System Admin

iQuasar, LLC; San Diego (CA); Hybrid; USD 70,000 - 90,000; Part time

Benefits offered by this job

Health insurance

401(k) match

Training opportunities

Flexible work from home options

Job summary

iQuasar, LLC is looking for a skilled Linux System Administrator to join their team in San Diego, CA. This part-time position entails maintaining and securing network infrastructures in a mission-critical setting. Ideal candidates will demonstrate proficiency in Linux, Windows, and macOS system administration, along with experience in managing secure environments.

A Bachelor’s degree in computer science or a related field is preferred, with flexibility for work from home. The role offers competitive benefits including health insurance and a 401(k) match.

Qualifications

• 6+ years of experience with an Associate’s degree or equivalent experience.
• Deep understanding of secure network environments.
• Proficiency in both cloud and on-premises systems.

Responsibilities

• Configure and install network devices and services.
• Monitor network performance for continuous uptime.
• Administer Windows Active Directory and Office 365 environments.

Skills

Linux administration

Windows administration

macOS administration

Networking protocols

Cloud environments

VPN management

CMMC compliance

Education

Bachelor’s degree in computer science or related field

Tools

Intune

Grafana

Job description

iQuasar is seeking a Systems Administrator in San Diego, CA. Our mission is to provide next generation cutting‑edge technologies and offer competitive compensation and benefits such as health, vision and dental insurance, a matching 401(k) plan, and excellent training.

Job Title

Linux System Administrator

Location

San Diego, CA

Job Type

Part Time (up to 25 hours per week)

Clearance Level

Secret

Job Description

iQuasar is seeking an experienced Information Systems Administrator (SysAdmin) to assist in the design, implementation, maintenance, and support of the corporate network infrastructure in a mission‑critical environment. The successful candidate will have a strong foundation in secure network architecture, system integration, Windows, macOS, and Linux administration, and familiarity with the Cybersecurity Maturity Model Certification (CMMC) framework.

Requirements

• Well‑versed in Windows, Linux, and macOS.
• 6+ years of experience with an Associate’s degree and DoDInst. 8570 IAT Level 2 in lieu of a bachelor’s degree; or 8+ years of experience and DoDInst. 8570 IAM Level 2 in lieu of a bachelor’s degree; or 4+ years of experience with a master’s degree in information systems, Computer Science or similar.
• 3‑4 years of experience managing secure network environments and infrastructure.
• Deep understanding of networking protocols (IPSEC, HSRP, BGP, OSPF, 802.11, QoS, SSH), VPNs and firewalls.
• Proficient in both cloud and on‑premises environments and establishing a software‑development focused environment.
• Solid understanding of OSI or TCP/IP models and software‑defined networking with access‑control policies.
• Proficiency in managing Windows, macOS and Linux‑based systems.
• Experience supporting federal systems and complying with federal cybersecurity standards.
• Familiarity with CMMC Level 2+ controls and implementation practices.
• Experience with network monitoring and diagnostic tools.

Responsibilities

• Configure and install network devices and services such as routers, switches, firewalls, load balancers, VPN, and QoS.
• Perform network maintenance and system upgrades, including service packs, patches, hot fixes, and security configurations.
• Monitor network performance and health to ensure continuous system uptime and reliability.
• Track system resource utilization, trending, and capacity planning using logging and analytical tools such as Intune and Grafana.
• Provide Level 2/3 support and troubleshooting for network issues.
• Execute routine updates and configuration cycles for Windows 11/Server 2016/2019, Ubuntu, and other Linux distributions, as well as macOS systems.
• Administer and support Windows Active Directory, Azure Active Directory, and Office 365 environments.
• Configure and manage WireGuard VPN and establish isolated network and safe computing environments.
• Ensure compliance with configuration and change‑management processes.
• Implement and support CMMC compliance practices, including documentation, secure access control, and logging of system data and policies.
• Collaborate with security personnel and vendors to resolve problems and implement cybersecurity best practices.
• Work closely with development teams and platform engineers to deploy robust, CMMC‑compliant network environments that facilitate efficient software development.

Desired

• 8+ years of experience handling secure networks and infrastructure.
• Security+ or equivalent DoDInst. 8570 IAT Level II certification.
• Advanced Linux/Unix system administration and security hardening experience.
• Active top secret clearance or top secret eligible; SCI eligibility preferred.

Education

• Bachelor’s degree in electrical engineering, computer engineering, computer science, information technology, or a related quantitative field.

Equal Opportunity Employer

iQuasar is proud to be an Equal Employment Opportunity Employer. All employment decisions are based on qualifications, merit, and business need. The company does not discriminate based on race, religion, color, national origin, political affiliation, sex, sexual orientation, gender identity, age, marital or parental status, veteran status, disability, genetic information, membership in an employee organization, retaliation, military service, or any other characteristic protected by law.

Flexible work from home options available.