> Markdown version of [/jobs/ext/1450122-sr-infrastructure-cloud-security-systems-admin-3](https://www.wearedevelopers.com/jobs/ext/1450122-sr-infrastructure-cloud-security-systems-admin-3). 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).

---

# Sr Infrastructure, Cloud & Security Systems Admin 3

- **Company:** NineFX, Inc.
- **Location:** Fort Meade, MD, United States
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Microsoft Windows, Application Programming Interfaces (APIs), Amazon Web Services, Amazon Elastic Compute Cloud, Application Integration Architecture, Bash Shell, Unix, Cloud Computing Security, Cyber Security, Computer Networks, Continuous Integration, Linux, Domain Name System (DNS), Python (Programming Language), Public Key Infrastructure, Windows PowerShell, Red Hat Enterprise Linux, Ansible, Service-Oriented Architecture, VMware VSphere, SSL Certificate Management, Gitlab, Kubernetes, Information Technology, Nessus, Terraform, Docker
- **Published:** July 26, 2026
- **Apply:** https://www.clearancejobs.com/jobs/9058138/sr-infrastructure-cloud-security-systems-admin-3

## About the Role

* Active TS/SCI with Full Scope Polygraph (must already be held)
 * IAT Level II (Security+ CE, GSEC, CySA+, CCNA Security, or GICSP)
 * 15+ years of system administration experience supporting complex enterprise or DoD systems.
 * Bachelor's degree in a technical field (or 5 additional years of experience in lieu of degree).
 * Hands-on administration experience with Linux OS (RHEL9, Talos).
 * Experience building host image templates using automation tools such as Terraform, Packer, SALT, Ansible, RHEL Satellite, and Jumphost technologies.
 * Familiarity with Trellix Endpoint Security, Nessus Security Center, UAM, rsyslog, and auditd.
 * Ability to script and automate tasks using Python, PowerShell, or Bash.
 * Understanding of system interdependencies within service-oriented architectures.
 * Proven ability to analyze and resolve complex hardware, software, and application integration issues.

## Description

The System Administrator Lvl 3 provides senior-level support for implementing, troubleshooting, securing, and maintaining enterprise IT systems. This role oversees system infrastructure, ensures reliable operations across servers, networks, storage, and endpoints, and provides Tier 1 and Tier 2 support for escalated technical issues., * Support implementation, troubleshooting, and maintenance of IT systems and infrastructure components.

 * Manage daily configuration, operations, monitoring, and issue resolution for server, storage, network, and mobile systems.
 * Provide Tier 1 and Tier 2 help desk support, including problem identification, diagnosis, and resolution.
 * Communicate issue status, escalations, and updates to agency management and internal stakeholders.
 * Support dispatch system operations and participate in hardware-related issue resolution.
 * Configure and administer UNIX and Windows operating systems; perform OS installation, troubleshooting, optimization, and network component configuration.
 * Apply and maintain compliance with DISA STIGs, CVEs, and IAVA requirements.
 * Administer PKI infrastructure, certificate management, DNS, and IP resources.
 * Work with VMware vSphere/vCenter and related APIs.
 * Support Amazon AWS EC2 operations and associated services.
 * Provide basic support for containers (Docker, Kubernetes) and GitOps/CI/CD workflows (GitLab).


## Related Videos

- [Docker network without Docker](https://www.wearedevelopers.com/videos/1418-docker-network-without-docker)
- [Security Pitfalls for Software Engineers](https://www.wearedevelopers.com/videos/726-security-pitfalls-for-software-engineers)
- [Docker Compose: Rediscovered](https://www.wearedevelopers.com/videos/1978-docker-compose-rediscovered)
- [WeAreDevelopers LIVE - Node and Package Security](https://www.wearedevelopers.com/videos/2138-wearedevelopers-live-node-and-package-security)
- [Docker exec without Docker](https://www.wearedevelopers.com/videos/1094-docker-exec-without-docker)
- [Docker build without Docker](https://www.wearedevelopers.com/videos/100114-docker-build-without-docker)

## Related Articles

- [What Are The Top Skills Required For Azure Developers?](https://www.wearedevelopers.com/magazine/77-what-are-the-top-skills-required-for-azure-developers)
- [Dev Digest 134 - Where pixels sing?](https://www.wearedevelopers.com/magazine/477-dev-digest-134-where-pixels-sing)
- [Highest Paying Tech Companies for Developers](https://www.wearedevelopers.com/magazine/220-highest-paying-tech-companies-for-developers)
- [Best Paying Jobs in Technology](https://www.wearedevelopers.com/magazine/256-best-paying-jobs-in-technology)
- [Why Upskilling And Reskilling is Important For Developers](https://www.wearedevelopers.com/magazine/428-why-upskilling-and-reskilling-is-important-for-developers)
- [Is Software Engineering Over-Saturated?](https://www.wearedevelopers.com/magazine/418-is-software-engineering-over-saturated)