Senior Software Engineer, Transaction 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 2,200 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. ATTRIBUTES WE VALUE 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 https://www.airwallex.com/us/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 Airwallex Risk Platform Team is responsible for protecting all Airwallex products across the lifecycle, including GTPN, PA, Issuing, Onboarding, and Account Takeover. The risk landscape evolves rapidly and fraud techniques are becoming increasingly sophisticated. We build scalable, reliable, and intelligent risk capabilities to stay ahead—helping Airwallex remain a trusted global partner for businesses. Our team is distributed across Shanghai and Singapore, working closely with global product, engineering, data, and operations teams, as well as external partners and customers, to deliver a holistic risk management approach. This role is based in Singapore. WHAT YOU’LL DO Our mission is to keep Airwallex’s products and services safe and secure. We continuously improve risk strategies and systems using modern technologies, including graph, machine learning, and LLMs/Gen AI, to detect and prevent fraud and abuse at scale. RESPONSIBILITIES: - Design, develop, and operate core transaction risk services and infrastructure using Kotlin/Java, supporting payment products and transaction systems. - Own end-to-end delivery of key components and services on Airwallex’s microservice framework: design, implementation, testing, deployment, and observability. - Build high-concurrency, highly available distributed services, optimizing latency, throughput, and reliability for production workloads. - Collaborate with senior engineers and cross-functional partners to define technical solutions, APIs, and service boundaries; drive architectural improvements. - Explore and evaluate new technologies (e.g., graph/streaming/ML/LLM related) and propose pragmatic upgrades aligned with business risk needs. - Mentor engineers through code reviews, design discussions, and engineering best practices, improving team quality and delivery efficiency. - Participate in on-call/incident response when needed, driving root-cause analysis and long-term remediation. APPLICANT SAFETY POLICY: FRAUD AND THIRD-PARTY RECRUITERS To protect you from recruitment scams, please be aware that Airwallex will not ask for bank details, sensitive ID numbers (i.e. passport), or any form of payment during the application or interview process. All off