Senior Cyber Security Engineer

ManTech; Chantilly (NC); On-site; USD 115,000 - 190,000; Full time

Benefits offered by this job

Health Insurance

Life Insurance

Paid Time Off

Holiday Pay

Disability insurance

Retirement and Savings

Job summary

ManTech is seeking a Senior Cyber Security Engineer to join our Chantilly, VA team. You will manage cybersecurity applications, perform system administration, and deliver Tier 2/3 support with focus on vulnerability scanning and automation.

A TS/SCI with poly is required, with potential for AWS/ServiceNow integration experience. The role includes developing policies, maintaining documentation, and ensuring compliance with customer requirements while collaborating with cross-functional teams to

Qualifications

• Bachelor's degree or equivalent experience required.
• 5+ years of cybersecurity tools experience.
• Hands-on with Tenable Nessus and vulnerability scanning.
• Proficient in Windows and Linux administration and network security.
• Experience with security policy compliance is a plus.

Responsibilities

• Provide engineering support and admin for cybersecurity applications; patching and backup.
• Manage scan policies, audit files, scan jobs, reports, dashboards, and content for Nessus and ServiceNow integration.
• Deliver Tier 2/3 maintenance support for cybersecurity technologies and ensure policy compliance.
• Provide customer support via phone, email, or messaging to resolve vulnerability issues.
• Develop automations and scripts to streamline tasks and metrics collection.
• Support A&A activities and update project documentation.
• Analyze feedback to improve processes and efficiency.

Skills

5+ years of experience with cyber

Windows and Linux administration

TCP/IP networking

Cybersecurity monitoring

Requirements-to-system mapping

Communication & customer service

Education

Bachelor's degree or equivalent

IAT Level II certification

Tools

Tenable Nessus

ServiceNow integration

Job description

General information

Requisition #

R70627

Locations

USA-VA-Chantilly

Posting Date

09/09/2026

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 Senior Cyber Security Engineer to join our team in the Chantilly, VA area.

You will support mission-critical infrastructure by managing specialized cybersecurity applications, providing engineering support, and optimizing workflow efficiencies to defend enterprise networks.

Responsibilities include, but are not limited to:

• Perform engineering support and system administration of specialized cybersecurity applications and systems, including installation, configuration, maintenance, patching, and backup/restore.
• Provide expertise in creating, editing, and managing scan policies, audit files, scan jobs, reports, dashboards, and custom content for tools such as Tenable Nessus and ServiceNow integration.
• Deliver Tier 2 and Tier 3 maintenance support for deployed cybersecurity technologies and ensure compliance with customer policies, procedures, and TASKORDs.
• Provide customer support via phone, email, or messaging services to troubleshoot vulnerability scanning issues, maintaining clear communication throughout the resolution process.
• Provide ideas for and integrate automation of repetitive project tasks and metrics collection using scripts, assisting with testing and production implementation.
• Support Assessment and Authorization (A&A) activities related to cybersecurity technologies, updating project documentation and resolving tool implementation conflicts.
• Analyze customer feedback, policies, and workflows to provide recommendations for process improvements and increased project efficiency.

Minimum Qualifications:

• Bachelor’s degree or 4+ years of additional experience in lieu of a degree
• 5+ years of experience working with cybersecurity tools.
• Working knowledge of the Tenable Network Security product suite and enterprise vulnerability scanning operations.
• Solid understanding of Windows and Linux systems administration, operating system security practices, TCP/IP networking, and network security concepts.
• Demonstrated technical knowledge of cybersecurity enterprise scanning, continuous monitoring, enterprise host/network security, and intrusion detection.
• Technical ability to convert functional cybersecurity requirements into system requirements and apply cybersecurity architectural principles (e.g., defense-in-depth, resilience).
• Excellent organizational, planning, communication, and customer service skills with strong attention to detail.
• Active IAT Level II certification, or the ability and willingness to obtain IAT Level II certification within 6 months of hire.

Preferred Qualifications:

• Knowledge of and proficiency in using Amazon Web Services (AWS) technologies and ServiceNow.
• Understanding of federal cybersecurity guidance, including NIST SP 800-37 (Risk Management Framework) and NIST SP 800-137 (Information Security Continuous Monitoring).
• Experience with automation and scripting technology capabilities to streamline repetitive workflow processes.
• Ability to function effectively in a fast-paced environment, managing multiple priorities independently or as part of a collaborative team.

Security Clearance Requirements:

• Must possess an active TS/SCI security clearance with a polygraph.

Physical Requirements:

• Must be able to remain in a stationary position 50% of the time.
• Constantly operates a computer and other office productivity machinery, such as a calculator, copy machine, and computer printer.
• The person in this position frequently communicates with co-workers, management, and customers, which may involve delivering presentations. Must be able to exchange accurate information in these situations.
• Ability to work in a cubicle environment without distractions.

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 [e-mail] and provide your name and contact information.