Patuxent River, Maryland

Where applicable, confirmation that you meet customer requirements for facility access which may include proof of vaccination and/or attestation and testing, unless an accommodation has been approved.

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 Patuxent River, MD. 

Responsibilities include, but are not limited to:

  • Act as a system administrator working with team members to ensure all requirements are delivered in an efficient, highly productive manner

  • Apply best practices where possible or engineer new best practices using innovative approaches as appropriate

  • Analyze new and existing software; install, maintain, and customize vendor software

  • Consult with internal and external users to identify and document user objectives

  • Monitor system and application performance to detect errors; apply testing procedures/methodologies (e.g., diagnostic software) and provide interpretation of data

  • Provide root-cause analysis for recurring or critical problems

  • VMware Administrator provides guidance to ensure all team requirements are successful and workload is efficiently balanced. 

  • Troubleshoot and configure VMware servers to include protocols and switching, best-practice configurations, connectivity and networking concepts.

  • Apply a specific knowledge of VMware systems administration concepts, practices and procedures and is required to be available for on-call mission support. 

  • Work on complex assignments and perform a wide range of VMware system administration activities with little to no direct supervision. 

Basic Qualifications:

  • A 4-year degree in computer science, information technology, or a related field, or equivalent experience

  • 5-7+ years of VMware systems administration experience

  • Experience installing vCenter Server Appliance/Platform Services Controller (PSC) including installation, configuration and updates

  • Knowledge of performance monitoring and tuning tools, problem determination and recovery, and security

Preferred Qualifications:

  • Experience with IBM X-series and Flex System, Dell and HP server technology

  • Experience with VMware performance tuning and capacity planning

  • Experience with high availability architectures and concepts (possibly including, but not limited to HACMP)

  • Experience with Virtual IOS concepts and applications

  • Experience with enterprise backup/restore architectures

  • Experience with Windows Enterprise administration

Security Clearance Requirements:

  • Active DoD TS clearance based upon a SSBI completed within the last 6 years

Physical Requirements:

  • Must be able to remain in a stationary position 50%.

  • Needs to occasionally move about inside the office to access file cabinets, office machinery, etc.

  • delivering presentations. Must be able to exchange accurate information in these situations.

  • May be asked to move Audio/Visual or Computer equipment.

  • Constantly operates a computer and other office productivity machinery, such as a calculator, copy machine and computer printer.

  • Often positions self to maintain computers in the lab, including under the desks and in the server closet.

  • Frequently communicates with co-workers, management and customers, which may involve

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.

If you are a qualified individual with a disability or a disabled veteran, you have the right to request an accommodation if you are unable or limited in your ability to use or access as a result of your disability. To request an accommodation please click and provide your name and contact information.

Patuxent River, Maryland

ManTech was founded in 1968 to provide advanced technological services to the United States government. We began with a single contract with the U.S. Navy to develop war-gaming models for the submarine community. Over the years, our government's technology needs have increased dramatically in scope and sophistication, and we have grown to meet that challenge.


For more than 4 decades, we kept a careful eye on where emerging technologies were taking the government, and we developed the resources to master those technologies—by staying close to our customers and anticipating their needs, hiring talented professionals to propel us into the future, and acquiring companies with proven capabilities.


Today, we are a multi-billion-dollar public company that provides the innovation, adaptability, and critical thinking our government needs for success in defense, intelligence, law enforcement, science, administration, health, and other fields—throughout the nation and in many countries throughout the world. We are now applying the lessons learned in the unforgiving arena of national security to help the private sector protect networks and critical information.

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