Senior Linux System Administrator - Active Top-Secret Clearance

Role Summary

Support mission‐critical systems within a classified federal program. Administer Linux environments and AWS cloud infrastructure to maintain secure, highly available services. Implement automation, infrastructure as code, and compliance hardening aligned to DoD standards.

Core Responsibilities

• Administer and maintain Linux servers in classified and unclassified environments using RHEL, CentOS, and Ubuntu.
• Design, implement, and maintain AWS infrastructure including VPC, EC2, EBS, S3, IAM, CloudFormation, CloudWatch, RDS, and EFS.
• Automate provisioning, configuration, deployment, and patching with Ansible, Terraform, or CloudFormation.
• Maintain users, roles, permissions, and security policies per DoD standards.
• Support CI/CD pipelines and DevSecOps practices using tools such as Jenkins, GitLab CI/CD, and AWS CodePipeline.
• Collaborate with cybersecurity teams for continuous monitoring, audit readiness, and incident response.
• Participate in Agile/Scrum sprints and provide infrastructure support to development and QA teams.
• Produce clear documentation for architectures, runbooks, IAC modules, and change records.

Required Qualifications

• Active Top Secret security clearance.
• Bachelor's degree in Computer Science, Information Systems, Engineering, or a related field, or equivalent experience.
• Eight or more years of hands‐on Linux system administration with RHEL, CentOS, and Ubuntu.
• Proven experience managing AWS infrastructure including VPC, EC2, EBS, S3, IAM, CloudFormation, and CloudWatch.
• Strong troubleshooting of networking fundamentals including TCP/IP, DNS, firewalls, and load balancers.
• Working knowledge of security hardening, DISA STIGs, CIS benchmarks, and RMF controls.
• Excellent problem‐solving, documentation, and communication skills.
• Native or bilingual proficiency in English.

Preferred Qualifications

• Experience with container technologies including Docker, Kubernetes, ECS, or EKS.
• Experience with AWS GovCloud or classified AWS regions.
• Certifications such as AWS Certified SysOps Administrator, AWS Solutions Architect, or RHCE.
• DoD 8570 certifications such as Security+ or CISSP.
• Exposure to monitoring tools such as Splunk, Prometheus, Grafana, or Nagios.

Behavioral Competencies

• Detail‐oriented with strong ownership and follow‐through in classified environments.
• Collaborative mindset with cross‐functional teams including security, development, and operations.
• Clear and concise communicator able to document and explain complex systems.
• Proactive, organized, and comfortable operating under change control and audit requirements.

Benefits

• Paid Time Off (PTO): 3 weeks of PTO (including sick leave).
• Holidays: 2 floating holidays and eight public holidays per year.
• Health & Dental Insurance: The company covers 50% of employee health and dental insurance (dependents may be added at an extra cost). Coverage becomes effective after 30 days.
• Life Insurance: Standard Short-Term Disability (STD), Long-Term Disability (LTD), and life insurance at no cost to full-time employees.
• 401(k) Program: Eligible after 90 days with a 4% company match and immediate vesting.
• Profit Sharing: Employees can participate in the company's profit-sharing program without requiring personal contributions.