Cyber Defence Engineer

Senior Security Analyst – Cyber Defence Operations

Optus is a leading Telecommunications company known for delivering innovative solutions, disrupting the industry, and evolving into a technology-driven organisation with a diverse portfolio of products and services. With a strong commitment to excellence and a customer-first mindset, we continue to push the boundaries of cyber security to protect our customers, platforms, and data.

As part of our Cyber Defence Operations (CDO) team, you’ll play a critical role in strengthening our detection and response capabilities, helping safeguard one of Australia’s largest digital ecosystems.

Due to the nature of the role and environment in Optus Security & Risk, we are ideally seeking candidates who hold Australian Citizenship and current have or are wiling to obtain Security Clearance.

What You’ll Do

Partnering closely with the Senior Director of Adversary Disruption and internal stakeholders across Security, Technology, and Business units, you will be responsible for:

• Leading the response to complex and high-severity cyber security incidents, coordinating cross-functional teams and managing the end-to-end lifecycle of incident response

• Designing and executing threat hunting programmes, translating intelligence into actionable detections and control improvements

• Owning detection coverage and risk mapping aligned to MITRE ATT&CK, identifying gaps and driving prioritised uplift initiatives

• Producing high-quality incident reports, including root cause analysis, timeline reconstruction, and remediation recommendations

• Acting as a technical escalation point and mentor for junior analysts, uplifting investigation quality and capability across the team

• Driving continuous improvement in detection and response operations, including tooling optimisation and process enhancements

• Maintaining and evolving incident response playbooks and procedures to reflect current threats and technologies

• Providing concise and insightful reporting on incident trends, emerging threats, and operational performance to leadership

What You’ll Bring

• Demonstrated experience in cyber security incident response, with the ability to independently manage complex, multi-vector incidents

• Strong expertise in threat hunting, detection engineering, and security operations within enterprise or critical infrastructure environments

• Advanced analytical and investigative skills, with the ability to make sound decisions under pressure and with incomplete data

• Hands-on experience with SIEM, EDR/XDR, and cloud security platforms for detection and response

• Excellent written and verbal communication skills, with the ability to translate technical findings into executive-ready insights

• Proven experience mentoring and developing junior talent, contributing to team capability uplift

• Strong stakeholder engagement skills, with the ability to collaborate across technical and non-technical teams

The Good Stuff...

• Competitive remuneration and employee benefits, including discounts on Optus products and services

• Flexible working arrangements, supporting a hybrid work model

• Access to a vibrant and collaborative workplace environment with premium on-site facilities

• Inclusive parental leave and family-friendly policies

• Continuous learning opportunities through Optus U and industry-recognised certifications

• Employee-led networks and diversity initiatives that celebrate individuality and inclusion

• 24/7 wellbeing support, including counselling and mental health services

At Optus, we are strengthened by diversity and committed to creating an inclusive workplace where everyone can thrive. We welcome applications from individuals of all backgrounds, including Aboriginal and Torres Strait Islander peoples, people with disability, and members of the LGBTQIA+ community.

If you require adjustments or accessibility support during the recruitment process, please let us know—we’re here to help.