Senior Software Engineer, Risk

About Airwallex

Airwallex is the AI-native financial operating system for a real-time, intelligent economy. More than 675,000 businesses, including McLaren Racing, Qantas, SHEIN, and TikTok, use us, directly or through our platform partners, to run their financial operations or build and monetize financial products of their own.

We started in Melbourne in 2015 to build the infrastructure global commerce runs on. We're the regulated backbone behind global payments: not by accident, but by design. A decade plus, 85+ licenses, and a financial infrastructure spanning North America, Europe, the Middle East, and Asia-Pacific.

We're co-headquartered in San Francisco and Singapore, with more than 2,300 people across 27 offices. We hire builders with founder-level energy, people who move fast with good judgment, dig in with real curiosity, and make calls from first principles rather than waiting to be told what to do. Read our operating principles to see it in full.

How you'll make impact

You’ll build and enhance Airwallex’s payment products and transaction systems using Java or Kotlin. You’ll design and develop components on our microservice framework, with a focus on scalable and reliable services. You’ll improve the systems that protect Airwallex’s products and services, using technologies such as graph databases, machine learning and LLMs to support risk management.

• Drive architectural improvements across distributed, high-concurrency systems by experimenting with new technologies and applying sound engineering judgment.

• Improve the reliability and scalability of payment products, transaction systems and risk-management capabilities.

• Build services that support the detection and mitigation of evolving fraud risks across Airwallex’s products.

• Partner with senior engineers to raise software engineering practices and coding standards.

• Mentor less-experienced engineers and help strengthen the team’s technical capability.

You'll be in our Singapore office five days a week.

What we're looking for

Essentials

• More than four years of core Java development experience and more than five years of experience building internet applications, large financial systems or e-commerce platforms.

• More than three years of experience developing risk or payment platforms.

• A bachelor’s degree in computer science or a related discipline.

• Strong proficiency in Java, including Java multithreading, high concurrency, I/O, NIO and network communication.

• Experience with common design patterns and the design and development of large-scale, distributed, high-concurrency, high-load and highly available systems.

• Strong knowledge of server technologies, including service-response and data-query optimisation, service quality and high-concurrency and high-availability problem solving.

• Familiarity with Spring, Spring Boot and RESTful services.

• Experience with Gradle, Maven or other build tools.

• Familiarity with JSON and XML.

Preferred

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