Security Engineer

General information

Requisition # R61280 Locations USA-VA-Herndon Posting Date 06/18/2025 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 Security Engineer to join our team in Herndon, VA. 

We are seeking a highly skilled Security Engineer to design, implement, and maintain secure environments that align with compliance standards in support of a high priority mission at one of our National Intelligence Customers.  This role requires an individual with a strong technical foundation in cybersecurity, a deep understanding of federal security frameworks, and a proactive approach to protecting mission-critical systems.

Responsibilities include but are not limited to:

• Implement and maintain cybersecurity solutions across classified and unclassified environments.

• Perform risk assessments, vulnerability scans, and system hardening in compliance with NIST 800-53 and RMF.

• Support the preparation and submission of security documentation for Authority to Develop (ATD) and Authority to Operate (ATO) under IC guidelines.

• Collaborate with system owners, ISSOs, ISSEs, ISSMs, engineers, and auditors during security assessments and continuous monitoring.

• Monitor and respond to security incidents, performing root cause analysis and remediation.

• Integrate security controls into DevSecOps pipelines and cloud architectures (AWS, Azure, GCP or Oracle).

• Support development and implementation of security policies, plans, and SOPs.

• Stay current on evolving federal cybersecurity directives, threats, and compliance requirements

Minimum Qualifications:

• Bachelor’s degree in Cybersecurity, Computer Science, Information Systems, or 4+ years of equivalent experience in a related field

• 7+ years of experience in cybersecurity or related IT security roles.

• Experience with NIST Risk Management Framework (RMF), FedRAMP, or DoD Cybersecurity Maturity Model Certification (CMMC).

• Hands-on experience working in air-gapped cloud environments.

• Knowledge of system/network security principles and incident response practices.

• Experience supporting the Intelligence Community.

Preferred Qualifications:

• DoD 8570.01-M IAT Level II or III certification (e.g., Security+, CISSP, CEH, CISM).

• Knowledge of STIGs, SCAP tools, and secure system baselining.

• Hands-on experience with security tools (e.g., ACAS, Splunk, Tenable, Palo Alto, CrowdStrike, or similar).

• Scripting or automation experience (Python, Bash, PowerShell) to support security operations.

Clearance Requirements:

• Must hold an active TS/SCI with Polygraph

Physical Requirements:

• Must be able to remain in a stationary position 50% of the time.

• Needs to occasionally move about inside the office to access file cabinets, office
  machinery, etc.

• Frequently communicates with co-workers, management, and customers, which may
  involve delivering presentations. Must be able to exchange accurate information in
  these situations.

ManTech International Corporation 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.