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# Senior DevOps / Site Reliability Engineer (SRE)

- **Company:** CASTELLO SYSTEMS, INC.
- **Location:** Washington, DC, United States
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Amazon Web Services, Application Layers, Systems Engineering, Bash Shell, Ubuntu (Operating System), CentOS, Cloud Computing, Cloud Engineering, Linux, DevOps, Domain Name System (DNS), Github, Python (Programming Language), Linux System Administration, Networking Basics, Red Hat Enterprise Linux, Reliability Engineering, Ansible, Prometheus, Software Engineering, Toolchain, Scripting, Load Balancing, Grafana, Infrastructure as Code (IaC), Gitlab, Git, Cloudformation, Containerization, Kubernetes, Infrastructure Automation Frameworks, Cloudwatch, Software Coding, Terraform, Splunk, Devsecops, Docker, Jenkins
- **Published:** August 4, 2026
- **Apply:** https://www.clearancejobs.com/jobs/9076013/senior-devops-site-reliability-engineer-sre

## About the Role

Clearance Required: Active TS/SCI required; CI Polygraph preferred, Full Scope Polygraph highly preferred. Candidates eligible for polygraph upgrade will be considered., Active TS/SCI clearance
CI Polygraph preferred; Full Scope Polygraph highly preferred (upgrade sponsorship available for qualified candidates)
6+ years of DevOps, Site Reliability Engineering, Systems Engineering, or Cloud Engineering experience
Strong AWS experience supporting production environments
Expert-level Linux administration and troubleshooting
Strong scripting and automation experience using Python, Bash, or similar languages
Experience building and maintaining CI/CD pipelines
Experience with containerization technologies such as Docker and Kubernetes
Experience with Infrastructure as Code (Terraform, CloudFormation, Ansible, or similar)
Strong understanding of networking fundamentals, DNS, load balancing, storage, and security
Excellent troubleshooting and problem-solving skills
Ability to successfully complete a live coding interview
Preferred Qualifications
AWS Solutions Architect, SysOps Administrator, or DevOps Engineer certification
Experience supporting Intelligence Community or DoD classified environments
Experience with Kubernetes orchestration at scale
Experience with Prometheus, Grafana, ELK, Splunk, CloudWatch, or similar monitoring platforms
Familiarity with Git, GitLab, GitHub Actions, Jenkins, or similar DevSecOps toolchains
Experience implementing security controls within cloud-native architectures

## Description

We are seeking an experienced Senior DevOps / Site Reliability Engineer (SRE) to support a mission-critical national security program. This position is ideal for a hands-on engineer with deep expertise in AWS cloud environments, Linux systems administration, infrastructure automation, and software development. The successful candidate will help design, build, automate, secure, and maintain highly available production environments supporting classified operations.

Candidates must possess strong coding skills and be comfortable completing a technical coding interview as part of the hiring process.

Responsibilities
Design, implement, and maintain highly available cloud infrastructure within AWS environments.
Develop and maintain Infrastructure as Code (IaC) using tools such as Terraform, CloudFormation, or similar technologies.
Build, manage, and optimize CI/CD pipelines to support rapid, secure software delivery.
Administer and troubleshoot enterprise Linux environments (RHEL, CentOS, Ubuntu, Amazon Linux).
Monitor system health, performance, and reliability using modern observability platforms.
Automate operational tasks using Python, Bash, or similar scripting languages.
Troubleshoot production issues across infrastructure, networking, and application layers.
Collaborate with software engineers to improve application reliability, scalability, and performance.
Implement security best practices and ensure compliance with government security requirements.
Participate in on-call support and incident response as required.


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