Systems Administrator, Senior - Military veterans preferred

ManTech (


  full-time   employee

United States

Secure our Nation, Ignite your Future

Become an integral part of a diverse team while working at an Industry Leading Organization, where our employees come first.  At ManTech International Corporation, you’ll help protect our national security while working on innovative projects that offer opportunities for advancement.

Currently, ManTech is seeking a motivated, career and customer-oriented Senior Systems Administrator to join our team in the Hanover location. 

Responsibilities include, but are not limited to:

•    Performs engineering services to analyze network/hardware systems/design/architecture to manage networks of distinct classification levels.
•    This position is the Senior Network Systems Engineer for CNOS labs in our Hanover location.  They will be responsible for maintaining and engineering solutions for networks supporting development systems for all developers.  Must also maintain all lab environments.  Will also work closely with our CNOS labs in other locations.
•    Complete break/fix actions, and provide support to project and STO activities.
•    Provide support to network design/architecture through implementation, maintenance, sustainment of existing networks, and identification/correction of complex network issues.
•    Performs installation, refresh, and modernization of network components and related services, remotely and on site.
•    Implements and sustains Campus Area Networks (CANs), with knowledge of Wide Area Networks (WANs), Data Center Networks/Interfaces (DCN/DCI), Network Security (NETSEC).
•    Conduct network/site surveys, and prepares test reports, if required.
•    Configures (and documents configuration of) computers, networking devices and various peripheral equipment.
•    Analyzes network characteristics (e.g., traffic connect time, transmission speeds, packet sizes, and throughput, latency, capacity, availability), troubleshoots problems, and recommends modification of network configurations.
•    Works tickets supporting the above requirements, within service-level agreement timeframes.
•    Acts as the lead network engineer for Hanover location
•    Deploy, upgrade, or maintain switches/routers/firewalls
•    Set or change VLANs and port security
•    Familiar with Linux operating systems in support of Tacacs+ and Syslog
•    Works with task lead and ISSO to meet project deadlines 
•    Active Directory, DHCP, DNS, and LDAP networking concepts
•    Cabling, racking, and stacking equipment
•    Works with Jira ticketing system

Basic Qualifications:
•    Minimum ten (10) years’ experience in systems administration of hardware and software in support of developing and testing of Information Technology systems 
•    Experience with external network communications
•    Proficiency in working with applicable network devices to include repeaters, bridges, routers, gateways, and hubs

•    Minimum seven (7) years combined experience in administration of Microsoft Windows, Microsoft Windows NT, Unix, and Linux operating systems

•    Minimum seven (7) years’ experience with computer networking protocols including, but not limited to TCP, IP, UDP, HTTP, DHCP, and DNS
•    Minimum five (5) years combined experience supporting Java development activities, including applets, Java Server Pages, and J2EE frameworks such as Hibernate, Spring, Struts or Java Server Faces (JSF)
•    Minimum five (5) years combined experience supporting C and C++ development activities
•    Minimum five (5) years’ experience with integrated processing environments such as a Storage Area Network
•    Minimum two (2) years combined experience supporting HTML, XML, and WEB-based Graphical User Interface/portal development activities
•    Minimum two (2) years’ experience in writing scripts
•    Experience in developing and delivering briefings, technical presentations, and program documentation to senior program management

Preferred Qualifications:
•    CCNA certification
•    Has Cisco IOS and Dell FTOS experience

Security Clearance Requirements:
•    Top Secret clearance with full scope Poly

Physical Requirements:
•    Must be able to lift approximately 80 lbs.
•    Perform sedentary work
•    Must be able to rack and stack equipment
•    Must be able to bend and lift equipment

Our amazing benefits include:
•    Enhanced benefit package- Apply for more information
•    ManTech HSA contribution
•    Up to 25 days PTO plus 10 holidays
•    PTO sellback
•    PTO carryover of up to 240 hours
•    Up to 8% 401k match
•    Up to 4 weeks parental leave
•    Eligibility for annual program bonus
•    Training and conference opportunities and the industry’s leading cyber courses to include the Advanced Cyber Training Program (ACTP)
•    Tuition assistance (selected BS/MS programs are fully paid)
•    Very flexible schedule with compensation or flex hours for extra time worked
•    Employee referral bonuses


For all positions requiring access to technology/software source code that is subject to export control laws, employment with the company is contingent on either verifying U.S.-person status or obtaining any necessary license. The applicant will be required to answer certain questions for export control purposes, and that information will be reviewed by compliance personnel to ensure compliance with federal law. ManTech may choose not to apply for a license for such individuals whose access to export-controlled technology or software source code may require authorization and may decline to proceed with an applicant on that basis alone.

ManTech International Corporation, as well as its subsidiaries proactively fulfills its role as an equal opportunity employer. We do not discriminate against any employee or applicant for employment because of race, color, sex, religion, age, sexual orientation, gender identity and expression, national origin, marital status, physical or mental disability, status as a Disabled Veteran, Recently Separated Veteran, Active Duty Wartime or Campaign Badge Veteran, Armed Forces Services Medal, or any other characteristic protected by law.

If you require a reasonable accommodation to apply for a position with ManTech through its online applicant system, please contact ManTech's Corporate EEO Department at (703) 218-6000. ManTech is an affirmative action/equal opportunity employer - minorities, females, disabled and protected veterans are urged to apply. ManTech's utilization of any external recruitment or job placement agency is predicated upon its full compliance with our equal opportunity/affirmative action policies. ManTech does not accept resumes from unsolicited recruiting firms. We pay no fees for unsolicited services.

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