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Senior Security Engineer - Product & Application Security | 12 Month Contract

Summary

Lead threat modelling and security architecture reviews across distributed applications and platforms, partnering closely with engineering to embed security into design and shipping. Core technologies include AWS/GCP, container security, CI/CD pipelines, microservices, and cloud-native architectures.

Are you a Senior Security Engineer with a strong background in product security, application security and threat modelling?

We're partnering with a market leading Australian technology company with a complex, distributed engineering environment operating at genuine scale. Their Cyber Security team is a multi-disciplinary group that partners closely with product and engineering to build security into the way things get designed and shipped, not bolted on afterwards.

They're now looking for a Senior Security Engineer to lead threat modelling and security architecture reviews across their applications and platforms, working hands-on with engineering teams to identify risk and drive practical, scalable mitigation.

This is a highly visible role with executive support behind it. You'll have real influence over the security posture of products used by millions of people.

What You'll Be Doing
  • Leading threat modelling sessions and security architecture reviews for new and existing systems, applications and services
  • Providing expert security guidance to engineering teams during design and development
  • Conducting application, cloud and infrastructure security reviews
  • Building and maintaining reusable threat libraries, security patterns and developer guidance
  • Partnering with engineering to prioritise and remediate security issues across products and services
  • Contributing to security automation initiatives that improve detection, prevention and remediation
  • Supporting Incident Response and Vulnerability Response activities as needed
  • Communicating complex security findings clearly to both technical and non-technical stakeholders
  • Mentoring junior security engineers and contributing to onboarding and team knowledge-sharing
  • Contributing to security champion/training programs, including workshops and training materials
  • Staying ahead of evolving attack techniques and application security trends
What You'll Bring
  • Proven experience leading threat modelling (e.g. STRIDE) and security architecture reviews for complex, distributed systems
  • Strong expertise across Application Security, Cloud Security (AWS/GCP), Container Security, Security Architecture and AI Security
  • Solid grounding in secure software design principles and common application vulnerabilities
  • Experience working in agile engineering environments with CI/CD pipelines, microservices, APIs and cloud-native architectures
  • Demonstrated application of frameworks and standards such as OWASP, MITRE ATT&CK, NIST, ISO 27001 and CIS Controls
  • Excellent stakeholder engagement and communication skills — comfortable translating technical risk into business language
  • Strong analytical and investigative skills, with the initiative to work independently in a fast-paced environment
Nice to have:
  • Experience with security automation or DevSecOps tooling
  • Certifications such as OSCP, CSSLP, CISSP or similar
  • Comfort experimenting with AI tools to enhance security workflows
  • Involvement in bug bounty programs, CTFs, security research, open-source, or speaking at industry events
Why this opportunity?

This is an opportunity to apply your secure design expertise inside a large, complex technology environment with genuine influence over enterprise security practices

You'll work alongside experienced security, engineering and product professionals across a complex technology environment, giving you exposure to modern cloud, application and distributed-system security challenges.

If you're passionate about threat modelling, product security and secure-by-design principles, this is a role where your expertise can have a genuine impact.

Apply now or reach out for a confidential discussion.

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