Security Standards Support Jobs

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Systems Administrator/Helpdesk Engineer

Leidos St. Louis, MO

St. Louis, MO

Today

$73k - $133k/yr Full time Active Directory Ansible Aws Govcloud

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Job Description

Leidos is hiring a mid-level Systems Administrator / Helpdesk Engineer to support the Chinook Program for an Intelligence Community customer. This onsite role in St. Louis, MO includes Tier 1 and Tier 2 helpdesk service, Windows and Linux system administration, infrastructure support, and documentation work within a cleared environment.

Key Responsibilities

Deliver Tier 1 and Tier 2 helpdesk support to resolve hardware, software, network, and system issues in a timely manner.
Install, configure, maintain, and troubleshoot Windows and Linux workstations and servers.
Manage user accounts, permissions, and access controls using Active Directory and related identity management tools.
Monitor system performance, proactively identify issues, and apply corrective actions to help maintain system availability.
Install software updates, security patches, and operating system upgrades according to program and customer requirements.
Document incidents, service requests, troubleshooting steps, and system changes using established ticketing systems.
Coordinate with systems engineers, cybersecurity personnel, and network administrators to resolve complex technical problems.
Support system backups, disaster recovery activities, and configuration management processes.
Assist with workstation deployments, hardware refreshes, asset management, and inventory tracking.
Participate in on-call support and scheduled maintenance activities as required.
Maintain automation scripts and infrastructure as code using tools such as Ansible, PowerShell, and Bash.
Maintain system documentation, configuration baselines, and support CM and RM activities.
Participate in security audits, incident response, and operational readiness activities.
Contribute to continuous process improvements to enhance customer experience and operational efficiency.

Required Qualifications

Active Top Secret/SCI eligibility with the ability to pass a Polygraph examination.
US citizenship required per contract.
Bachelor’s degree in Computer Science, Engineering, Information Technology, or related discipline, and 4-8 years of prior relevant experience, or Master’s with 2-6 years of prior relevant experience. Experience may be substituted for degree requirements.
DoD 8570 IAT Level II or III certification (examples include Security+ CE, CASP+, CISSP).
Experience with cloud platforms including AWS GovCloud and Azure Government, including hybrid cloud environments.
Experience with Linux (Red Hat Enterprise Linux or CentOS) and Windows Server system administration.
Experience with virtualization platforms and management tools including VMware and KVM.
Experience with automation and scripting using Ansible, Bash, PowerShell, or Python.
Familiarity with STIG compliance, system hardening, ACAS scans, and RMF processes.
Strong understanding of enterprise networking, identity and access management, and storage concepts.
Proven ability to troubleshoot, document, and independently lead systems-related projects.
Experience supporting IC or DoD classified environments.

Technologies

Active Directory
Ansible
PowerShell
Bash
Python
Windows
Linux
Red Hat Enterprise Linux
CentOS
Windows Server
VMware
KVM
AWS GovCloud
Azure Government
STIG compliance
ACAS
RMF

Preferred Qualifications

Experience supporting an Intelligence Community customer or GEOINT missions.
Familiarity with DevOps tools and pipelines (for example, Git, Jenkins, Docker).
Knowledge of enterprise backup solutions, DNS, DHCP, Active Directory, and PKI.
Strong troubleshooting and root cause analysis capabilities.
Ability to work independently while collaborating effectively across technical teams.
Strong organizational skills with attention to detail and documentation.
Adaptability and willingness to learn new technologies in a dynamic environment.

Work Schedule and Shift Coverage

Candidate must commit to covering the morning shift starting at 6 AM EST or covering the evening shift working until 10 PM EST.

Location

St. Louis, MO (onsite)

Additional locations where the position may be performed:

Gaithersburg, MD (program’s primary work location)
Alexandria, VA
Chantilly, VA
Englewood, CO
St. Louis, MO
Tucson, AZ

Compensation

Pay Range: USD 73,450 - 132,775 per year

Benefits

Competitive compensation
Health and Wellness programs
Income Protection
Paid Leave
Retirement

Posting Information

Original posting date: September 16, 2026

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