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Linux Systems Engineer

Lereta, LLC

Pomona, CA

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JOB DETAILS
SALARY
SKILLS
Automation, Cloud Computing, Computer Networks, Computer Science, Computer Security, Cross-Functional, DHCP (Dynamic Host Configuration Protocol), DNS (Domain Name System), F5 Network Software, Firewalls, High Availability, IP (Internet Protocol), IP (Internet Protocol) Routing, Identify Issues, Information Technology & Information Systems, Infrastructure as a Service (IaaS), Kernel Programming, Linux Administration, Linux Operating System, Load Balancing, Machine Tool, Microsoft Windows Azure, Network Administration/Management, Network Protocols, Network Routing, Open Systems Interconnection (OSI), Performance Metrics, Performance Tuning/Optimization, Platform as a Service (PaaS), Problem Solving Skills, Production Systems, Python Programming/Scripting Language, Red Hat Linux Operating System, Root Cause Analysis, SSL-TLS (Secure Socket Layer - Transport Layer Security), Security-Enhanced Linux (SELinux), Software Engineering, Software Patches, Standards Strategy, Systems Engineering, Systems Maintenance, Systems Reliability, TCP/IP (Transmission Control Protocol/Internet Protocol), Team Player, Ubuntu, Use Cases, VLAN (Virtual Local Area Network), VMS Operating System, Virtual Machine (VM)
LOCATION
Pomona, CA
POSTED
30+ days ago

LERETA 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 Responsibilities

  • 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.
  • 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 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

Salary range: $95,9471 - $127,000.00

About the Company

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Lereta, LLC