
• Experience in supporting the building of security architectures and enforcing the design and implementation of trusted relations among external systems and architectures.
• Experience as a primary security engineering representative on engineering teams for the design, development, implementation, evaluation, and/or integration of secure networking, computing, and enclave environments.
• Experience in assessing and mitigating system security threats/risks throughout the program life cycle.
• Experience with Trellix ePolicy Orchestrator
• Experience Tenable Security Center
• Experience with Splunk

Security Clearance Requirement:

• Active/current TS/SCI with Polygraph is required.

Physical Requirements:

• Must be able to be in a stationary position more than 50% of the time
• Must be able to communicate, converse, and exchange information with peers and senior personnel
• Constantly operates a computer and other office equipment

The projected compensation range for this position is $114,600.00-$190,200.00. There are differentiating factors that can impact a final salary/hourly rate, including, but not limited to, Contract Wage Determination, relevant work experience, skills and competencies that align to the specified role, geographic location (For Remote Opportunities), education and certifications as well as Federal Government Contract Labor categories. In addition, MANTECH invests in its employees beyond just compensation. MANTECH's benefits offerings include, dependent upon position, Health Insurance, Life Insurance, Paid Time Off, Holiday Pay, short-term and long-term Disability, Retirement and Savings, Learning and Development opportunities, wellness programs as well as other optional benefit elections.

MANTECH considers all qualified applicants for employment without regard to disability or veteran status or any other status protected under any federal, state, or local law or regulation.

If you need a reasonable accommodation to apply for a position with MANTECH, please email us at careers@mantech.com and provide your name and contact information.