Senior Software Engineer, Spend

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 https://www.airwallex.com/en-us/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. A key part of Airwallex’s suite of Business Account software, the Spend Management team is revolutionizing the way businesses issue credit cards and manage expenses for their employees. This team solves complex challenges around the growing demands of data and feature complexity in credit cards and expenses. We work at the intersection of our backend infrastructure and customer facing applications, and we build distributed systems that manage millions of transactions. WHAT YOU'LL DO You will design and build the backend services that power Airwallex’s global financial platform, with a specific focus on the Spend team under the Accounting Hub. You will work on services that underpin how customers track, reconcile and account for spend transactions, ensuring accuracy, reliability and compliance of financial data. You will own features end to end, from technical design and implementation through to production operation, while helping shape the long-term architecture of our backend systems in the Spend and Accounting domains. You will partner closely with product, infrastructure and other engineering teams, and play a key role in raising the engineering bar through high-quality code and technical mentorship. This role is based in Melbourne. 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 ask for bank details, sensitive ID numbers (i.e. passport), or any form of payment during the application or interview process. All official communication will come from an @airwallex.com http://airwallex.com email address. Please apply only through careers.airwallex.com http://careers.airwallex.com or our official LinkedIn page. Airwallex does not accept unsolicited resumes from search firms/recruiters. Airwallex will not pay any fees to search firms/recruiters if a candidate is submitted by a search firm/recruiter unless an agreement has been entered into with respect to specific open position(s). Search firms/recruiters submitting resumes to Airwallex on an unsolicited basis shall be deemed to accept this condition, regardless of any other provision to the contrary. 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.