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# Systems Administrator - Advanced 1 (Senior)

- **Company:** The Johns Hopkins University Applied Physics Laboratory LLC
- **Location:** North Laurel, MD, United States
- **Experience:** Expert
- **Salary:** $100,000.0 - $245,000.0
- **Contract:** Permanent contract
- **Skills:** Microsoft Windows, Active Directory, User Authentication, Cloud Computing, Cyber Security, Dynamic Host Configuration Protocol, Linux, Domain Name System (DNS), Monitoring of Systems, Hyper-V, Virtual Private Networks (VPN), Python (Programming Language), Linux System Administration, Windows Servers, NetApp Applications, Network Connections, Package Management Systems, Performance Tuning, Windows PowerShell, Red Hat Enterprise Linux, Ansible, Virtual Local Area Networks, Virtualization Technology, Scripting, Load Balancing, High Performance Computing, Information Technology, Data Management, Vmware
- **Published:** November 5, 2026
- **Apply:** https://diversityjobs.com/career/18844745/Systems-Administrator-Advanced-1-Senior-Maryland-Laurel

## About the Role

Are you a systems administrator who enjoys solving complex problems, improving how systems operate, and helping teammates grow?

Do you bring strong Linux expertise and an interest in working across virtualization, storage, networking, Windows, automation, and cybersecurity?

Ranked among Computerworld 's Top Places to Work in IT for 8 consecutive years, APL opens the door for you to make a difference!

We are seeking a collaborative Senior Systems Administrator to support mission-critical systems in highly classified environments. This hands-on role combines Linux depth with broad infrastructure responsibility. You will resolve complex issues, lead technical improvements, mentor other administrators, and help deliver secure, reliable services.

You do not need to be an expert in every technology listed. We value strong fundamentals, practical judgment, curiosity, collaboration, and the ability to learn., * Have a bachelor's degree in information technology, computer science, cybersecurity, or a related field, or 10+ years equivalent practical experience.

 * 8+ years of progressively responsible systems administration experience, including substantial production Linux administration.
 * Broad experience in at least three adjacent areas, such as Windows administration, virtualization, enterprise storage, networking, automation, HPC, cloud, or cybersecurity.
 * Experience troubleshooting complex infrastructure issues and implementing sustainable corrective actions.
 * Experience supporting classified, regulated, or other security-controlled environments.
 * Ability to communicate technical information clearly and work effectively across technical, security, and program teams.
 * An active Top Secret clearance and the ability to obtain SCI access. U.S. citizenship is required.
 * An IAT Level II certification, such as Security+ CE, or the ability to obtain one within the required timeframe.

You'll stand out, going above and beyond our minimum requirements if you...

 * Have a Master's degree in Computer Science, Information Technology, or a related field - OR - 10+ years of equivalent professional experience
 * Advanced Linux expertise, particularly with RHEL, including hardening, troubleshooting, performance tuning, and lifecycle management.
 * Certifications such as RHCE, VMware VCP, NetApp, cloud, or advanced cybersecurity credentials.
 * Experience using Ansible, Python, PowerShell, or similar tools to automate builds, configuration, compliance, and routine administration.
 * Knowledge of enterprise networking, multi-site connectivity, VPNs, load balancing, HPC, or specialized cloud environment.
 * Experience leading technical projects, mentoring administrators, or coordinating work across teams.
 * A record of evaluating emerging technologies and turning practical improvements into secure, reliable operational capabilities.

## Description

* Serve as a senior escalation point for complex issues involving operating systems, virtualization, storage, networking, hardware, and security.
 * Provide advanced Linux administration across RHEL-based systems, including services, authentication, permissions, package management, performance, scripting, and hardening.
 * Administer and integrate Windows Server, Active Directory, Group Policy, DNS/DHCP, VMware, Hyper-V, NetApp, enterprise storage, and HPC or cloud platforms.
 * Plan and execute patches, upgrades, migrations, technology refreshes, and mature lifecycle management activities with minimal operational disruption.
 * Monitor system performance, capacity, availability, and security; lead root-cause analysis and corrective actions.
 * Configure and troubleshoot network connectivity, VLANs, switch ports, uplinks, and segmentation in coordination with network engineers.
 * Implement STIGs, remediate vulnerabilities, and support RMF, ATO, audit, and continuous-monitoring activities.
 * Improve reliability and efficiency through automation using Ansible, Python, PowerShell, or similar tools.
 * Mentor administrators, lead small technical initiatives, and maintain clear runbooks, configuration records, and status updates.