Security Engineer
Confirmed on the employer's own hiring board on Oct 8, 2026. First seen by Alion on Aug 24, 2026. Downer Group scores B on the Alion truth index.
Join our Downer Professional Services team and play a key role in delivering complex defence and national security projects that safeguard Australia’s future.
Downer Professional Services comprises of three business units our Technical, Advisory, and Capability consulting practice, and Team Downer, which partners with CASG and NSSG as a major service provider to Defence. Together, we are a multi-disciplinary advisory and delivery partner of choice for clients across Defence and National Security.
We currently have an opportunity for a Security Engineer in Canberra to work on various projects.
What You’ll Do
This role offers a broad scope, with key role responsibilities including:
Support security accreditation and assurance activities for current and future product releases, including the preparation and maintenance of security accreditation artefacts, risk assessments, and assurance evidence.
Liaise with Defence, ASD, DCIAB, intelligence agencies, and other stakeholders regarding security issues, accreditation activities, threat assessments, and compliance requirements.
Develop, maintain, and review Security Management Plans, System Security Plans (SSP), security operating procedures, and associated security documentation.
Conduct security risk, threat, and vulnerability assessments to identify security weaknesses and develop mitigation strategies consistent with Defence risk management practices.
- Provide specialist security engineering support to technical support, sustainment, and project teams regarding security design, implementation, configuration, and remediation activities.
- Maintain security documentation and artefacts to support audits, accreditation reviews, governance activities, and ongoing assurance.
What You’ll Bring
Bachelor's degree or equivalent in Information Technology, Computer Science, Computer Engineering or a related discipline.
Advanced knowledge and experience in security including understanding of gateways and cross domain solutions.
Demonstrated experience in reviewing engineering and technical documentation for security compliance.
Strong stakeholder engagement across Defence and other government agencies.
Experience in security accreditation and assurance activities.
Understanding of Defence Security Principles including DSPF, PSPF, DSPM, and ISM
Due to the nature of the work, you are required to currently hold and maintain an AGSVA Security clearance as required by the Commonwealth. In some instances, compliance with International Traffic in Arms Regulations (ITAR) requirements may also be an inherent requirement.
More than anything, you’ll bring a strong work ethic, a positive attitude, and a commitment to delivering high-quality outcomes for our clients.
Why Downer Professional Services
At Downer Professional Services, we’re not just a workplace - we’re a business dedicated to contributing to the shaping of the future of defence in Australia. As the country’s only sovereign prime, we’re committed to making a real difference in protecting Australia’s interests.
What is means to belong at Downer Professional Services
Meaningful work: Help to deliver critical Defence projects that protect Australia and shape its future.
Professional development: Access career mapping, accelerated learning programs, and shared learning through our Communities of Practice.
Great perks: Enjoy discounts on healthcare, retail, vehicles, and more through Perks@Downer.
Veteran support: Benefit from initiatives like up to 20 days of Reservist Leave to stay connected post-service.
You want your work to matter and so do we. With over 26,000 people across Australia, New Zealand and the Pacific, our team is made up of individuals with unique perspectives, backgrounds, and ideas.
We know that diversity makes us stronger and we actively celebrate it through our commitment to inclusion and belonging.
We’re committed to building a team that reflects the diverse communities we serveand we welcome people of all ages, genders, sexual orientations, cultures, abilities, and lived experiences. We especially encourage applications from those whose voices have traditionally been underrepresented in our industry, including women, Aboriginal and Torres Strait Islander Peoples, Māori and Pasifika Peoples, veterans, people with disability, and neurodivergent individuals. Even if your experience doesn’t align perfectly with this role, we’d still like to hear from you. If it feels like the right fit, apply - potential counts, and so do you.
As a WORK180 Endorsed Employer, we support flexibility that works for your life, inclusive leadership that values your voice, and equitable access to opportunity so you can do your best work and bring your whole self to it.
If you need support or adjustments through the recruitment process, just let us know, we’re here to help you put your best foot forward.