senior security engineer.

I am working with a leading tech-driven organisation that powers one of Australia’s most recognisable digital platforms. They are looking for a Senior Security Engineer with strong expertise in threat modelling, secure design, and cloud security (AWS) to join the team on a contract through to 30 June 2026.

You’ll work closely with product, engineering, and security teams to uplift secure design practices across complex, modern distributed systems. This role is suited to someone who is highly technical, cooperative, and confident facilitating discussions and guiding teams through secure software development.

In this position, you will:

• Lead and document application threat models across products and platforms

• Build reusable threat modelling templates, frameworks, and guidance

• Embed security-by-design and SSDLC practices into engineering workflows

• Provide application, cloud and infrastructure security advice during design, architecture reviews, and development cycles

• Conduct security assessments across data flows, APIs, microservices, and cloud-native systems

• Contribute to security documentation, training materials, and uplift activities for engineering teams

• Work with both product security and cloud security teams on BAU and proactive reviews

You’ll be successful in this role if you bring:

• 5+ years in application or product security engineering

• Strong expertise in threat modelling (e.g., STRIDE) and secure architecture reviews

• Deep knowledge of secure development lifecycle and DevSecOps practices

• Ability to assess and communicate security risks in complex distributed systems

• Strong experience with AWS security, cloud-native environments, and container security

• Familiarity with frameworks such as OWASP, MITRE ATT&CK, NIST, ISO 27001

• Excellent communication skills and stakeholder engagement experience

• Ability to guide engineers without owning business-risk decisions

This opportunity gives you the chance to apply secure design principles at scale within a high-impact digital environment serving millions of users. You’ll have direct influence over security architecture and uplift initiatives across a sophisticated engineering organisation.

• Contract to: 30 June 2026 (with potential extension)

• Hybrid: 2–3 days in office

• Start: ASAP

At Randstad Digital, we are passionate about providing equal employment opportunities and embracing diversity to the benefit of all. We actively encourage applications from any background.