Senior Security Engineer - Firewall Security

As a Senior Security Engineer in Telstra’s Security Engineering team, you’ll help shape and protect the future of our technology environment. You’ll design and implement security controls across our DevOps pipelines, cloud infrastructure, and enterprise networks, ensuring security is embedded at every layer.

You’ll work hands-on in a fast-paced Agile environment alongside engineering and DevOps teams to assess and reduce risk across our platforms. This role blends technical depth with strategic influence — ideal for someone who thrives on solving complex challenges and improving security at scale.

As a trusted advisor, you'll contribute to secure design and implementation while helping uplift security practices and shape Telstra’s overall security capability.

What You’ll Do

• Partner with engineering and platform teams to embed security into solution design and delivery lifecycles.
• Lead the implementation of security controls within cloud, DevOps, and network environments.
• Provide technical consulting and design input across security and network platforms.
• Support deployments and changes — including some flexibility for after-hours work as required.
• Operate as a subject matter expert, working autonomously and collaboratively within an Agile team.
• Contribute to the evaluation and integration of emerging technologies, tools, and best practices.

What you bring

You’re a seasoned Security Engineer or Network Security Specialist with experience supporting enterprise-scale environments. You’re technically strong, a great communicator, and enjoy working across teams to embed secure solutions.

We’d love to see:

• 5–8+ years of experience in network security, cloud security, or infrastructure security roles.
• Strong experience with one or more major firewall platforms (e.g. Palo Alto, Cisco FTD, Juniper, Checkpoint).
• Solid hands-on skills in routing & switching (e.g. OSPF, BGP, VLANs, port channels, VRFs).
• Familiarity with cloud environments (e.g. AWS, Azure) and CI/CD or DevOps security practices.
• Experience working in Agile environments and collaborating across multidisciplinary teams.
• Degree in Computer Science, Engineering, or a related field (or equivalent experience).

Nice to have (but not required):

• Exposure to SR-MPLS or carrier-grade networking.
• Certifications such as CISSP, CISM, CCNP Security, or similar.
• Experience with automation tools (Terraform, Ansible) or scripting for security use cases.

Why Telstra?

• Flexible work – balance your work and life with hybrid and remote options.
• 16 weeks paid parental leave – for both primary and secondary carers.
• Free Telstra mobile plan – stay connected on us.
• Device allowance – refreshed every 2 years.
• Discounts – on Telstra products and partner services.
• Professional development – ongoing opportunities to grow and upskill.
• Purchased annual leave – more time when you need it.

If this sounds like the opportunity for you, we’d love to hear from you. Apply now and help secure the future of Australia’s largest telco. We’re committed to building a diverse and inclusive workforce in all its forms. We strongly encourage applications from people of all backgrounds, including those from diverse gender, cultural and linguistic communities, and individuals living with a disability.

To learn more about how we support our people, including accessibility adjustments during the recruitment process, visit: tel.st/thrive