Senior Incident Responder

Singtel Group; Sydney; Hybrid; AUD 150,000 - 210,000; Full time

Benefits offered by this job

Competitive remuneration

Flexible hybrid/work arrangement

On-site campus facilities

Parental Leave support

Employee discounts

Job summary

Optus is seeking a Senior Incident Responder to join its Cyber Defence Operations team in a pivotal role defending a large and complex technology environment. You will lead major incident responses, coordinate containment and recovery, and supervise forensic investigations across hybrid cloud environments.

You will communicate clearly with leadership and legal teams, mentor junior responders, and drive improvements in playbooks, tooling, and readiness exercises.

Qualifications

• Extensive experience in cyber incident response and digital forensics.
• Proven ability to lead major cyber security incidents with multiple stakeholders.
• Deep expertise across endpoints, memory, networks, identities, and cloud platforms.
• Experience using SIEM/XDR/EDR and log analysis for investigations.
• Strong scripting and analytical capabilities to support investigations.

Responsibilities

• Lead response to major cyber security incidents as incident commander.
• Direct containment, eradication, and recovery activities across teams.
• Perform advanced digital forensics across host, memory, network, identity and cloud.
• Own communications with leadership, legal, and business stakeholders during incidents.
• Act as escalation point for senior incident responders on high-impact events.
• Drive continuous improvement of IR tooling, playbooks, and processes.
• Participate in 24x7 on-call roster for high-priority incidents.

Skills

Cyber incident response

Digital forensics

Security operations

Scripting/automation

Communication with leadership

Leadership under pressure

Education

GCFA

GREM

GNFA

GCIH

Tools

SIEM

XDR

EDR

Log analysis tools

Job description

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Optus is a leading Telecommunications company known for delivering innovative solutions to its customers, disrupting the industry, and evolving as a technology company with a diverse portfolio of products and services. As cyber threats continue to evolve, protecting our customers, people, and business remains a critical priority.

We're looking for a Senior Incident Responder to join our Cyber Defence Operations team. This is an exceptional opportunity to play a leading role in defending one of Australia's largest and most complex technology environments, driving incident response outcomes and enhancing our cyber resilience.

What You'll Do

Partnering closely with the Director, Incident Response & Readiness and key stakeholders across Optus, you will be responsible for:

• Leading the response to major cyber security incidents, acting as incident commander across complex, multi-team investigations and recovery efforts.
• Directing containment, eradication, and recovery activities while ensuring clear coordination across technical teams and business stakeholders.
• Performing advanced digital forensic investigations across host, memory, network, identity, and cloud environments.
• Owning communications throughout significant incidents, providing clear and actionable updates to leadership, legal, and impacted business teams.
• Acting as the primary escalation point for Incident Responders on complex, sensitive, or high-impact security events.
• Maintaining investigative excellence by reviewing casework, forensic methodologies, and evidence handling practices.
• Leading cyber readiness activities, including simulation exercises, incident reviews, and capability uplift initiatives.
• Driving continuous improvement across incident response tooling, automation, procedures, and playbooks.
• Participating in the 24x7 on-call roster as a senior escalation point and incident commander for high-priority events.

What You'll Bring

• Extensive experience in cyber incident response, digital forensics, and security operations within large or complex environments.
• Proven experience leading or commanding major cyber security incidents involving multiple stakeholders and technical domains.
• Deep expertise in forensic investigations across endpoints, memory, networks, identities, and cloud platforms.
• Strong understanding of evidence handling, investigative methodologies, and regulatory or legal requirements.
• Experience using SIEM, XDR, EDR, and log analysis tools to investigate and respond to sophisticated threats.
• Strong scripting and analytical capabilities to support large-scale investigations and threat analysis.
• Excellent communication skills with the ability to engage technical teams, executives, legal stakeholders, and external partners.
• Calm, decisive leadership under pressure and a track record of delivering successful outcomes during high-impact incidents.
• Relevant qualifications in Cyber Security, Digital Forensics, Computer Science, or a related discipline. Industry certifications such as GCFA, GREM, GNFA, or GCIH will be highly regarded.

The Good Stuff...

• 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.
• Flexible working arrangements with opportunities to work three days in the office, two days remote or home.
• Vibrant and collaborative office campus that includes cafes, convenience store, chill out zones, GP, post office, gym and on-site childcare centre.
• 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.
• Direct your own development and build future-ready skills with Optus U's industry-focused micro-credentials, developed with La Trobe and Macquarie Universities.
• 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.

If you require 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.