Senior Systems Administrator

General information

Requisition # R65464 Locations USA-MD-Linthicum Heights Posting Date 01/27/2026 Remote Type Onsite Time Type Full time

Description & Requirements

Unlock the secrets of intelligence with MANTECH! Join a dynamic team at the forefront of national security, providing advanced solutions to government intelligence agencies. Since 1968, we’ve been solving the toughest challenges with groundbreaking tech. Explore thrilling projects in Digital Transformation, Cybersecurity, IT, Data Analytics and Software Development. Elevate your career and make a difference. Your adventure begins now—unleash your potential with MANTECH!

MANTECH seeks a motivated, career and customer-oriented Senior Systems Administrator. This position is based in Linthicum Heights, MD.

As a Systems Administrator with a cybersecurity focus, you will play a crucial role in managing and securing systems that support national security. You will be responsible for the installation, configuration, and maintenance of cryptographic hardware and software solutions, ensuring compliance with industry regulations and safeguarding sensitive data for the Department of Defense and the Community.
 

This role supports the Cryptographic Solutions Program, providing essential technical expertise for National Security Systems (NSS) cryptographic products.
 

Responsibilities include but are not limited to:

• Oversee the installation, configuration, and maintenance of cryptographic hardware and software solutions.
• Develop and enforce encryption standards for data at rest and in transit, ensuring compliance with industry regulations.
• Regularly assess the effectiveness of cryptographic measures and perform vulnerability assessments to identify potential weaknesses.
• Work closely with system administrators, network engineers, and cybersecurity analysts to integrate cryptography into existing systems.
• Maintain comprehensive documentation of cryptographic policies, procedures, and system configurations.
   

Minimum Qualifications:

• Bachelor’s degree in technical is required; An additional 5 years of related experience might be substituted for a degree.
• 10+ years of experience in systems administration, systems engineering, or related technical roles with a focus on cryptography or information security.
• Department of Defense (DoD) IAT Level II certification, such as CompTIA Security+ or equivalent. Candidates without this credential must obtain it within 60 days of their start date.
• Familiarity with industry-standard encryption algorithms, such as Advanced Encryption Standard (AES) and Rivest-Shamir-Adleman (RSA), and best practices for secure key generation, distribution, and storage.
• Strong understanding of network protocols and security frameworks (e.g., NIST, ISO 27001).

Preferred Qualifications:

• Experience managing and maintaining server infrastructure across the full SDLC, including Development, Testing, Acceptance, and Production (DTAP) environments.
• Experience configuring and supporting Non-Production (NSYS) systems and implementing automated Deployment Gates (DTAG) to ensure stable releases.
   

Security Clearance Requirements:

• Current/active TS/SCI with Polygraph
   

Physical Requirements:

• 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 -. 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 International Corporation 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 careers@mantech.com and provide your name and contact information.