> Markdown version of [/jobs/ext/3695868-linux-system-administrator](https://www.wearedevelopers.com/jobs/ext/3695868-linux-system-administrator). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md).

---

# Linux System Administrator

- **Company:** Dexian Signature
- **Location:** Herndon, VA, United States
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Amazon Web Services, Amazon Elastic Compute Cloud, Amazon S3, Backup Devices, Bash Shell, Ubuntu (Operating System), CentOS, Cloud Computing Security, Cloud Database, Configuration Management, Information Systems, Continuous Integration, Linux, DevOps, Disaster Recovery, Identity and Access Management, Python (Programming Language), Key Management, Network Security, Linux System Administration, MongoDB, Octopus Deploy, Red Hat Enterprise Linux, Cloud Services, Ansible, Prometheus, Runbook, SonarQube, Oracle Linux, Software Vulnerability Management, Scripting, Istio, Grafana, HybridCloud, Amazon Virtual Private Cloud (VPC), Gitlab, Cloudformation, Containerization, Kubernetes, Hashicorp, Enterprise Integration, Non-relational Database, CIS Benchmarks, Cloudwatch, Puppet, Terraform, Splunk, Network Server, OpenSearch, Docker
- **Published:** October 12, 2026
- **Apply:** https://www.clearancejobs.com/jobs/9235520/linux-system-administrator

## About the Role

We are seeking a mid-senior level Linux System Administrator with strong AWS Dev/Sec/Ops experience to join an operational engineering team supporting mission-critical systems. The position is fully onsite at a cleared facility and requires a current Full Scope security clearance. The ideal candidate brings hands-on Linux administration skills, cloud automation experience in AWS, a security-first mindset, and familiarity with CI/CD, infrastructure as code, and operational monitoring at scale., * Current Full Scope security clearance at time of hire.

 * 5+ years of experience administering Linux systems in production environments (mid-senior level).
 * 3+ years of hands-on AWS experience architecting, deploying, and operating secure cloud solutions.
 * Strong experience with configuration management and automation tools (Ansible, Puppet).
 * Proven experience with Infrastructure-as-Code (Terraform or CDK/CloudFormation).
 * Familiarity with container technologies and orchestration (Docker, Kubernetes/EKS/Karpenter, Helm).
 * Solid scripting skills (Bash, Python, or similar) for automation and tooling.
 * Active CI/CD pipeline implementation experience (GitLab, ArgoCD, SonarQube, Anchore).
 * Experience with service mesh or advanced networking in Kubernetes.
 * Experience with non-relational databases, such as MongoDB
 * Knowledge of cloud security best practices, IAM, network security, encryption, and monitoring.
 * Experience applying and validating security baselines such as DISA STIG or CIS Benchmarks.
 * Excellent troubleshooting and problem-solving skills with an operations mindset.
 * Strong communication skills and ability to work collaboratively with both in-house developers and end users to support delivery of end-to-end solutions.
 * Must be able to work 100% onsite at a cleared facility and comply with site security policies.
Preferred / Nice-to-Have

 * Familiarity with zero trust concepts and implementation experience.
 * Experience with secrets management solutions (HashiCorp Vault, AWS Secrets Manager).
 * Experience with geographically dispersed highly available cloud solutions
 * Experience with hybrid cloud implementation
 * Professional certifications such as RHCE, AWS Certified SysOps Administrator, AWS Certified DevOps Engineer.
 * Prior experience supporting DoD or other federal agency information systems.

## Description

* Design, deploy, operate, and maintain Linux-based servers and clusters (RHEL/CentOS/Oracle Linux/Ubuntu) in development, test, staging, and production environments.
 * Operate and secure AWS infrastructure components (e.g. EC2, VPC, IAM, EBS, S3, RDS, EKS, Lambda, CloudWatch).
 * Implement and maintain infrastructure-as-code using tools such as CDK, CloudFormation, and Terraform.
 * Develop and maintain automation and CI/CD pipelines (e.g. GitLab, ArgoCD) to include pipeline integration of security tooling (e.g. SonarQube, Anchore)
 * Harden systems to meet DISA STIG, CIS benchmarks, or agency-specific security baselines; apply patches and security updates in a controlled manner.
 * Perform system hardening, vulnerability remediation, and coordinate with security teams for incident response and forensics.
 * Create, maintain, and improve monitoring, alerting, and logging solutions (ELK/Opensearch, Prometheus, Grafana, CloudWatch, Splunk).
 * Troubleshoot and resolve performance, stability, and availability issues across infrastructure and services.
 * Implement backup, disaster recovery, and business continuity procedures.
 * Collaborate with developers, security engineers, and operations staff to design secure, scalable solutions.
 * Maintain clear documentation, runbooks, and configuration management records.
 * Participate in on-call rotations and provide after-hours support as needed.