Principal Security Architect

Australia Post Group; City of Melbourne; Hybrid; AUD 150,000 - 210,000; Full time

Benefits offered by this job

Flexible hybrid working

Team discounts

Health & wellbeing resources

Job summary

Australia Post is seeking a Principal Security Architect to lead security architecture across a complex technology landscape. You will set strategic direction, shape reference architectures and partner with engineering, delivery and executives to secure solutions at scale.

You will drive AI-first security approaches, threat modelling, and automated assurance, while supporting major transformation programs and critical cyber capabilities across the enterprise.

Qualifications

• Senior security architect with cross-domain expertise and strategic influence.
• Experience designing secure solutions and architecture patterns across complex tech landscapes.
• Automation and AI-enabled security practices are highly regarded.

Responsibilities

• Own security target state, roadmap, patterns, standards and reference architectures.
• Provide hands-on security architecture and assurance for programs and platforms.
• Drive AI-first and automated threat modelling, policy-as-code and architecture-as-code.

Skills

Security architecture

Threat modelling

AI security

Zero trust

Cloud security

Job description

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Name

Principal Security Architect

Site / Location

Ref #

12388779

Entity

Australia Post

Opening Date

02-Oct-2026

Suburb

Work Type

Permanent Full Time

Description & Requirements

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Working in tech at Australia Post is where innovation and problem solving meets great people and agile working. You’ll work with bright people on building and maintaining products and services that you and every other Australian get to benefit from every day. Whether you’re working from our modern office or your one at home, you’ll be part of a culture of collaboration and connection, making long-lasting impact right across Australia.
About the opportunity
Help shape the future of cyber security at one of Australia’s most trusted brands. As aPrincipal Architect - Security, you will be a senior technical leader within Australia Post’s Enterprise Security Architecture team, responsible for setting the strategic direction for security architecture across a complex and evolving technology landscape. Reporting to the Senior Manager, Enterprise Security Architecture, you will partner with engineering, delivery and executive stakeholders to design secure solutions, influence enterprise technology decisions and strengthen cyber resilience at scale. This is a unique opportunity to combine deep technical expertise with strategic influence, helping drive an AI-first approach to security architecture while supporting major transformation programs, modern platforms and critical cyber security capabilities across the enterprise.
What you’ll deliver with us
Commercial & Strategic Priorities

• Own the security target state, roadmap, patterns, standards and reference architectures for the assigned area of focus, aligned to the Enterprise Security Architecture strategy, Post 30, and the E&TA and Cyber Security strategies.
• Provide hands-on security architecture and assurance for programs, portfolios and platform teams: engaging early, leading threat modelling and articulating residual risk clearly to enable informed decisions.
• Act as security design authority for enterprise security capabilities, partnering with Cyber Defence, Application Security and Identity Engineering on tooling architecture and roadmaps, and turning penetration testing, threat intelligence and incident insights into architectural remediation.
• Drive AI-first and automated ways of working, including AI-assisted solution review, automated threat modelling, policy-as-code and architecture-as-code.
• Represent security architecture in enterprise governance forums (e.g. ARB, Engineering Council, AGF) and the architecture ELT, and provide cover and peer review across other Principal areas of focus.
• Reduce delivery cost and rework by driving reuse of validated security patterns and automated assurance across programs and platforms.
• Provide risk-informed trade-off analysis to inform investment prioritisation and business cases within the assigned area of focus.
• Contribute to the rationalisation of security tooling and licensing by identifying duplicated capabilities and consolidation opportunities.

About you
You are a highly skilled security architect with deep expertise across multiple security domains and a passion for enabling secure business outcomes at scale. You combine strong technical capability with a pragmatic approach to risk, bringing experience designing secure solutions, developing architecture patterns and guiding major transformation initiatives across complex technology environments.

You have a strong understanding of modern security architecture principles, including zero trust, secure-by-design, cloud and AI security, and stay current with the evolving threat landscape, emerging technologies and regulatory requirements. Comfortable operating from the engineering floor to the executive table, you can clearly communicate technical risk, influence critical decisions and build trusted relationships across diverse stakeholder groups. Experience with automation, AI-enabled security practices and enterprise-scale architecture assurance will be highly regarded, as will exposure to critical infrastructure, logistics or operational technology environments.
What else is in it for you?

• Bring your whole self to work every day and be met by a welcoming bunch of people who respect and support you
• Flexible and hybrid working arrangements, like the opportunity to work from home two days per week
• Opportunities for growth and development through formal programs or mentorship
• Exclusive team member discounts and offers for more cash in your pocket, evolving policies for flexible working, leave types and access to health and wellbeing resources

All walks, one route

It takes a lot of us to deliver for every Australian – and it’s important to us that our people behind the parcels reflect the people receiving them. We come from all walks. Different backgrounds, different ages, different genders, different sexualities and different abilities, but we all believe in the same purpose.

We welcome people all ages, genders and backgrounds – including Aboriginal and Torres Strait Islander peoples, people with disability, LGBTQIA+ communities, and refugees. We’re a Disability Confident Recruiter, committed to making our hiring process and workplace inclusive and barrier-free. We’re also working hard to remove bias and build a gender-equitable experience for everyone who joins us. If you’ve got questions about accessibility, reach out to our Diversity & Inclusion team at [e-mail] or on 03 8737 9415.

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