Multisite Network Administrator – Firewalls & VPNs

CERTEX USA; Houston (TX); On-site; USD 75,000 - 85,000; Full time

Benefits offered by this job

Profit sharing

Uniforms provided

Boot allowance

Vacation and sick leave

Holidays

401k match

Medical/dental/vision insurance

Life insurance

Job summary

CERTEX USA is looking for an experienced Network Administrator in Houston to join our Team. This role maintains and troubleshoots network equipment, ensures reliable connectivity across branch locations nationwide, and collaborates with IT staff to improve performance.

Based in Houston, you will support firewalls, switches, and wireless systems, work with vendors, and participate in an on-call rotation to resolve urgent network issues after hours.

Qualifications

• Hands-on experience administering enterprise firewalls in a multi-site environment; SonicWall experience strongly preferred.
• Experience with firewalls, network switches, and wireless equipment. Experience with SonicWall, Cambium, Aruba, Ubiquiti, or Meraki systems is preferred.
• Strong understanding of computer networking, internet connectivity, wireless systems, VPNs, and network security.
• Ability to identify, troubleshoot, and resolve network and connectivity issues efficiently.
• Experience working directly with internet service providers and vendors to install services and resolve outages.
• Experience supporting multiple branch locations and helping ensure reliable network performance.
• Ability to serve as a resource for complex technical issues and provide support to other IT team members when needed.
• Knowledge of backup internet connections and failover systems that help keep locations online during service interruptions.
• Familiarity with cloud-based networking technologies, VoIP phone systems, and network security best practices.
• Experience using IT support, remote monitoring, or technical documentation systems is preferred.
• Industry certifications related to networking or network security are a plus.
• Ability to work independently, stay organized, manage priorities, and communicate effectively with employees, vendors, and business partners.
• Willingness to participate in an on-call rotation and respond to urgent network issues outside normal business hours when needed.

Responsibilities

• Set up, maintain, and update network equipment at branch locations across the country.
• Help keep branch locations connected by managing network and internet systems.
• Troubleshoot and resolve network problems that cannot be handled by the IT Service Desk.
• Support backup internet connections to help branches stay online during outages.
• Monitor network performance and respond to connectivity issues affecting operations.
• Maintain records of network equipment, settings, and diagrams.
• Work with providers and vendors to install services and coordinate upgrades.
• Partner with IT to improve network security and support projects.
• Ensure phone and communication systems perform reliably across branches.
• Track and close work requests in the ticketing system.
• Participate in on-call rotation for urgent issues.

Skills

Firewall administration

SonicWall experience

Networking & security

Multi-site environment

Vendor coordination

IT support & documentation

Education

Bachelor's degree in MIS or CIS

4+ years experience in lieu of education

Tools

SonicWall

Cambium

Aruba

Ubiquiti

Meraki

Job description

CERTEX USA is looking for an experienced Network Administrator in Houston to join our Team. This role maintains and troubleshoots network equipment, ensures reliable connectivity across branch locations nationwide, and collaborates with IT staff to improve performance.

Based in Houston, you will support firewalls, switches, and wireless systems, work with vendors, and participate in an on-call rotation to resolve urgent network issues after hours.