Offensive Security Tester

NBN Co ltd.; City of Melbourne; Hybrid; AUD 120,000 - 180,000; Full time

Benefits offered by this job

Flexible working arrangements

18 weeks parental leave

Diversity & inclusion programs

Job summary

nbn is seeking an Offensive Security Tester in Melbourne to drive penetration testing, threat simulations, and red/purple team engagements across diverse technologies and environments.

You will plan, execute, and communicate testing outcomes with stakeholders, while coaching interns and graduates and contributing to continuous security improvement.

Qualifications

• Minimum certifications in offensive security (Offsec/HTB/SANS) or equivalent.
• Experience planning, executing and communicating technical security assessments.
• Strong analytical thinking and problem-solving abilities.

Responsibilities

• Deliver offensive security testing, threat simulations, and security assessments.
• Lead red and purple team engagements across multiple environments.
• Communicate testing outcomes clearly to technical and non-technical audiences.

Skills

Offensive security

Penetration testing

Security assurance

Stakeholder communication

Automation

Education

Offensive security certs (Offsec/HTB/SANS)

Job description

Job Expectations

Build your career and Australia’s future. Not many people can say they are working on building Australia’s future. With us you’ll be doing just that, leaving a legacy for all Australians. Plus, there’s equal employment, great training, and true flexible working arrangements. A fantastic opportunity has presented itself for an Offensive Security Tester reporting to Manager Ethical Hacking

A bit about your role

This role is responsible for delivering offensive security and technical assurance activities that strengthen nbn’s cyber security posture through penetration testing, threat simulation, red and purple team engagements, and security assessments across a range of technologies and environments. The successful candidate will work collaboratively with internal stakeholders, vendors, and technical teams to plan, execute, and communicate testing outcomes, providing clear, actionable insights to both technical and non-technical audiences. The role requires strong analytical, communication, and stakeholder engagement skills, along with a commitment to continuous learning, adaptability, and professional development. It also contributes to team capability growth through coaching, mentoring, and knowledge sharing with interns and graduate testers.

A bit about you

The ideal candidate will bring strong expertise in offensive security, penetration testing, and security assurance within complex enterprise environments. They will have the ability to plan, execute, and communicate technical security assessments to a range of stakeholders, while balancing multiple priorities and delivering high-quality outcomes. The role requires strong analytical thinking, problem-solving, stakeholder engagement, and communication skills, along with experience in security frameworks, testing methodologies, automation, and emerging technologies. The candidate at a minimum will have industry recognised offensive security certifications from Offsec, HTB or SANS. The successful candidate will be collaborative, adaptable, and committed to continuous learning, with the ability to mentor others, build strong relationships, navigate ambiguity, and contribute to a positive and inclusive team culture.

Life at nbn

To be part of nbn is to be part of something bigger. There’s so much more from here. Our pioneering spirit drives us forward every day. Together, we help lift the digital capability of the nation by building and connecting Australia’s best fibre infrastructure into homes and businesses, plus places and things, everywhere. We’re continuing to create Australia’s network—a network made for more. Not just a way for everyone to do the things we love but transforming the way we do them. A more inclusive working world nbn is committed to an inclusive, flexible, and supportive workplace where everyone can feel heard, valued, and respected. We believe diverse perspectives are the key to unlocking greater outcomes and encourage applications from people of all ages, nationalities, abilities, and cultures. That's why we have a Reconciliation Action Plan, Accessibility & Inclusion Plan, offer 18 weeks of paid parental leave, are a Pride in Diversity Platinum Employer, and have active employee-led diversity pillars.

Equal Opportunities for All

We champion equal opportunities for all employees. If you have any accessibility requirements and would like to discuss adjustments for the recruitment process, please don’t hesitate to contact us by emailing [e-mail] or calling our Recruitment Accessibility Enquiry Line at [phone]. Please note, this line is dedicated to accessibility-related enquiries for the purposes of recruitment, and only enquiries related to accessibility adjustments will be answered. For other matters, please visit our Contact Us page on our website.

Please note that this role is a permanent opportunity and applications will close at midnight on Friday, 23rd October.

To be eligible for this role, you must have full working rights in Australia.

Worker Type Permanent Time Type Full time nbn is the team behind the design, build and operation of the nbn™ network - one of Australia’s largest technology infrastructure projects, which will help better connect Australians with each other and the rest of the world, no matter how you live. But the nbn™ network is so much more than access to fast internet. A state of the art communications network opens up a world of possibilities in areas such as education, business, innovation, healthcare, flexibility, and entertainment. It will help ensure our digital future, and give Australians benefits we can all enjoy, for decades to come.

At nbn, you’ll work with inspirational leaders and innovators in their field, help take on engaging and exciting work, and seek original solutions to new challenges every day. Things move quickly at nbn, and opportunities present themselves all the time. At nbn, you have an incredible chance to broaden your skills and widen your horizons. This is a once in a lifetime opportunity to accelerate your career, and shape your own future, along with Australia’s.