(Senior) Software Engineer, Payments Team - API & Checkout Experience

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.
As Airwallex's core business team, we saw an impressive 300%+ positive growth from 2023 to 2024, and in the second half of 2025, we'll keep recruiting tech-passionate engineers to join us in building new features, creating new products, and working on large-scale distributed systems, real-time transaction processing (while ensuring system stability, scalability and high availability) as well as exploring how to use AI to drive more value for business scenarios.
Hiring Location: Singapore, Shanghai relo to Singapore
Airwallex is a rapidly growing fintech unicorn, founded in 2015 and now flourishing at the Series E financing stage. With a global footprint across Asia-Pacific, Europe, North America, and APAC, we specialize in providing diverse financial payment solutions for B2B merchants, empowering businesses to operate seamlessly anywhere, anytime.
Who We Are? About the Team:
As a global engineering powerhouse, our team spans China, the Netherlands, and Singapore, embracing a rich tapestry of cultures and perspectives. Guided by our True North Vision, we're passionately striving to become the preferred payment partner for businesses seeking to boost revenue and streamline expenses.
Our mission is to simplify the complexities of payments for businesses by designing solutions that seamlessly integrate into their workflows, enhancing efficiency and driving customer conversion rates. Within our diverse and dynamic team, you'll find yourself at the intersection of innovation and practicality, where every contribution is essential in making payment processes effortless.
Joining us means becoming part of a global community of engineers leading the charge in reshaping the payments landscape while actively contributing to the operational success of businesses worldwide. Together, we're dedicated to revolutionizing financial operations for businesses, positioning our solutions as the cornerstone of their success.
About The Role:
Now, the Global Payments Team is recruiting experts in API & Checkout Experience. You will be based in the Shanghai R&D center, serving as a key member of the team.
You will be involved in the design, development, and maintenance of the APIs and Checkout features for various scenarios (incl. empowering front-end and mobile SDKs, and other Payment-based products like Payment Link), assisting merchants of all business scales and integration capabilities in achieving end-to-end payment services and enhancing user experiences. Definitely, as a key member, you will actively develop new features, optimize the code, and collaborate closely with teams across different domains and locations.
In this role, you will:

• Collaborate with various systems and teams to establish a robust foundation for our global payment infrastructure.
• Engage with engineering teams across Airwallex's global offices, fostering effective communication.
• Regularly collaborate with users and financial partners to ensure seamless integration.
• Design, develop, and maintain APIs, services, and systems to uphold a reliable payment processing flow.
• Troubleshoot production issues across different levels of the stack.
• Take ownership of and optimize critical components within Airwallex's online payment processing flow.

You might be a great fit if you:

• Possess a minimum of 3 (for senior 5) years of engineering experience.
• Excel in designing elegant systems that abstract complex patterns, particularly in the financial industry.
• Have a strong aptitude for system thinking, writing high-quality code and doc, with a preference for Kotlin.
• Uphold high standards when working with production systems.
• Adhere to best practices in engineering, security, and design.
• Thrive in collaborative environments, making decisions with diverse stakeholders and subject matter experts.
• Enjoy collaborating with a diverse group of individuals, bridging gaps between different teams and areas of expertise.

Bonus if you have:

• Familiarity with Spring / Spring Boot.
• Proficiency in Java / Kotlin or other modern programming languages.
• Proficiency in HTTP protocol and RESTful specifications.
• Familiarity with OAuth2.0 / JWT.
• Experience with PostgreSQL / Redis / NoSQL.
• Experience with Kafka / RabbitMQ.
• Familiarity with Nginx / Istio.
• Experience with cloud vendors like Aliyun Cloud, GCP, or AWS.
• Experience in designing, implementing, and maintaining complex public API products with user integration guides.

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.