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Sr. System Administrator

Job in Arlington, Arlington County, Virginia, 22201, USA
Listing for: Modern Technology Solutions, Inc.
Full Time position
Listed on 2026-02-16
Job specializations:
  • Engineering
    Cybersecurity, Systems Engineer
  • IT/Tech
    Cybersecurity, Systems Engineer
Salary/Wage Range or Industry Benchmark: 60000 - 80000 USD Yearly USD 60000.00 80000.00 YEAR
Job Description & How to Apply Below

As the System Administrator you will be responsible for the installation, operation and maintenance of system and networking technologies. This position will be located in the Washington, DC area.

Other Duties Include
  • Performing systems administrator functions on Windows servers and workstations.
  • Configuring and maintaining routers, switches and other networking equipment.
  • Servicing more than 400 local and remote network users of multi-level classified systems.
  • Working with an IT and IA team to establish overall priorities and respond to the daily and unique requests from team members, users and program support personnel.
  • Maintaining a professional and courteous relationship with all team members is absolutely critical as is an earnest desire to find and detect problems and then work with the IT and IA team to develop and implement a solution.
Requirements
  • 10 years experience working experience with DoD networks.
  • 5 years of relevant experience working in a Special Access Program environment.
  • Must have a strong working knowledge of:
  • Windows 10/11 desktop operating systems
  • Windows and Exchange Server (2016/2019) in both physical and virtualized environments
  • Must have a DoD IAT Level II - DoD 8140 (Formally 8570) certifications (i.e., Security+).
  • Must have experience with configuring Windows Active Directory and Group Policies.
  • Have a robust familiarization with the DISA Security Technical Implementation Guidelines (STIG) that deal with maintaining the network security posture and be able to communicate to leadership with recommendations/guidance to growing and improving the network design.
  • Experience with planning, implementing, administering, and securing network infrastructure including network security appliances, routers, managed switches, servers, workstations, peripherals, cabling, and other equipment.
  • Experience with TCP/IP protocols and advanced IT networking concepts required.

    Working knowledge of several of the following technologies:
    Microsoft Windows, Linux, Cisco IOS, VMware, MECM (SCCM), DNS, Disk SAN, security assessment tools and network hardware and media (blade-servers, fiber channel, and network cabling).
  • Experience implementing, upgrading, and administering Windows servers, including SQL Server.
  • Good communications and people skills, both oral and written, is an absolute must.
  • Must be able to interact and communicate effectively with individuals of different experience levels and backgrounds including government and external industry personnel.
Education Requirements
  • Bachelor's degree in a related field.
  • 12+ years of experience is accepted in lieu of a degree.
Clearance Requirement
  • Must have a current TS/SCI clearance and be eligible for special program access.
Interesting Work

Our co-workers support some of the most important and critical programs to our national defense and security.

Values

Our first core value is that employees come first. We challenge our co-workers to provide the highest level of support and service, and reward them with some of the best benefits in the industry.

100% Employee Owned

We have a stake in each other's success, and the success of our customers. It's also nice to know what's going on across the company; we have company wide town-hall meetings three times a year.

Great Benefits - Most Full-Time Staff Are Eligible For
  • Starting PTO accrual of 20 days PTO/year + 10 holidays/year
  • Flexible schedules
  • 6% 401k match with immediate vesting up to $9k annually
  • Semi-annual bonus eligibility (July and December)
  • Company funded Employee Stock Ownership Plan (ESOP) - a separate qualified retirement account
  • Up to $10,000 in annual educational reimbursement
  • Other company funded benefits, like life and disability insurance
  • Optional zero deductible Blue Cross/Blue Shield health insurance plan
Track Record of Success

We have grown every year since our founding in 1993.

Company Overview

Modern Technology Solutions, Inc. (MTSI) is a 100% employee-owned engineering services and solutions company that provides high-demand technical expertise in Digital Transformation, Modeling and Simulation, Rapid Capability Development, Test and Evaluation, Artificial Intelligence, Autonomy, Cybersecurity and Mission Assurance.

MTSI delivers capabilities to solve problems of global importance. Founded in 1993, MTSI today has employees at over 20 offices and field sites worldwide.

More Information

For more information about MTSI, please visit

Equal Employment Opportunity Statement

MTSI embraces nine core values including our first core value of Employees come first. Consistent with our Core Values, we are committed to Equal Opportunity, making decisions without regard to race, color, religion, sex, national origin, age, military/veteran status, disability, or any other characteristics protected by applicable law. MTSI is committed to Equal Employment Opportunity and providing reasonable accommodations to applicants and employees with physical and/or mental disabilities.

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