Job Description

ManTech seeks a motivated, career and customer-oriented Security Engineer to join our team in Herndon, VA.

We are searching for 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 additional 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 have active TS/SCI with Full Scope 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.

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