Senior Systems Administrator - Cloud, DevOps & Security

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 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