L3 Senior Network Engineer

Infotrust (AU); Sydney; Hybrid; AUD 120,000 - 160,000; Full time

Job summary

Infotrust is seeking a capable L3 Senior Network Engineer in Australia to resolve complex network incidents, manage operational tooling, and deliver billable technical work including projects. The role ranges from experienced L3 engineers to senior L2 ready for advancement, with hybrid work and cross-environment exposure.

Responsibilities include coordinating outages, configuring VLANs, VPNs, firewalls and SD-WAN, and guiding L1/L2 teams while upholding ITIL practices and security standards.

Qualifications

• 3–5 years’ experience in similar technical support or engineering roles.
• Strong networking knowledge across routing, switching, VLANs, VPNs, firewalls, and SD-WAN.
• Familiar with ITIL processes: incident, problem and change management.
• Experience with hybrid and cloud-connected environments, incl. Azure networking.

Responsibilities

• Resolve complex network incidents and escalated service requests.
• Configure VLANs, subnets, firewalls, wireless, and SD-WAN changes.
• Deliver technical project work, onboarding, and transition to support.
• Provide guidance to strengthen L1/L2 team capability.
• Manage network outages and coordinate with ISPs and vendors to restore services.
• Maintain monitoring, management, backup, security and service delivery platforms.
• Identify root causes of recurring issues and implement long-term solutions.
• Adhere to security, documentation and change management requirements.
• Contribute to continuous improvement across tools, systems and processes.
• Build strong relationships with customers and internal stakeholders.

Skills

Routing & Switching

VLANs

VPNs

Firewalls

Wireless

SD-WAN

TCP/IP

DNS/DHCP

Azure networking

Tools

Cisco

Cisco Meraki

Fortinet

Aruba

Job description

Infotrust is a trusted Australian provider of cyber-first technology and security services, supporting organisations of all sizes across the country. With over 250 professionals and full national coverage, we deliver industry recognised solutions across both private and public sectors.

Our integrated offering combines secure-by-design managed IT with advanced cyber capabilities, including Offensive and Defensive Security, Governance, Risk & Compliance (GRC), and Strategic Technology Advisory. These services are anchored by our Australian-based 24/7 Security Operations Centre (SOC) and a specialised Digital Forensics and Incident Response (DFIR) team.

The Role

As the L3 Senior Network Engineer, you are accountable for resolving incidents requiring strong technical expertise, managing operational tooling that enables service delivery, systematically building lower-tier capability to reduce escalation dependency, and delivering billable technical work including project assignments and specialist service requests. The role exists to address issues beyond L2 scope, maintain platform stability, uplift capability through the support tiers, and contribute technical expertise to client onboarding and projects.

This is an excellent opportunity for either an experienced L3 Engineer or a senior L2 Engineer ready to step into the next stage of their career while gaining exposure to a broad range of customer environments.

Key Responsibilities

• Resolve complex network incidents and escalated service requests across customer environments.
• Perform network administration tasks such as VLAN, subnet, firewall, wireless, and SD-WAN configuration changes.
• Deliver technical project work, including implementation, customer onboarding, and transition to support.
• Provide technical guidance and knowledge sharing to strengthen L1 and L2 team capability.
• Manage network outages and coordinate with ISPs and vendors to restore services.
• Maintain the stability and effective operation of monitoring, management, backup, security, and service delivery platforms.
• Identify root causes of recurring issues and implement long-term solutions to improve service reliability.
• Assess and implement changes in line with security, documentation, and change management requirements.
• Contribute to continuous improvement initiatives across tools, systems, processes, and customer service delivery.
• Maintain current technical knowledge and build strong relationships with customers, vendors, and internal stakeholders.

Skills & Experience

• 3–5 years’ experience in similar technical support or engineering roles.
• Strong networking capability across routing, switching, VLANs, VPNs, firewalls, wireless, SD-WAN, TCP/IP, DNS and DHCP.
• Good understanding of ITIL and experience with incident, problem and change management.
• Demonstrated experience troubleshooting network connectivity, performance and availability issues across customer environments.
• Hands‑on experience with enterprise and mid‑market networking technologies such as Cisco, Cisco Meraki, Fortinet, Aruba or equivalent.
• Confident working with technology vendors to resolve complex technical issues.
• Experience supporting hybrid and cloud-connected environments, including Azure networking, site‑to‑site connectivity and cloud network services.
• ITIL 4 Foundation certification, or a willingness to obtain it.
• Security or vendor-specific certifications are desirable but not essential.

With hybrid working, workplace flexibility and a strong focus on professional development, Infotrust provides an environment where you can broaden your experience, build your capability and make a meaningful contribution to the business and our customers.