Senior Software Engineer, Issuing Platform

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 250,000 businesses worldwide – including Brex, 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 2,300 of the brightest and most innovative people in tech across 27 offices around the globe. Valued at US$11 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 The issuing engineering team at Airwallex builds and operates core systems for card issuing, transaction processing, and settlement at global scale. The team owns mission-critical platforms that underpin Airwallex’s issuing products, with a strong focus on reliability, scalability, and compliance. Key areas of ownership include: Cards: Customer-facing and internal systems for card lifecycle management, controls, and configuration. Transactions: A global, high-throughput transaction processing platform designed for low latency, high availability, and resiliency. Settlement: Clearance, settlement, and dispute workflows that ensure financial accuracy and scheme compliance. What you’ll do As a senior software engineer , you are a strong individual contributor who takes ownership of complex components and delivers high-quality systems in collaboration with your team. While you do not have direct reports, your impact will come from technical execution, sound design decisions, and helping raise the quality and effectiveness of the team through example and collaboration. This role is based in Singapore. Responsibilities: System design and implementation Design, build, and operate backend services that support card issuing, transaction processing, and settlement. Contribute to the design of scalable, resilient systems in a distributed environment. Engineering quality and delivery Write high-quality, well-tested code with a strong focus on maintainability and operational readiness. Participate actively in code reviews, design discussions, and incident retrospectives. API and platform development Design and implement RESTful APIs used by internal teams and external customers. Ensure APIs are reliable, well-documented, and easy to integrate with. Collaboration and technical leadership Work closely with engineers, product managers, and stakeholders across regions to deliver outcomes. Mentor peer engineers through code reviews, pairing, and technical guidance. Operational excellence Contribute to system reliability through monitoring, alerting, and on-call participation. Identify and address performance, scalability, and resiliency issues proactively. 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 degree or above in computer science or software engineering related majors. 5+ years of professional software engineering experience. Strong backend development experience using Java, Kotlin, Go, or Python. Solid computer science fundamentals and understanding of object-oriented design. Experience building and operating distributed systems in production. Hands-on experience with event-driven architectures, for example Kafka. Experience designing and building RESTful APIs. Cloud experience with GCP (preferred) or AWS, including Docker and Kubernetes. Familiarity with observability tooling such as Splunk, Grafana, Prometheus, or similar. Preferred qualifications: Experience in fintech, payments, or other high-reliability domains. Experience with JVM-based frameworks such as Spring or Spring Boot. 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 email address. Please apply only through 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.