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Job Description

We are seeking an experienced Senior Systems Administrator to manage, maintain, and operate our IT infrastructure. This role is responsible for the reliability, performance, and day-to-day operation of on-premises and virtualized environments, including VMware vSphere, Windows and Linux servers, Docker environments, advanced firewalls, VPNs, and Web Application Firewalls (WAFs). The ideal candidate is hands-on, operationally strong, and comfortable supporting business-critical systems.

After probation and at discretion of manager, this position has potential to move to a hybrid work from home 2 days a week.

Hours

Full-time, Monday-Friday 8:00am-5:00pm

Location

Kakaako, Honolulu, Oahu

Pay

$95,000 to $130,000 a year

Responsibilities

Infrastructure & Systems Management

· Administer and maintain VMware vSphere infrastructure, including host management, VM provisioning, performance tuning, and capacity planning.

· Install, configure, manage, and support Windows Server environments (Active Directory, DNS, DHCP, Group Policy, file and print services).

· Administer and support Linux servers (e.g., RHEL, Ubuntu, or equivalent).

· Administer and support Docker environments on Linux servers, including host configuration, upgrades, and troubleshooting.

· Perform system patching, upgrades, maintenance, and lifecycle management.

· Monitor system health, availability, and performance; troubleshoot and resolve infrastructure issues.

· Plan and execute infrastructure upgrades and improvements.

Network & Platform Operations

· Configure, manage, and maintain advanced firewalls (e.g., next-generation firewalls), including rule sets, NAT, routing, and logging.

· Administer VPN solutions (site-to-site and remote access).

· Manage and maintain Web Application Firewalls (WAFs) to support application availability and protection.

· Maintain reliable and secure network connectivity across environments.

Backup, Recovery & Reliability

· Implement and maintain backup and disaster recovery solutions.

· Perform backup validation, restore testing, and disaster recovery exercises.

· Ensure system availability, redundancy, and recoverability.

Automation, Documentation & Support

· Develop and maintain automation using PowerShell, Bash, or similar scripting tools.

· Create and maintain system documentation, diagrams, and operational runbooks.

· Provide Tier 2 / Tier 3 support for infrastructure-related incidents and service requests.

· Participate in on-call rotations and scheduled after-hours maintenance

Qualifications

• 5+ years of experience in a System Administrator or infrastructure-focused role.
• Strong hands-on experience with VMware vSphere.
• Strong experience administering Windows Server environments.
• Solid experience administering Linux servers.
• Experience supporting Docker-based workloads in production environments.
• Experience managing enterprise-grade firewalls, VPNs, and WAFs.
• Strong understanding of networking fundamentals (TCP/IP, routing, DNS, VLANs).
• Experience monitoring and troubleshooting complex systems.