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Technical Specialist - Network SecurityOptus · Macquarie Park, Sydney NSW
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Optus

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Technical Specialist - Network Security

🗓️ Posted 2026-10-09 Macquarie Park, Sydney NSW Full-time Hybrid ICT
💰 Salary Not shared 📊 Market A$7,500–A$11,500/mo

About the Company

Optus is an Australian telecommunications company, delivering more than 11 million services to our customers every day across mobile, broadband and digital solutions. Based in Macquarie Park, Sydney - this role is a senior network security expert responsible for designing, governing, and managing secure network architectures and platforms, while ensuring compliance with security standards and best practices. It involves close collaboration with engineering, cyber security, and operations teams to design and approve secure solutions such as firewalls, segmentation, and encryption technologies. The position also drives security improvements, provides technical leadership and mentorship, and supports risk assessment, incident response, and continuous enhancement of network security. This role requires hands on experience

Responsibilities

  • ● Lead PIR and rep CSE across all problem management related engagements
  • ● Design, implement, and maintain firewall solutions using Fortinet (FW, Proxy, VPN) and Check Point platforms
  • ● Provide Tier 3 technical support to resolve complex and critical network security incidents
  • ● Translate business, security, and network requirements into scalable and secure firewall designs
  • ● Deliver firewall migrations, upgrades, policy optimisation, and high availability implementations
  • ● Apply routing and switching knowledge to interpret network architectures and security traffic flows
  • ● Work closely with Network, Cyber Security, and Operations teams to ensure secure end to end designs
  • ● Perform security assessments, troubleshooting, and root cause analysis for firewall and VPN services
  • ● Contribute basic scripting and automation to improve operational efficiency and repeatability
  • ● Ensure designs align with security standards, best practices, and lifecycle (EOL/EOS) requirements
  • ● Degree in Telecommunications Engineering (or related field) or equivalent experience
  • ● At least 8 years' experience in telecommunications or large enterprise environments, with strong expertise in Fortinet and Checkpoint
  • ● Solid understanding of operational processes, fault management, and diagnosing customer issues
  • ● Proven ability to manage major faults across multiple platforms and communicate effectively with senior stakeholders (up to GM level)
  • ● Experience in testing/PoC environments, including understanding methodologies and platform limitations
  • ● Background in large-scale network design and implementation, with scripting skills (e.g., Python, Perl) as an advantage
  • ● Competitive remuneration and employee discounts. Make life easier (and more affordable) with 80 monthly credit and 25% off Optus products and unique shopping discounts with our retail partners.
  • ● Competitive leave policies, including additional 'Connected' days to focus on culture, family, health, community, or whatever's important to you.
  • ● We support growing families with inclusive, carer-neutral paid Parental Leave of up to 16 weeks.
  • ● Build meaningful connections through employee-led networks and diversity initiatives including Culture Connect, Elevate Women, Disability Network and Express Yourself (LGBTQIA+).
  • ● Put your wellbeing first with free access to counselling and support services, 24/7 - in-person, by phone, SMS, or video.