Senior Software Engineer (Backend), Growth at Airwallex

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 200,000 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 2,000 of the brightest and most innovative people in tech across 26 offices around the globe. Valued at US$8 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 [Upgrade to PRO to see link] 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. LOCATIONS: San Francisco / Singapore The Opportunity: Be Part of Our Growth Team Our Growth Team sits at the heart of Airwallex’s mission, focusing on user acquisition and strategic market expansion. We leverage data and cutting-edge technologies to craft seamless, intuitive experiences that help millions of users discover, engage with, and benefit from our products. From new-user funnels to onboarding optimizations, our Growth team is all about experimentation, rapid iteration, and driving sustainable business impact. Whether it’s designing scalable architectures for high-traffic pages, building robust A/B testing frameworks, or integrating global marketing platforms, the Growth team’s contributions directly shape how we attract and retain customers worldwide. Joining the Growth team means you’ll have a front-row seat to the most crucial stage of our product lifecycle and play a pivotal role in fueling the next wave of our global expansion. Responsibilities: - Design and Build Scalable Systems - Architect, develop, and maintain microservices in Java/Kotlin (or similar languages), ensuring our high-traffic, high-availability systems meet global user demands. - Implement best practices for service-to-service communication, orchestration, and fault tolerance. - Enable Data-Driven Decisions - Collaborate with data scientists and product managers to design data pipelines, analytics platforms, and event-driven architectures. - Ensure the data powering our Growth initiatives is accurate, reliable, and easily accessible. - Collaborate and Innovate - Work closely with cross-functional teams—Frontend, Product, Design, and Marketing—to translate business requirements into scalable backend solutions. - Participate in architectural reviews, code reviews, and strategy sessions to continually elevate the quality and performance of our backend services. - Experiment and Iterate - Develop services that support rapid A/B testing, feature toggles, and real-time performance monitoring. - Continuously improve backend functionalities to reduce friction, increase user engagement, and drive conversions. - Promote Security & Compliance - Integrate secure coding practices and frameworks to protect user data and maintain global regulatory compliance. - Identify potential vulnerabilities, ensure robust authentication and authorization mechanisms, and proactively address security risks. Who you are: - Experienced and Technically Proficient: You possess a wealth of experience in software development, underpinned by a robust expertise in Java/Kotlin. Your approach goes beyond mere coding; you are a craftsman of comprehensive solutions. As a technical bar raiser, you set high standards and lead by example, elevating the capabilities of those around you. - Empathetic and Insightful: Your deep empathy for customer needs drives your development process, allowing you to create intuitive and impactful products. This understanding is not just about meeting requirements, but about enriching user experiences. - Data-Driven and Analytical: You view data as a narrative element of development, a critical tool that informs your decision-making process. Your ability to interpret data enhances product performance and elevates user satisfaction, making you a pivotal member of our team. - Collaborative and Knowledge-Sharing: True collaboration is second nature to you. You thrive in team settings and are committed to sharing knowledge and ideas, which you see as vital to fostering innovation. Your role as a coach involves mentoring peers and promoting a learning culture within the team. - Adaptable and Continuously Learning: In the fast-paced world of fintech, you stand out for your agility and eagerness to adopt new skills and technologies. Challenges are opportunities for growth, and you are always prepared to expand your horizons. - Proactive and Ownership-Driven: You are self-motivated and take initiative, demonstrating a strong sense of ownership in your projects. Your proactive approach ensures that you are always ahead of the curve, ready to take on responsibilities and lead projects to successful outcomes. - Efficient and Prioritization-Savvy: You excel at prioritizing tasks, which enables you to manage your workload effectively while maintaining high standards of quality. This skill ensures that critical project components receive the attention they need without sacrificing overall progress. Minimum qualifications: - Bachelor degree or above in computer science or engineering related majors. - 5+ years of experience in modern engineering practices focused on continuous integration and quality engineering. - Strong computer science fundamentals, solid understanding of OOP concepts. - Experience domain driven design and event driven architectures. - Deep working experience with high throughput / low latency / high available distributed systems. - Cloud experience with GCP (preferred) or AWS (EC2, RDS, ELB, CloudFront, etc.) with Docker and Kubernetes. - Familiarity with observability tooling such as Splunk, Grafana, and Prometheus. Preferred qualifications: - Experience with JVM based programming Java or Kotlin, familiar with Spring/Spring Boot - Experience solving GTM operations end-to-end - Knowledge of data warehousing, customer segmentation, and analytics tools - Familiarity with building internal or customer-facing products with AI & LLMs 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 [Upgrade to PRO to see link] email address. Please apply only through careers.airwallex.com [Upgrade to PRO to see link] 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.