Linux Engineer

At LERETA, we are on the cutting edge of technology, delivering innovative solutions that drive efficiency and excellence for our clients. We're looking for a talented and experienced *Linux Engineer* to join our team and help design, deploy, and maintain scalable, secure, and high-performing infrastructure solutions in cloud and on-prem environments. If you have a strong background in Linux systems engineering, cloud infrastructure, and network troubleshooting, and thrive in a collaborative environment, we want to hear from you.Apply now, read the job details by scrolling down Double check you have the necessary skills before sending an application.In this role, you will work with a talented team of engineers to enhance our infrastructure, focusing on system hardening, load balancing, automation, and security. You'll be instrumental in building reliable solutions that meet the demands of mission-critical applications, all while ensuring optimal performance, security, and compliance.Are you ready to make an impact and push the limits of technology? Apply today and help us shape the future at LERETA!*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. xijylhu Pay: $95,947.41 - $127,000.00 per yearBenefits:* 401(k)* Dental insurance* Health insurance* Paid time off* Vision insuranceApplication Question(s):* Is your desired pay in line with what is posted for this position? Ability to Commute:* Pomona, CA 91768 (Required)Work Location: In person

Created: 2026-04-03