RedLine Performance Solutions

Job Summary:
RedLine Performance Solutions is a company specializing in high-performance computing solutions engineering services. They are seeking a Senior Linux Systems Administrator responsible for the architecture, operation, and maintenance of a critical High-Performance Computing (HPC) and Kubernetes infrastructure, requiring expertise in cloud-native technologies and system administration.
Responsibilities:
• Design, deploy, and operate highly available RKE2 Kubernetes clusters, including multi-control-plane environments with stable etcd quorum
• Manage Kubernetes versioning upgrades and compatibility, along with cluster certificate authorities and trust chains
• Oversee complete lifecycle of Kubernetes nodes (cordon, drain, replacement) and operate container runtimes like containerd
• Tune kubelet behavior, manage resource pressure, and ensure consistent node configuration across all environments
• Design and operate Kubernetes networking (CNI), implement network policies for workload isolation, and manage ingress controllers and DNS configurations
• Implement and enforce security best practices, including RBAC, admission controls, pod security standards, secrets management, and audit logging
• Perform routine systems administration and apply necessary STIGs and OS maintenance to ensure compliance for CUI-level operations
• Integrate Kubernetes with enterprise identity services (LDAP/FreeIPA) and implement SSO with support for CAC/MFA
• Design and operate Kubernetes storage solutions using CSI drivers (Lustre, Weka), manage persistent volumes, and integrate S3 object storage
• Operate and maintain CI/CD infrastructure, including GitLab and container registries (Harbor, Artifactory), to support developer workflows
• Implement comprehensive monitoring, logging, and alerting. Lead incident response, perform capacity planning, and maintain operational runbooks
• Architect for high availability, define RPO/RTO, and implement robust backup, restore, and failover procedures for all stateful services
• Integrate Kubernetes workloads with HPC schedulers like Slurm/PBS and enable seamless, secure job submission and identity mapping between platforms.
Qualifications:
Required:
• An active DoD Top Secret security clearance
• Current Linux+ certification
• Current Security+ certification (or equivalent)
• Proven experience in systems administration, particularly in Linux-based environments
• Extensive hands-on experience designing, building, and operating production Kubernetes clusters
• Deep understanding of Kubernetes networking, security principles (RBAC, Network Policy, Pod Security Standards), and storage (CSI)
• Strong knowledge of container runtimes (containers) and the full node lifecycle
• Experience integrating applications and platforms with identity management systems like LDAP or FreeIPA
• Familiarity with operating CI/CD pipelines and associated tools (e.g., GitLab, Artifactory, Harbor)
Preferred:
• Specific experience with RKE2
• Experience working in secure, compliance-driven environments (e.g., CUI, DoD)
• Knowledge of integrating Kubernetes with HPC schedulers (Slurm, PBS) and high-performance storage (Lustre, Weka)
• Proficiency with observability stacks for monitoring, logging, and alerting
• Experience with Infrastructure as Code (IaC) and configuration management tools
• Demonstrated ability to design and test high-availability and disaster recovery plans
Company:
RedLine Performance Solutions is a world-class provider of high-performance computing (HPC) solutions. Founded in 2000, the company is headquartered in Gaithersburg, USA, with a team of 11-50 employees. The company is currently Early Stage.