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# Senior Systems Engineer

- **Company:** Mantech International Corporation
- **Location:** Quantico, VA, United States
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Apple IOS, Systems Engineering, VoIP, CompTIA Security+, Cyber Security, System Configuration, Dynamic Host Configuration Protocol, Domain Name System (DNS), Network Security, Microsoft Software, Routing, Network Protocols, NIPRNet, Red Hat Enterprise Linux, SAP (Applications), Systems Integration, TCP/IP, Network Switches, Network Routers, Nx-os, Firewalls (Computer Science), Information Technology, Network Server, Cisco
- **Published:** November 14, 2026
- **Apply:** https://www.clearancejobs.com/jobs/9313425/senior-systems-engineer

## About the Role

MANTECH seeks a motivated, career and customer-oriented Senior Systems Engineer to join our team in Quantico, VA., * BA/BS in a relevant technical field AND nine (9) or more years of experience in systems engineering, systems administration or network engineering.

 + OR high school diploma and thirteen (13) or more years of relevant experience.
 * Deep understanding of systems integration, networking protocols (TCP/IP, DNS, DHCP), routing, and comprehensive network security principles.
 * Expertise in configuring and managing enterprise devices (routers, switches, firewalls) with hands-on experience in Cisco technologies (e.g., IOS, NX-OS) and security appliances (e.g., ASA firewalls, ISE).
 * Proven experience securing classified networks (SIPR, NIPR, JWICS) and implementing DISA STIGs; strong familiarity with NIST frameworks and RMF.
 * Must hold an active DoD 8570.01-M IAT Level II certification at minimum.

Desired Qualifications:

 * Master's degree in Computer Science, IT, Systems Engineering, or a relevant discipline.
 * Experience implementing multi-vendor VoIP and VTC products in RMF environments.
 * Experience with scripting/automation tools for system management; familiarity with the ITIL framework (ITIL Foundation certificate desired).
 * Relevant high-level networking or systems certifications (e.g., Cisco CCNP, CCIE, CompTIA Security+, Microsoft, or Red Hat).
 * Prior experience supporting a USMC enterprise program, or experience at a DoD Combatant Command (e.g., INDOPACOM, CENTCOM, CYBERCOM).

Clearance Requirements:

 * Must have a current/active TS/SCI clearance
 * Must be eligible to obtain Special Access Program (SAP)

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.
 * This position requires travel up to 10%

## Description

* Coordinates the procurement, shipping, installation, configuration, and integration of multi-network systems for a global USMC program, driving a seamless "DISA-to-Desktop" architecture.
 * Plans and designs the connectivity of enterprise system and network assets, ensuring compliance and secure operations across classified networks and domains.
 * Ensures all systems, servers, network switches, and routers are installed, properly configured, and strictly compliant with DISA STIG requirements.
 * Supports the planning and implementation of enterprise service connections across domains, facilitating secure cloud computing architecture (SCCA), cross-domain solutions, and guards.
 * Collaborates with ISSOs and Cybersecurity Services Leads in the Risk Management Framework (RMF) process.
 * Creates diagrams and documentation to facilitate SCI and SAP accreditations.