Linux Systems Engineer

Linux Systems EngineerLERETA is seeking a Linux Systems Engineer to support and enhance our enterprise infrastructure environments. The role is responsible for the design, implementation, and ongoing support of Linux-based systems across both cloud and on-premise platforms. The ideal candidate will have strong technical expertise, a disciplined approach to system reliability and security, and the ability to collaborate effectively across technical teams.Key ResponsibilitiesLinux 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.Azure infrastructure: Build and secure IaaS/PaaS (VMs, VNets, NSGs, UDRs, Azure Load Balancer, Azure Firewall, Storage).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 availabilityStrong 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 securityIn-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/TLSAbility 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 incidentsEducation and Experience:10+ years in Linux systems engineering/administration in production environmentsExperience designing, building, and supporting mission-critical infrastructure across Azure and on-prem environmentsExperience writing C and Python for systems tooling, performance, or networking use casesHands-on experience designing, deploying, and tuning F5 BIG-IP and HAProxyStrong 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 fieldEquivalent experience in Linux systems engineering, cloud infrastructure, and networking may be considered in place of formal educationSalary range: $95,947 - $127,000.00This is a hybrid position and candidates need to be able to commute to Pomona, CA.Equal Opportunity Employer/Protected Veterans/Individuals with Disabilities This employer is required to notify all applicants of their rights pursuant to federal employment laws. For further information, please review the Know Your Rights notice from the Department of Labor.