Linux System Administrator -Senior - TS ; ONSITE

Linux System Administrator – Senior – Active TS required (ONSITE - 100%)

Visual Soft, Inc. is seeking qualified candidates to work on our efforts with a Prime for their end customer, a federal agency in Huntsville, AL
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Job Title: Senior Linux System Administrator (AWS) – Top Secret Clearance

Location: Huntsville, Alabama (100% Onsite)

Clearance Required: Active Top Secret Clearance (U.S. Citizenship Required)

Employment Type: Full-Time / Permanent

Education: Bachelor’s Degree (B.S.) in Computer Science, Information Systems, or related field

Experience: Minimum 8+ years of hands‑on Linux system administration and cloud operations experience

Job description: We are seeking an experienced Senior Linux System Administrator with proven expertise in AWS cloud environments to support mission‑critical systems within a classified defense program. This position is fully onsite in Huntsville, AL, supporting a federal intel agency. The ideal candidate has deep experience managing RHEL or similar distributions, implementing automation and infrastructure‑as‑code solutions, and maintaining high‑availability, secure cloud environments in compliance with DoD security standards.

• Administer and maintain Linux servers (RHEL, CentOS, Ubuntu) in classified and unclassified environments.
• Design, implement, and maintain AWS infrastructure (VPC, EC2, S3, Cloud Watch, IAM, RDS, EFS).
• Automate provisioning, configuration, and deployment tasks using Ansible, Terraform, or Cloud Formation.
• Monitor system performance, conduct root‑cause analysis, and implement performance tuning.
• Patch and harden Linux systems to meet DISA STIG and RMF compliance requirements.
• Manage user accounts, permissions, and security policies in accordance with DoD standards.
• Support and integrate CI/CD pipelines and Dev Sec Ops  practices.
• Collaborate with cybersecurity teams to ensure continuous monitoring and incident response.
• Participate in Agile/Scrum sprints, providing infrastructure support to development and QA teams.

• Bachelor’s degree in Computer Science, Information Systems, Engineering, or related field.
• 8+ years of hands‑on Linux system administration experience (RHEL, CentOS, Ubuntu).
• Proven experience managing cloud infrastructure in AWS (VPC, EC2, EBS, S3, IAM, Cloud Formation, Cloud Watch).
• Proficiency in troubleshooting networking concepts (TCP/IP, DNS, firewalls, load balancers).
• Familiarity with CI/CD tools (Jenkins, Git Lab CI/CD, AWS Code Pipeline).
• Working knowledge of security hardening (STIGs, CIS benchmarks) and RMF controls.
• Excellent problem‑solving, documentation, and communication skills.

• Familiarity with container technologies (Docker, Kubernetes, ECS/EKS).
• Experience with AWS Gov Cloud or classified AWS regions.
• AWS Certified Sys Ops Administrator or Solutions Architect.
• Red Hat Certified Engineer (RHCE).Security+, CISSP, or equivalent DoD 8570 certification.
• Exposure to monitoring tools (Splunk, Prometheus, Grafana, Nagios).

• 3 weeks of Paid Time Off (PTO that includes sick leave); unused PTO paid out at the end of an employee's anniversary.
• 2 floating holidays and 8 public holidays; floating and holidays expire at the end of each year of service.
• Company covers 50% of health and dental insurance for all full‑time employees; dependents can be added at extra cost.
• Health and dental coverage effective after 30 days or first month following initial 30 working days; employee completes necessary paperwork in first 30 days.
• Provides STD, LTD and one‑time salary‑equivalent life insurance at no cost to all full‑time employees.
• 401(k) program after 90 days of employment with a 4% company match, immediate vesting.
• Company profit‑sharing available to all W‑2 employees with no employee contributions required.