Senior Software Engineer, Risk

Airwallex; Singapore; On-site; SGD 80,000 - 120,000; Full time

Job summary

Airwallex is seeking an experienced engineer for their Risk Platform Team in Singapore. This role involves designing and developing transaction risk services using Kotlin and Java. Responsibilities include end-to-end delivery of key components, collaborating on technical solutions, and mentoring team members. Candidates should be familiar with distributed systems and modern technologies like machine learning. A commitment to security and an aptitude for problem-solving are essential for this role in a dynamic work environment.

Qualifications

• Experience in designing and developing transaction risk services.
• Ability to mentor engineers through code reviews and design discussions.
• Familiarity with microservice architectures and high-concurrency systems.

Responsibilities

• Design, develop, and operate core transaction risk services.
• Own end-to-end delivery on the microservice framework.
• Build distributed services optimizing performance for production workloads.
• Collaborate on defining technical solutions and improvements.
• Evaluate new technologies aligned with business risk needs.
• Participate in incident response and root-cause analysis.

Skills

Kotlin

Java

Machine learning

Graph technologies

Distributed systems

Job description

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.

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. 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.

Equal Opportunity

Airwallex is proud to be an equal opportunity employer. We value diversity and anyone seeking employment at Airwallex is considered based on merit, qualifications, competence and talent. We don’t regard color, religion, race, national origin, sexual orientation, ancestry, citizenship, sex, marital or family status, disability, gender, or any other legally protected status when making our hiring decisions. If you have a disability or special need that requires accommodation, please let us know.