Senior Security Engineer, Insider Risk

About Airwallex

Airwallex is the only unified payments and financial platform for global businesses. Powered by our unique combination of proprietary infrastructure and software, we empower over 200,000 businesses worldwide – including Brex, Rippling, Navan, Qantas, SHEIN and many more – with fully integrated solutions to manage everything from business accounts, payments, spend management and treasury, to embedded finance at a global scale.

Proudly founded in Melbourne, we have a team of over 2,000 of the brightest and most innovative people in tech across 26 offices around the globe. Valued at US $8 billion and backed by world-leading investors including T. Rowe Price, Visa, Mastercard, Robinhood Ventures, Sequoia, Salesforce Ventures, DST Global, and Lone Pine Capital, Airwallex is leading the charge in building the global payments and financial platform of the future.

If you’re ready to do the most ambitious work of your career, join us.

We hire successful builders with founder-like energy who want real impact, accelerated learning, and true ownership. You bring strong role-related expertise and sharp thinking, and you’re motivated by our mission and operating principles. You move fast with good judgment, dig deep with curiosity, and make decisions from first principles, balancing speed and rigor.

You’re humble and collaborative; turn zero‑to‑one ideas into real products, and you “get stuff done” end-to-end. You use AI to work smarter and solve problems faster. Here, you’ll tackle complex, high‑visibility problems with exceptional teammates and grow your career as we build the future of global banking. If that sounds like you, let’s build what’s next.

About the team

The Airwallex Information Security Team is a high calibre and highly proactive team that works across our infrastructure, applications, corporate IT and broader engineering functions.

What you’ll do

As a Senior Security Engineer focused on insider and fraud threats within the Information Security Engineering team, you will be pivotal in protecting Airwallex’s $200b+ payments ecosystem, our customers, and our global workforce. Your mandate centers on identifying, investigating, and challenging threats from both internal and external actors. You will be challenged to:

• Design, develop, and maintain advanced detection rules and automated response mechanisms to surface insider and fraud risk, using a mix of behavioral analytics, anomaly detection, and rule-based logic.

• Deep-dive into user, system, and financial data to uncover complex fraud tactics and potential abuse by insiders or privileged users.

• Contribute insight into evolving fraud trends and trusted insider behaviors, strengthening Airwallex’s proactive security stance through continuous learning and agile solutioning.

• Mentor peers on advanced detection strategies, fraud taxonomy development, and the broader fraud/insider threat lifecycle, fostering technical depth on the team.

Responsibilities

• Lead the creation and tuning of high-efficacy detection signatures and analytics across SIEM, EDR, DLP, and payment monitoring platforms, focusing on both technical threats and nuanced abuse scenarios.

• Support relevant incident response and digital forensics efforts.

• Identify and mitigate the risk of issues such as account misuse, privilege escalation, and social engineering within the organization.

• Collaborate with fraud analysts, KYC operations, compliance, and the broader security team to improve high-risk workflows (onboarding, KYC,authentication, funds movement).

• Create, maintain, and operationalize detection logic for insider and fraud scenarios.

• Share domain best practices in threat modeling and detection with the engineering team, actively supporting others’ development in fraud and insider risk domains.

Who you are

You have a proven passion for detecting and responding to sophisticated fraud and insider threats in a Fintech or technology-driven environment. You are outcome-driven, relentless in your pursuit of root causes, and thrive when blending technical acumen with creative threat modeling. You are:

• Intellectually curious, especially about insider threat frameworks,…