Linux Systems Engineer

Lereta Llc; Pomona (CA); On-site; Full time

Job summary

A technology company in Pomona, CA is seeking an experienced Linux Systems Engineer to enhance its enterprise infrastructure. Responsibilities include designing and maintaining Linux systems across cloud and on-premise platforms. The ideal candidate has over 10 years of experience in Linux engineering, strong skills in cloud infrastructures, and a solid foundation in networking. This role focuses on collaboration with various technical teams to ensure system reliability and security, alongside performance optimization.

Qualifications

• 10+ years in Linux systems engineering/administration in production environments.
• Experience in cloud infrastructures, particularly Azure.
• Expertise in load balancing and performance tuning.

Responsibilities

• Design, implement, and support Linux-based systems in cloud and on-premise.
• Collaborate with App/Network/SecOps teams and document architectures.
• Implement security compliance measures and system hardening.

Skills

Linux systems engineering

Cloud infrastructure (Azure)

Networking troubleshooting

Automation (C, Python)

Load balancing (F5 BIG-IP, HAProxy)

Performance tuning

Security compliance

Education

Bachelor’s Degree in Computer Science or related field

Tools

F5 BIG-IP

HAProxy

Linux (RHEL/Ubuntu)

Job description

901 Corporate Center Dr
Pomona, CA 91768, USA

Description

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 HAProxyfor 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 Degreein Computer Science, Information Technology, Engineering, or a related field
• Equivalent experiencein Linux systems engineering, cloud infrastructure, and networking may be considered in place of formal education

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

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