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 150,000 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 1,700 of the brightest and most innovative people in tech across 26 offices around the globe. Valued at US$6.2 billion and backed by world-leading investors including Visa, Airtree, Blackbird, Sequoia, DST Global, Greenoaks, Salesforce Ventures, Lone Pine, and Square Peg, 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.

About the team

The Engineering team at Airwallex is a diverse group of innovators, builders, and problem solvers, driven by a mission to empower businesses to operate anywhere, anytime. We thrive in a collaborative and fast-paced environment, where we're constantly pushing the boundaries of what's possible in the financial technology space. As a team, we value technical craftsmanship, continuous learning, and a strong sense of ownership, working together to build scalable, reliable, and secure products that empower businesses of all sizes to grow without borders.

The Cards team at Airwallex builds and maintains distributed systems that enable businesses to issue debit cards and manage expenses at scale. The team addresses complex requirements around compliance, security, and the evolving needs of global users—supporting millions of seamless card transactions and ensuring robust, reliable expense management solutions for companies worldwide.

What You’ll Do

As a Senior Engineer on the Cards team, you will design and build scalable backend systems that power our card issuance and expense management products. You’ll collaborate with cross-functional teams to deliver reliable, secure features while mentoring engineers and influencing the technical direction of the platform.

This role is based in Singapore.

Responsibilities

• Design and implement scalable, secure backend services that power the Cards product
• Contribute to the architecture and long-term technical vision of our backend systems
• Own end-to-end delivery of new features and improvements—from design to production
• Write high-quality, testable code with attention to reliability and maintainability
• Promote and uphold engineering best practices, including observability and API design
• Collaborate with cross-functional teams including product, infrastructure, and design
• Provide technical mentorship and support the growth of other engineers on the team

• Bachelor’s degree in Computer Science, Software Engineering, or a related field
• 5+ years of professional software engineering experience
• Hands-on experience designing and building backend systems and APIs in production
• Strong computer science fundamentals, including algorithms, data structures, and distributed systems
• Proficient in at least one backend language (e.g., Java, Kotlin, Go, Python)
• Solid understanding of REST API design and backend frameworks (e.g., Spring Boot)
• Experience working with cloud infrastructure (e.g., AWS, GCP) and container orchestration (e.g., Kubernetes)
• Strong focus on performance, reliability, and code quality
• Familiarity with observability and monitoring tools (e.g., Grafana, Prometheus, Splunk)