Altadena, California

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 System Administrator to join our team in the Altadena, CA office.

Responsibilities include, but are not limited to:

  • Provide support for desktop Windows, Linux and macOS operating systems (OS), physical and virtual, Symantec Suite of cybersecurity products, Microsoft Office Suite including Visio, Project.

  • Provide support for enterprise programs and applications to include VMWare, RedHat Linux, CentOS Linux, Windows Server, Citrix, LDAP, Apache HTTP Server, Apache Tomcat, and various scripting languages including Perl, Python, Java, Bash, PowerShell, VB Script.

  • Maintain LDAP and associated custom scripting for account validation and configuration management software (i.e. Ansible, Puppet)

  • Assign privileges, maintain, and troubleshoot systems and software problems

  • Interface with site Help Desk and trouble reporting system

  • Perform functions such as hard drive removal, print server configuration, performance optimization, support printers, and storage peripherals

  • Investigate vendor vulnerability updates and patches and create/modify scripting to assure system configuration compatibilities

  • Rapidly distinguish isolated user problems from enterprise-wide application/system problems.

  • Coordinate with customers and stakeholders to collect data, conduct analysis, develop, and implement solutions associated with incident tickets and requirements.

  • Develop solutions to complex technical issues

  • Provide follow-up reports (technical findings, feedback, resolution steps taken) for Root Cause analysis, engineering technical assessment and process improvement initiatives

  • Support customer requirements Monday – Friday/2 work-shift environment and be able to provide on-call support during outages occurring after hours.

Basic Qualifications:

  • Experience with Tier 2 system administration of server operating systems such as Linux (CentOS, RHEL, or Ubuntu) and Microsoft Server (2012 R2/2016).

  • Experience maintaining/administering/updating operating systems, products, applications, and services.

  • Experience interacting with customers to handle service inquiries and problems.

  • Experience supporting the implementation, troubleshooting and maintenance of IT systems.

  • Familiarity with supporting virtual desktops running Linux and/or Microsoft Windows.

  • Experience with Scripting/Automation through Linux Shell scripts, PowerShell, PowerCLI, or other scripting languages.

  • Experience troubleshooting issues in a growing environment.

  • Experience with log reviews, incident analysis, and identification of issue trends.

  • Experience with server patch management methodologies.

  • Time management skills with the ability to work within an IT Service Management/ticketing system (i.e. ServiceNow) independently.

  • Ability to triage and properly classify incidents and prioritize work efforts accordingly.

  • Strong oral and written communications skills.

  • Track record of working effectively within a team, and support to peers toward improved processes and results.

  • Candidate must, at a minimum, meet DoD 8570.11- IAT Level II certification requirements (currently Security+ CE, CCNA-Security, GSEC, or SSCP)

  • The candidate must have Bachelor’s Degree with 5-7 years (4 years of additional experience may be substituted in lieu of a bachelor's degree) or a Master’s Degree with less than 2 years of prior relevant experience. (5 years of additional experience may be substituted in lieu of a master's degree)

Preferred Qualifications:

  • Certification relating to VMware (VCA/VCP), Linux Administration (RHCSA, RHCE, RHCA, Linux+), or Linux Security (GCUX) a plus.


Security Clearance Requirements:

  • US Citizenship is required.

  • An active TS/SCI with CI polygraph is required for this position.

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.

Altadena, California

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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