Senior Network Security Architect - Firewalls & VPN

Singtel Group; Sydney; On-site; Confidential; Full time

Benefits offered by this job

$80 monthly credit

25% off Optus products and retailer/lo

Parental Leave up to 16 weeks

Job summary

Optus is seeking a senior network security expert to design, govern and manage secure architectures across firewall, VPN and encryption technologies. You will collaborate with engineering, cyber security and operations teams to deliver end-to-end secure designs and improvements.

You will lead major fault resolution, provide Tier-3 support and mentor junior staff while ensuring compliance with security standards and lifecycle requirements.

Qualifications

• 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 Check Point.
• 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.

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

Job description

Optus is seeking a senior network security expert to design, govern and manage secure architectures across firewall, VPN and encryption technologies. You will collaborate with engineering, cyber security and operations teams to deliver end-to-end secure designs and improvements.

You will lead major fault resolution, provide Tier-3 support and mentor junior staff while ensuring compliance with security standards and lifecycle requirements.