Sr. Linux Administrator with Security Clearance

Title: Senior Linux Platform Engineer Type: Contract 6+ months Location: Cambridge, MA on Site *MUST HAVE ACTIVE SECRET CLEARANCE* We are seeking a Senior Linux Platform Engineer to build, automate, and operate secure, scalable infrastructure platforms that support modern software delivery. This role requires deep expertise in Linux administration, Kubernetes, containerization, CI/CD, and infrastructure automation.
Responsibilities

• Design, deploy, and manage Linux-based platform infrastructure with a focus on automation, reliability, and security.
• Build and support containerized environments using Podman and Kubernetes.
• Develop Infrastructure as Code solutions using Ansible, including reusable playbooks, roles, and collections.
• Create and maintain CI/CD pipelines in GitLab, incorporating testing, security scanning, and automated deployments.
• Manage Sonatype Nexus repositories for container images, Helm charts, and software packages.
• Deploy and administer HashiCorp Vault for secrets management and credential rotation.
• Build automation tools and integrations using Python.
• Implement monitoring, logging, and alerting solutions for platform services.
• Partner with engineering, security, and SRE teams to establish platform standards and best practices.
• Mentor engineers on automation, Kubernetes, and DevOps methodologies. Minimum Qualifications
• 5+ years of Linux administration experience, preferably with RHEL.
• 3+ years of experience with Kubernetes in production environments.
• Experience with Podman, Docker, or similar container technologies.
• Strong expertise in Ansible and Infrastructure as Code practices.
• Experience building and supporting GitLab CI/CD pipelines.
• Hands-on experience with HashiCorp Vault and Sonatype Nexus.
• Proficiency in Python scripting and automation.
• Strong knowledge of Linux networking, security hardening, and system troubleshooting.
• Experience implementing monitoring and observability solutions.

Preferred Qualifications

• Experience building and operating internal platform engineering solutions.
• Knowledge of Packer, Helm, and Kubernetes networking concepts.
• Experience with DevSecOps and software supply chain security.
• Strong technical documentation and cross-functional communication skills.
• Proven ability to lead technical initiatives and mentor junior engineers. Technologies RHEL, Kubernetes, Podman, Ansible, GitLab CI/CD, HashiCorp Vault, Nexus Repository Manager, Packer, Python, Helm, Infrastructure as Code (IaC), DevOps, DevSecOps, Monitoring and Observability. Medical, dental, and vision insurance are available to qualified candidates who meet eligibility requirements.