ManTech delivers technology-driven innovation, develops game-changing solutions, and delivers mission-focused technologies for defense and federal civilian agencies.

Defense & Space
1968

Actively Hiring

AI Summary

MANTECH is seeking a senior Network Engineer to support Department of Defense mission systems in Philadelphia, PA (hybrid). The role involves managing third-party cybersecurity tools, conducting shipboard installations and testing, and producing data-driven metrics. Candidates need a bachelor's degree with 12+ years of experience, an active Secret clearance, and a DoD IAT Level II certification. This position offers an opportunity to work on cutting-edge defense projects and requires expertise in OT network protection, SIEM platforms, and vulnerability management.

Role DNA

Job Complexity

Easy Hard

Pace & Pressure

Relaxed Fast-paced

Autonomy Level

Guided Full Ownership

Communication Load

Independent Highly Collaborative

AI Insight The role demands extensive experience, advanced certifications (e.g., Security+ CE), and a security clearance, reflecting a high level of technical and professional maturity.

Salary Analysis

AI Insight The offered salary range of $116,400-$194,900 is competitive for a senior cleared Network Engineer, aligning with market rates for roles requiring a Secret clearance and deep technical expertise. The median of $155,650 is attractive for candidates with 12+ years of experience.

Key Skills

Network Engineering Cybersecurity TCP/IP Networking SIEM Platforms Vulnerability Assessment Firewall Design OT Networks Security Clearance Stakeholder Communication Python/PowerShell

Cover Letter Sample

Dear Hiring Manager,

I am writing to express my strong interest in the Network Engineer position at MANTECH. With over 12 years of experience in network engineering and a proven track record of supporting DoD mission systems, I am confident in my ability to contribute to your team. My expertise includes OT network enumeration, third-party tool integration, and shipboard installations, aligning perfectly with the responsibilities outlined.

I hold an active Secret clearance and a DoD IAT Level II certification (Security+ CE), and I have hands-on experience with SIEM platforms, vulnerability assessments, and stakeholder communication. I am skilled in producing data-driven metrics and briefing technical and non-technical audiences. The opportunity to work on cutting-edge defense projects at MANTECH excites me, and I am eager to bring my technical leadership to your team.

Thank you for considering my application. I look forward to the possibility of discussing how I can support MANTECH’s mission to safeguard our nation.

Sincerely,
[Your Name]

Possible Interview Questions

Describe your experience with OT network enumeration and protection. How have you used passive network discovery tools in past roles?

In my previous role, I used tools like Wireshark and Zeek to perform passive network discovery in OT environments. I created asset inventories and identified potential vulnerabilities. For example, I led a project to map a SCADA network, which helped prioritize patching and segmentation strategies.

How do you approach the integration of third-party cybersecurity tools into existing infrastructure?

I start by understanding the tool’s capabilities and the current environment through vendor coordination and acceptance testing. I ensure compatibility with existing SIEMs and firewalls, and conduct pilot deployments before full-scale rollout. Documentation and training are key for smooth integration.

Can you walk us through a time you produced data-driven metrics for leadership? What was the impact?

I developed a dashboard using Python and Power BI to track vulnerability remediation timelines. The metrics revealed bottlenecks in patch deployment, enabling us to streamline processes and reduce average remediation time by 30%. This improved our security posture and compliance reporting.

What challenges have you faced with shipboard installations, and how did you overcome them?

Shipboard installations often involve space constraints and operational schedules. I coordinated closely with shipyard and Navy personnel to plan installations during maintenance windows. I also conducted pre-installation site surveys to anticipate issues, ensuring minimal disruption to ship operations.

How do you stay current with cybersecurity threats and DoD policies? Give an example of applying new knowledge.

I subscribe to CISA alerts and attend industry conferences. Recently, I applied NIST SP 800-82 updates to enhance our OT security framework. I also led a team training on IEC 62443 standards, which improved our incident response procedures.

General information

Requisition #

R68544

Locations

USA-Remote Work, USA-PA-Philadelphia

Posting Date

06/10/2026

Security Clearance Required

Secret

Remote Type

Hybrid

Time Type

Full time

Description & Requirements

Shape the future of defense with MANTECH! Join a team dedicated to safeguarding our nation through advanced tech and innovative solutions. Since 1968, we’ve been a trusted partner to the Department of Defense, delivering cutting-edge projects that make a real impact. Dive into exciting opportunities in Cybersecurity, IT, Data Analytics and more. Propel your career forward and be part of something extraordinary. Your journey starts now—protect and innovate with MANTECH!

MANTECH seeks a motivated, career and customer-oriented Network Engineer to join our team in Philadelphia, PA. This position is hybrid with 3 days onsite.

The Network Engineer will support Department of Defense (DoD) mission systems. This role leads the technical management of third party developed cybersecurity tools, coordinates shipboard installation and testing activities, and produces data-driven metrics that inform engineering priorities and leadership decisions.

Responsibilities include but are not limited to:

OT Network Enumeration & Protection including passive network discovery, asset inventory management, threat detection & monitoring, and vulnerability management
Third-Party tool management to include vendor coordination, tool integration, and acceptance testing
Shipboard Installation & Testing which includes installation planning, site surveys & commissioning, and operational validation
Metrics, Reporting & Stakeholder Communication requiring weekly & monthly metrics, data-driven recommendations, cross-team collaboration and documentation
Produce clear written reports and brief technical and non-technical stakeholders, including government leadership

Minimum Qualifications:

Bachelor’s degree with 12+ years of experience in network engineering, or an Associate’s degree with 14+ years of relevant experience, or a High School diploma with 16 years of experience
An active and current DoD IAT Level II baseline certification (e.g., Security+ CE), or the ability to obtain one within 6 months of hire
Working knowledge of TCP/IP networking, packet capture and analysis (Wireshark/Zeek), SIEM platforms, firewall and segmentation design, and common vulnerability assessment workflows

Preferred Qualifications:

Master’s and 10+ years of experience, or PhD and 8+ years of experience highly desired
Project Management Professional (PMP), or Cisco Certified Network Associate (CCNA)Additional value for GICSP, GRID, CISSP, or equivalent OT/ICS-focused credentials
Hands-on work with industrial control systems, SCADA, or shipboard control systems; familiarity with OT protocols such as Modbus, DNP3, IEC 61850, or Ethernet/IP
Experience with passive OT monitoring platforms (e.g., Claroty, Dragos, Nozomi Networks, or equivalent) and integration with enterprise SIEMs
Experience supporting Navy shipboard, afloat, or deployed environments, including availabilities, sea trials, or underway testing
Familiarity with NIST SP 800-82, IEC 62443, RMF (NIST SP 800-37), and DoD cybersecurity policy
Proficiency in Python, PowerShell, or Bash for data processing, metrics generation, and light tool development

Clearance Requirements:

Must have a current and active Secret security clearance with ability to obtain a Top Secret clearance.

Physical Requirements:

The person in this position must be able to remain in a stationary position 50% of the time. Occasionally move about inside the office to access file cabinets, office machinery, or to communicate with co-workers, management, and customers, via email, phone, and or virtual communication, which may involve delivering presentations.

The projected compensation range for this position is $116,400.00-$194,900.00. 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 [email protected] and provide your name and contact information.

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