Senior/ Staff Software Engineer, Core Banking in London

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. 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 Core Banking Platform team is crucial in powering Airwallex\’s global operations by facilitating client wallet transactions and ensuring the financial accuracy of client ledgers. Primarily based in Singapore, our lean team delivers a robust, high-performance distributed multi-currency wallet platform that supports the continuous growth of Airwallex products like global transfers, payments and acquiring, card issuing, and lending. As a dynamic group of engineers, we not only build impactful platforms and products but also develop tools and processes to enhance our efficiency and effectiveness.

What You\’ll Do

• Develop Cutting-edge Solutions: Lead the development of a transaction engine focused on scalability, financial accuracy, and adaptability.
• Build and maintain a distributed multi-currency wallet platform, providing precise financial oversight for client ledgers.
• Collaborate across teams with product and other engineer teams to ensure alignment between technical solutions and business objectives.
• Innovate productivity-enhancing tools and processes, exploring AI opportunities to continually improve our engineering practices and system observabilities.
• Thrive in a collaborative, energetic team environment that encourages innovation and continuous learning.

This role is based in Singapore.

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

• 5+ years experience in modern engineering practices focused on continuous integration/delivery and quality engineering
• A commitment to producing high quality and well tested solutions
• Strong computer science fundamentals/JVM based programming. While we do not mind what language you have most recently been using, we are using Kotlin
• Systems design experience
• Experience working with high throughput / low latency / HA distributed systems
• Experience in API design best practices
• Familiar with HTTP, TCP / IP protocol and REST specifications
• Mastery of Gradle / Maven or other build tools
• Familiar with the use of Docker cluster / Kubernetes
• Fluent English communication skills

Preferred Qualifications

• Experience in Kotlin / Scala;
• Asynchronous \’reactive\’ programming (RxJava, Akka, Spring Reactor, Vert.x);
• Kafka event streams;
• GCP, Alicloud or AWS (EC2, RDS, ELB, CloudFront, etc) and Kubernetes exposure;
• Operational tooling such as Splunk, New Relic, StatsD, Elk, Datadog, Prometheus

Applicant Safety Policy: Fraud and Third-Party Recruiters
To protect you from recruitment scams, please be aware that Airwallex will not ask for