System Administrator

Reflexive Concepts; Maryland; On-site; USD 120,000 - 180,000; Full time

Job summary

Reflexive Concepts seeks a System Administrator to manage and secure enterprise IT infrastructure across on‑prem, hybrid, and cloud environments. You will install, patch, harden, and monitor Windows and UNIX/Linux systems, while supporting Tier 1–2 help desk activities and incident resolution.

The role requires a TS/SCI clearance with Full Scope Poly, a bachelor’s degree with 10+ years of experience (15 years if no degree), strong Linux skills, and hands‑on experience with IaC tools like Ansible

Qualifications

• Active TS/SCI security clearance with Full Scope Polygraph.
• Bachelor's degree plus ten years as a system administrator on programs of similar scope and complexity; fifteen years’ experience in lieu of a degree.
• In-depth Linux experience.
• Familiarity with PowerShell and Bash scripting languages.
• Experience with system hardening.
• Experience working with ISSOs for system compliance.
• DoD 8570 compliance with IAT Level I is required.
• Must be able to work core hours of 10AM-2PM Monday-Friday.

Responsibilities

• Provide Tier 1 (Help Desk) and Tier 2 (Escalation) support, including problem identification, diagnosis, troubleshooting, and resolution.
• Configure, administer, and maintain Windows and UNIX/Linux operating systems, including software installation, patching, system hardening, and performance tuning.
• Manage IT system infrastructure and associated processes for availability, reliability, security, and performance.
• Collaborate with engineering and development teams to support infrastructure modernization efforts.
• Develop and maintain technical documentation and SOPs.

Skills

Linux Expertise

PowerShell & Bash

Security Clearance TS/SCI

DoD 8570 IAT Level I

Cloud – AWS

DevOps / CI-CD

Infrastructure as Code

System Hardening

Vulnerability Patching

ATO/RMF compliance

Education

Bachelor's degree

15 years experience in lieu of degree

Tools

Ansible

Terraform

Docker

Jenkins

GitLab

ElasticSearch

Kubernetes

AWS

Linux

Windows

Job description

Reflexive Concepts is seeking a skilled System Administrator to join our team!

Duties And Responsibilities

• Work on a fast-paced team providing support for the implementation, troubleshooting, and maintenance of Information Technology (IT) systems supporting critical enterprise applications.
• Manage IT system infrastructure and associated processes, ensuring the availability, reliability, security, and performance of enterprise applications and services.
• Provide day-to-day operations, monitoring, maintenance, and problem resolution for client systems, servers, storage platforms, network devices, and related infrastructure.
• Provide Tier 1 (Help Desk) and Tier 2 (Escalation) support, including problem identification, diagnosis, troubleshooting, and resolution.
• Support the escalation process and communicate system status, issues, and resolutions to agency management and internal stakeholders.
• Assist with hardware support activities, dispatch processes, and issue resolution through completion.
• Configure, administer, and maintain Windows and UNIX/Linux operating systems, including software installation, patching, system hardening, and performance tuning.
• Maintain the integrity and availability of infrastructure components while implementing enhancements to improve reliability, scalability, and operational efficiency.
• Collaborate with engineering and development teams to support infrastructure modernization efforts, including evaluating, testing, and implementing technology solutions that enhance system capabilities.
• Participate in the assessment of existing systems and architectures, providing operational and technical input for initiatives involving automation, DevOps practices, cloud technologies, and application modernization.
• Support the planning, testing, deployment, and sustainment of infrastructure and application changes across on-premises, hybrid, and cloud-hosted environments, as applicable.
• Assist in analyzing operational, security, compliance, and technical considerations associated with infrastructure changes and technology migrations.
• Develop and maintain technical documentation, standard operating procedures, and system configuration baselines.

Required Qualifications

• Active TS/SCI security clearance with Full Scope (FS) Polygraph.
• A bachelor's degree and ten (10) years of experience as a system administrator on programs of similar scope and complexity are required. In lieu of a bachelor's degree, fifteen (15) years of experience is required.
• In-depth Linux experience.
• Familiarity with PowerShell and Bash scripting languages.
• Experience with system hardening.
• Experience working with ISSOs for system compliance.
• DoD 8570 compliance with Information Assurance Technical (IAT) Level I is required.
• Must be able to work core hours of 10AM-2PM Monday-Friday. Exceptions will be considered on a case-by-case basis.

Technology Stack

• AWS
• Ansible
• Docker
• ElasticSearch
• Terraform
• Jenkins
• Linux
• Windows
• GitLab

Desired Skills

• Familiarity with cloud platforms such as AWS.
• Experience with infrastructure automation, configuration management, or Infrastructure as Code (IaC) tools such as Ansible, Terraform, or AWS CloudFormation.
• Experience supporting DevOps practices, CI/CD pipelines, or automated deployment processes.
• Familiarity with containerization technologies such as Docker or Kubernetes.
• Experience performing vulnerability remediation, security patching, and STIG implementation.
• Experience supporting Authority to Operate (ATO) processes, RMF activities, and security compliance initiatives.