Senior Network Administrator

ATA Engineering, Inc.; San Diego (CA); On-site; USD 90,000 - 175,000; Full time

Job summary

A leading engineering consulting firm in California seeks a Senior Network Administrator to manage WAN infrastructure and VPN services while ensuring network security and telephony systems are optimal. The role requires at least 5 years of experience, strong proficiency with Fortinet firewalls, and comfort working in diverse environments. Competitive salary range of $90,000–$175,000 per year. Interested candidates must be U.S. Persons according to federal regulations.

Qualifications

• 5+ years of relevant experience in WAN, firewall, VPN, and telephony administration.
• Strong proficiency with Fortinet firewalls, including policy management and VPN setup.
• Understanding of networking fundamentals (TCP/IP, routing, switching, DNS, DHCP).

Responsibilities

• Manage and support WAN infrastructure and VPN services.
• Design, configure, and troubleshoot network connectivity.
• Oversee installation and maintenance of telephony systems.

Skills

Strong technical expertise in network security

WAN management

VPN administration

VoIP systems knowledge

Windows server administration

RHEL Linux familiarity

VMware environments

Excellent written and verbal communication

Education

Bachelor’s or master’s degree in Information Technology or related field

Tools

Fortinet firewalls (FortiGate)

FreePBX

network monitoring tools

Job description

ATA Engineering, an employee-owned engineering consulting company, is seeking an experienced Senior Network Administrator to manage and support our WAN infrastructure, Fortinet firewall environment, VPN services, and telephone (VoIP) systems. This hands‑on role requires strong technical expertise in network security, connectivity, and telephony along with the ability to respond to support tickets in a timely and professional manner. The ideal candidate has 5+ years of relevant experience and is comfortable working across Windows, Red Hat Enterprise Linux (RHEL), and VMware environments.

LOCATION:

Essential Duties and Responsibilities:

• Design, configure, maintain, and troubleshoot WAN circuits, routers, and related connectivity
• Manage Fortinet firewall policies, security rules, and firmware updates
• Administer site‑to‑site and remote‑access VPN solutions for secure connectivity
• Oversee installation, configuration, maintenance, and troubleshooting of telephone systems (VoIP, SIP trunks, and related endpoints)
• Monitor network performance, firewall health, VPN tunnels, and telephony quality; respond to alerts and resolve issues proactively
• Create and update network and telephony documentation, diagrams, and standard operating procedures
• Respond to and resolve support tickets related to WAN, firewalls, VPN, and telephony in a ticketing system (OS Ticket)
• Collaborate with team members on projects such as network upgrades, migrations, security audits, and new site deployments
• Perform routine maintenance, patching, and backups for managed systems
• Supervise and mentor Network Administrators

Requirements:

• Must be a U.S. Person as defined by 22 C.F.R. § 120.15
• Bachelor’s or master’s degree in Information Technology, Computer Science, or a related field from an accredited college/university with an excellent academic record
• Minimum of 5 years of hands‑on experience in WAN, firewall, VPN, and/or telephony administration
• Strong proficiency with Fortinet firewalls (FortiGate), including policy management, VPN setup, and troubleshooting
• Experience with WAN technologies and negotiating contracts with ISPs
• Solid knowledge of VoIP/telephony systems; knowledge of FreePBX is a plus
• Familiarity with Windows server administration, RHEL Linux, and VMware vSphere/ESXi environments
• Willingness and ability to efficiently answer and resolve end‑user and infrastructure support tickets
• Understanding of networking fundamentals (TCP/IP, routing, switching, DNS, DHCP)
• Excellent written and verbal communication skills

Preferred Skills:

• Certifications such as Fortinet NSE 4/5/6/7, CCNA/CCNP, or an equivalent
• Certifications such as CISSP/CASP/CISM
• Experience with Fortinet ecosystem tools (FortiClient EMS, FortiAuthenticator, FortiAnalyzer)
• Knowledge of network monitoring tools
• Experience with compliance to CMMC/NIST 800-171

Salary Range:

• Experienced Professionals and Managers: $90,000–$175,000 per year

HOW TO APPLY

We appreciate your interest in ATA Engineering and request that you submit the following materials if you are qualified and wish to join our team of employee‑owners at ATA Engineering:

• A copy of your up‑to‑date college transcripts. You may email them, or request that an official transcript be sent directly to the address below. If your transcript contains identifying information such as Social Security Number and/or date of birth, please delete this information prior to submitting your transcripts.
• A statement confirming that you meet the definition of a US Person as defined by 22 C.F.R. § 120.15.

Please note: We prefer electronic copies of all documents, but you may also mail them to the address below if necessary. Many of our contracts require access to government, defense, and classified information. We cannot consider your application unless you are a US Person. Once we have reviewed your qualifications, you will be contacted by email regarding the status of your application.

ATA Engineering, Inc., is an Equal Opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, disability, protected Veteran status, or any other characteristic protected by applicable federal, state, or local law.

If you are a qualified individual with a disability or a disabled veteran, you have the right to request an accommodation if you are unable or limited in your ability to use or access our career center as a result of your disability. To request an accommodation, contact an ATA Engineering, Inc., Human Resources Representative at [e-mail].