Senior Principal Linux\Windows System Administrator

Modern Technology Solutions Inc•Huntsville, AL

19d

About The Position

MTSI is seeking a highly skilled Senior Linux/Windows System Administrator with extensive experience in integrating Red Hat Enterprise Linux (RHEL) systems into Microsoft Active Directory domains within a secure, enterprise environment. The ideal candidate will have a strong background in Linux and Windows administration, security hardening, and cross-platform integration, ensuring compliance with organizational and regulatory standards.

Requirements

14+ years of total System Administration experience
7+ years of experience in Linux system administration
5+ years managing Red Hat Enterprise Linux in Microsoft Windows/ Azure enterprise environments.
Proven experience integrating Linux systems with Microsoft Active Directory (SSSD, Kerberos, LDAP, Intune).
Strong knowledge of security hardening and compliance standards.
Proficiency in shell scripting and automation tools (Ansible preferred).
Familiarity with virtualization and cloud technologies (Azure preferred).
Excellent troubleshooting and problem-solving skills.
BS or equivalent degree in Computer Science or related field.
Must have the ability to obtain/maintain a US government security clearance.
US citizenship is required.

Nice To Haves

Red Hat Certified Engineer (RHCE) or equivalent certification.
Windows Server Hybrid Administrator Associate or similar Microsoft 365 certifications.
Experience in DoD or other regulated environments with strict security requirements.
Knowledge of SELinux, firewalld, fapolicyd, and secure networking practices.
Experience managing GCC High Microsoft Azure/ Office 365.
Experience configuring & managing Bright High Performance Computing clusters.

Responsibilities

Administer and maintain Red Hat Enterprise Linux & Windows servers and workstations in a mission-critical environment.
Work with the Security and IT teams to develop and implement a plan to deploy RHEL workstations and servers within the CMMC framework for use in our enterprise environment.
Administer and maintain Microsoft Azure and Office 365 services.
Manage all aspects of Windows Active Directory infrastructure including Domain Controllers, DNS servers, DHCP servers, and file servers.
Configure and manage HPC (High Performance Computing) Linux clusters.
Installation, configuration, and support of servers, enterprise storage and associated equipment, network and direct attached storage systems and associated equipment.
Integrate Linux systems with Microsoft Active Directory for authentication and policy management.
Implement and maintain security best practices, including system hardening, patch management, and compliance with security frameworks (e.g., DISA STIGs, CMMC, CIS benchmarks).
Troubleshoot and resolve complex issues related to Linux and Windows interoperability.
Automate administrative tasks using scripting languages (e.g., Bash, Python, Ansible).
Collaborate with security teams to ensure systems meet cybersecurity requirements.
Track and maintain computer assets using asset management tools and ensure asset management systems have up-to-date information.
Monitor system performance and implement proactive measures for optimization and reliability.
Provide analysis related to the design, development, and implementation of hardware and software solutions.
Document system deployments and configurations.
Research and/or contact vendors regarding technical problems and solutions.
Demonstrate professionalism in response to customer requests.