System Administrator (2026-0251) with Security Clearance

Acclaim Technical Services, founded in 2000, is a leading cyber operations, intelligence solutions and operations, network infrastructure, engineering and business enablement and enterprise operations company supporting a wide range of U.S. Federal agencies. We are an Employee Stock Ownership Plan (ESOP) company, which is uncommon within our business sector. We see this as a significant strength, and it shows: ATS is consistently ranked as a top workplace among DC area firms and continues to grow. ATS is seeking System Administratorto support a client's operational requirements in a challenging, dynamic setting located in the Washington Metropolitan Area. The positions require an active TS/SCI with Polygraph security clearance. What you'll be doing End-user and account support

• Serve as the customer support IT point of contact: set up user accounts, reset passwords, and resolve day-to-day IT issues.
• Apply system and security patches and run security and compliance scans.
• Support day-to-day customer needs, including technical exchange meetings (TEMs) and digitizing material such as scanning hardcopy documents. Data transfers
• Act as the primary point of contact for moving data on and off customer systems and networks, including standalone machines and laptops. Hardware and standalone systems
• Assist with hardware recapitalization (tech refresh), setup, and replacement at the customer site, including monitors, workstations, and network switches.
• Provide operations and maintenance (O&M) for standalone machines and laptops, including patching, required scans, and setup. Network and system troubleshooting
• Provide first-line support for network and system troubleshooting.
• Act as the on-site point of contact coordinating customer and team responses during troubleshooting, outages, and upgrades.
• Use approved notification systems (ticketing, email, etc.) to notify the customer and team about systems in or related to the supported programs.
• Write incident reports and follow up during and after incidents, events, and responses. Reporting and coordination
• Coordinate any tasking outside this scope of work with Customer.
• Perform additional IT support tasks as required. Required skills These are inferred from the scope of work; adjust years and clearance to match the contract.
• 3+ years of hands-on IT help desk, desktop support, or systems administration experience.
• Experience creating and managing user accounts and resetting passwords (e.g., Active Directory).
• Experience applying OS and security patches on Windows workstations and laptops.
• Experience running security and compliance scans and remediating findings.
• Experience installing, configuring, and replacing workstations, monitors, and network switches.
• Working knowledge of network troubleshooting (TCP/IP, DNS, DHCP, switching).
• Experience using a ticketing system to log, track, and communicate issues.
• Strong written communication for weekly status reports and incident reports.
• Ability to work on site during 0700-1600 Monday through Friday and to provide on-call support.
• Ability to lift and move IT equipment such as workstations and monitors. Desired skills
• CompTIA Security+ or equivalent DoD 8140/8570 IAT Level II certification.
• CompTIA A+ and/or Network+.
• Experience supporting government or defense customers, including classified or isolated networks.
• Familiarity with secure data transfer procedures between networks and standalone systems.
• Experience with compliance and vulnerability scanning tools such as ACAS/Nessus or SCAP/STIG Viewer.
• Experience with patch management tools such as WSUS, SCCM/MECM, or Intune.
• Experience with hardware tech refresh projects and asset inventory.
• Experience operating scanners and document digitization workflows.
• Experience supporting meetings and A/V setup for technical exchange meetings.
• Comfort working as a subcontractor alongside a prime contractor and the end customer.
• Active security clearance, if required by the contract.