Linux Systems Engineer

Linux engineering: Design, harden, and maintain RHEL/Ubuntu systems; implement HA/DR strategies and patching standards. Networking troubleshooting: Diagnose issues across OSI/TCP/IP layers (DNS/DHCP, routing, VLANs, firewalls, SSL/TLS/certs). Load balancing & traffic management: Deploy, configure, and tune F5 BIG‑IP (LTM/GTM, iRules) and HAProxy for L4–L7 services. Tooling & automation: Develop utilities/services in C and Python ; integrate with CI; create health checks and runbooks. Observability & performance: Implement metrics/logging; profile and tune kernel/app performance; root‑cause analysis for incidents. Security & compliance: System hardening (SELinux, auditd), secrets management, least‑privilege/IAM alignment, vulnerability remediation. Collaboration: Partner with App/Network/SecOps teams; document architectures/runbooks; contribute to post‑mortems and RCA. Core Competencies Expertise in designing, hardening, and maintaining Linux systems (RHEL/Ubuntu) in production environments, with a focus on system security, performance optimization, and high availability Strong hands‑on experience in building, securing, and supporting cloud infrastructures across IaaS and PaaS environments, particularly within Microsoft Azure, including virtual machines, networking, storage, and security In‑depth understanding of networking protocols and troubleshooting at all OSI/TCP/IP layers. Expertise in diagnosing and resolving issues related to DNS/DHCP, routing, VLANs, firewalls, and SSL/TLS Ability to work effectively in a cross‑functional team environment (with App/Network/SecOps teams) to document architectures, create runbooks, and contribute to post‑mortems and root cause analysis for incidents Education and Experience 10+ years in Linux systems engineering/administration in production environments Experience designing, building, and supporting mission‑critical infrastructure across Azure and on‑prem environments Experience writing C and Python for systems tooling, performance, or networking use cases Hands‑on experience designing, deploying, and tuning F5 BIG‑IP and HAProxy Strong networking fundamentals and troubleshooting (TCP/IP, routing, DNS, SSL/TLS) Practical experience building and supporting Azure infrastructure (compute, networking, storage) Bachelor’s Degree in Computer Science, Information Technology, Engineering, or a related field Equivalent experience in Linux systems engineering, cloud infrastructure, and networking may be considered in place of formal education This is a hybrid position based in Pomona, CA. Applicants must be able to commute to the Pomona, CA location. #J-18808-Ljbffr