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Senior Software Engineer Backend, Billing

Airwallex· Engineering
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SG - SingaporeFull-timePosted 8mo ago

About the role

Senior backend engineer focusing on billing infrastructure, architecture, and distributed systems to support Airwallex’s billing platform with high concurrency, availability, and financial accuracy.

Responsibilities

  • Lead the planning, design, and implementation of backend systems for Airwallex’s billing platform.
  • Partner with Product and business teams to understand customer and business needs, shape technical direction, and deliver core functionality.
  • Build reliable components within a microservices architecture, including systems that support flexible pricing, invoicing, and quote-to-cash workflows.
  • Own the architecture and development of complex, distributed systems with high concurrency, high availability, and strong financial accuracy.
  • Introduce practical technologies and engineering approaches that improve how the team builds, operates, and scales billing products.
  • Raise the bar on engineering quality through clear design practices, coding standards, and constructive technical collaboration.

Qualifications

  • 6+ years of core Java development experience and 5+ years building internet applications, large-scale financial systems, or e-commerce platforms. 1+ year of experience developing payment platforms.
  • A bachelor’s degree in Computer Science or a related field.
  • Strong command of Java 8, including multithreading, high concurrency, I/O or NIO, and network communication.
  • Experience with common design patterns and the design and development of large-scale distributed, high-concurrency, high-load, and highly available systems.
  • Experience with server-side technologies and with optimising service response and data queries to maintain service quality.
  • A track record of solving complex engineering problems in production environments.
  • The ability to work closely with Product and business teams, translate business needs into technical solutions, and make sound architectural decisions.
Last updated Oct 22, 2026. Interested? Apply on the company site.
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About Airwallex

Trusted Global Payments & Financial Platform

Grow your business faster with Airwallex - global business accounts, high speed transfers, multi-currency cards, online payments, embedded finance, and more.

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