Technical Specialist - Network Security

Singtel Group; Sydney; On-site; AUD 150,000 - 190,000; Full time

Benefits offered by this job

Competitive remuneration

Employee discounts

Connected days leave

Parental Leave up to 16 weeks

Diversity networks

Counselling services

Job summary

Optus, based in Macquarie Park, Sydney, seeks a senior network security expert to design, govern, and manage secure network architectures while ensuring compliance with security standards. You will collaborate with engineering, cyber security, and operations teams to approve secure solutions including firewalls, segmentation, and encryption technologies.

The role requires hands-on experience and leadership.

Qualifications

• Degree in Telecommunications Engineering or related field.
• 8+ years in telecommunications or large enterprise environments.
• Strong Fortinet and Check Point expertise.

Responsibilities

• Lead design, govern, and manage secure network architectures.
• Design, implement, and maintain firewall solutions using Fortinet and Check Point.
• Provide Tier-3 security support for complex incidents.
• Translate security requirements into scalable firewall designs.
• Deliver migrations, upgrades, and high-availability implementations.
• Collaborate with Network, Cyber Security and Operations teams.
• Perform security assessments and root-cause analysis for firewall/VPN services.
• Contribute scripting to improve operations and repeatability.

Skills

Scripting

Stakeholder communication

Troubleshooting

Network design

Education

Degree in Telecommunications Engineering or related field

Tools

Fortinet

Check Point

VPN

Firewall design

Job description

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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

Your day to day will consist of

• 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

What makes you perfect for the role

• 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

What's in it for you?

• 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.

At Optus, we are strengthened by others and that means valuing diversity and saying 'yes' to embracing individual differences. We are committed to ensuring that our application process provides an equal employment opportunity to all job seekers, including individuals from diverse gender, cultural and linguistic backgrounds, individuals with a disability, individuals identifying as being part of the LGBTQIA+ community, individuals who may have served in the armed forces or who identify as Aboriginal and/or Torres Strait Islander. We also want to do our best to make our recruitment process inclusive. If you require any adjustments or accessibility support to participate fairly and equitably in the recruitment process, please email [e-mail] or call 1800 309 170. We're here to help.