Senior Fortinet Network Security Engineer role delivering client-facing OT solutions for a major enterprise.
3 days onsite in Mascot.
Senior Fortinet SME role focused on OT and industrial environments
Client-facing consulting position with a major enterprise customer
Clear pathway to permanency with strong career development support
Network Security Engineer – Fortinet SME (OT / Industrial Environments)
Location: Sydney (Mascot)
Hybrid: 3 days onsite
Contract: Initial 6 month contract with view to permanent
Rate: Attractive day rate
About the role
We are seeking a senior Network Security Engineer with strong Fortinet and OT (Operational Technology) experience to join a high-performing professional services team.
You will design and deliver customer-facing network and security solutions for a major enterprise client, with a strong focus on OT and industrial environments.
This role is suited to a senior engineer who is confident in a consulting environment, enjoys working directly with clients, and can translate business requirements into secure, practical network solutions.
Key responsibilities
Deliver customer-facing network and security solutions across enterprise and OT environments
Act as a Fortinet subject matter expert across firewalls and security platforms, including policy, configuration, optimisation and upgrades
Engage directly with clients to understand business needs and translate them into technical designs and implementation plansSupport and enhance network and security services within OT environments such as industrial sites, critical infrastructure, manufacturing and utilities
Lead and contribute to project delivery including migrations, upgrades, hardening and network segmentation
Collaborate with senior engineers,



architects and business stakeholders to define and embed best practice for Fortinet and OT security
Produce transparent documentation, design artefacts, runbooks and standards for both OT and IT network environments
About you
Strong hands‐on experience with Fortinet firewalls and security solutions such as FortiGate (FortiManager and FortiAnalyzer experience highly regarded)
Proven experience in a consultancy or skilled services environment in a client‐facing role
Comfortable presenting to and working with both technical and non‐technical stakeholders
Experience designing, supporting or securing OT and industrial networks (for example SCADA, PLC, ICSEnvironments)
Solid understanding of core routing and switching concepts, with Cisco experience highly regarded
Background working in enterprise or critical infrastructure environments
Strong understanding of network security principles including segmentation, remote access, VPNs, IDS/IPS and hardening
Motivated to stay current with Fortinet and OT security best practices and pursue certifications such as Fortinet NSE and Cisco or security-focused certifications
About the company
You will be joining a consultancy of around 130 people delivering major network and security projects and professional services engagements for blue‐chip clients.
The business is founded and led by two highly respected veterans of the Australian network and security community, known for deep technical capability and a collaborative, supportive culture.
What's on offer
Senior role with a clear pathway to permanency
Opportunity to operate as a Fortinet SME in complex OT and enterprise environments
Direct exposure to industry leaders in the Australian network and security space
Support for training and certifications across Fortinet, Cisco and broader security
Work on modern, large-scale enterprise and OT environments with real‐world impact
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📌 Senior Network Engineer (Fortinet Sme) (Sydney)
🏢 Mode Talent
📍 Sydney