L3 Systems Engineer

Title: L3 Systems Engineer with expertise in both Linux (RHEL/CentOS) and Oracle Solaris
Location: Irvine, California. (Hybrid)
Standard working hours are 9:00 a.m.-6:00 p.m. Pacific Time.

We are seeking an experienced L3 Systems Engineer with expertise in both Linux (RHEL/CentOS) and Oracle Solaris to support mission-critical financial applications. You will serve as the highest escalation point for complex platform issues, drive performance optimization, and lead automation initiatives.

We want all new Associates to succeed in their roles at Ensono. That's why we've outlined the job requirements below. To be considered for this role, it's important that you meet all the required qualifications. If you do not meet all of the Preferred Qualifications, we still encourage you to apply.

Key Responsibilities

Serve as L3 escalation point for complex Linux and Solaris infrastructure issues

Perform deep-dive root cause analysis (RCA) for system failures and performance issues

Lead performance tuning and capacity planning for critical systems

Administer and maintain RHEL/CentOS and Oracle Solaris 10/11 environments

Develop automation scripts (Shell, Python, Ansible) for provisioning, monitoring, and maintenance

Manage Solaris Zones, LDOMs, and Linux virtualization (KVM/VMware)

Configure and manage ZFS, LVM, VxFS file systems

Execute system patching, upgrades, and security hardening

Participate in Major Incident bridges and coordinate with vendors (Oracle, Red Hat)

Mentor L1/L2 engineers and conduct knowledge transfer sessions

Create and maintain technical documentation, SOPs, and runbooks

Required Skills

Linux (RHEL/CentOS):

Expert in RHEL 7/8/9 administration, kernel tuning, and troubleshooting

Strong experience with LVM, ext4, XFS, NFS, systemd

Proficient in performance analysis (sar, vmstat, iostat, strace)

Solaris (Oracle Solaris 10/11):

Expert in Solaris administration, SMF, and ZFS

Strong experience with Solaris Zones, LDOMs

Proficient in performance analysis (DTrace, mdb, prstat)

Common:

Expert Shell scripting (Bash/Ksh); proficient in Python

Experience with Ansible or similar automation tools

Strong networking skills (TCP/IP, DNS, NFS, NIS)

Experience with enterprise monitoring tools (Splunk, Grafana, Nagios)

Solid understanding of ITSM processes (Incident, Problem, Change)

Preferred Qualifications

RHCE or RHCSA certification

Oracle Certified Professional - Solaris

Experience with clustering (Solaris Cluster, Veritas, Pacemaker)

Experience with SAN/NAS storage and enterprise backup solutions

Banking or financial services domain experience

ITIL Foundation certification

Education

Bachelor’s degree in computer science, Information Technology, or equivalent