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Senior DevOps ​/ Site Reliability Engineer (SRE) with Security Clearance

Job in Washington, District of Columbia, 20001, USA
Listing for: Castello Systems, Inc.
Full Time position
Listed on 2026-08-05
Job specializations:
  • IT/Tech
    Cloud Computing: Infrastructure & Operations, SRE/Site Reliability, Systems Engineer, AWS
Job Description & How to Apply Below
Clearance Required:

Active TS/SCI required; CI Polygraph preferred, Full Scope Polygraph highly preferred. Candidates eligible for polygraph upgrade will be considered.

Position Overview We are seeking an experienced Senior Dev Ops / 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, Cloud Formation, 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.

Required Qualifications
Active TS/SCI clearance
CI Polygraph preferred;
Full Scope Polygraph highly preferred (upgrade sponsorship available for qualified candidates)
6+ years of Dev Ops, 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, Cloud Formation, 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, Sys Ops Administrator, or Dev Ops Engineer certification
Experience supporting Intelligence Community or DoD classified environments

Experience with Kubernetes orchestration at scale

Experience with Prometheus, Grafana, ELK, Splunk, Cloud Watch, or similar monitoring platforms
Familiarity with Git, Git Lab, Git Hub Actions, Jenkins, or similar Dev Sec Ops  tool chains
Experience implementing security controls within cloud-native architectures
Position Requirements
10+ Years work experience
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