Senior Backend Engineer, Spend Team (Cards)

About Airwallex Airwallex is the AI-native financial operating system for a real-time, intelligent economy. More than 676,000 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. 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 will 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. Who you are We're looking for people who meet the minimum qualifications for this role. The preferred qualifications are great to have, but are not mandatory. Minimum qualifications 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. Preferred qualifications Familiarity with observability and monitoring tools (e.g., Grafana, Prometheus, Splunk). Applicant Safety Policy: Fraud and Third-Party Recruiters To protect you from recruitment scams, please be aware that Airwallex will not