Airwallex

Senior Software Engineer Backend, Billing

SG - Singapore. Posted 25 days ago

The role

You will lead the planning, design, and implementation of backend systems for the billing platform. You will build reliable components within a microservices architecture to support pricing, invoicing, and quote-to-cash workflows.

What you will do

  • 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 and shape technical direction.
  • Build reliable components within a microservices architecture.
  • Support flexible pricing, invoicing, and quote-to-cash workflows.
  • Own the architecture and development of complex, distributed systems with high concurrency and high availability.
  • Introduce practical technologies and engineering approaches to improve how the team builds, operates, and scales billing products.
  • Raise the bar on engineering quality through clear design practices, coding standards, and technical collaboration.

Required qualifications

  • 6+ years of core Java development experience
  • 5+ years building internet applications, large-scale financial systems, or e-commerce platforms
  • 1+ year of experience developing payment platforms
  • 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
  • Experience with the design and development of large-scale distributed, high-concurrency, high-load, and highly available systems
  • Experience with server-side technologies
  • Experience with optimising service response and data queries
  • A track record of solving complex engineering problems in production environments
  • Ability to work closely with Product and business teams to translate business needs into technical solutions

Nice to have

  • Experience with international clearing and settlement or foreign exchange transactions
  • Fluent English

About the company

Airwallex is an AI-native financial operating system for a real-time, intelligent economy. It provides financial infrastructure spanning North America, Europe, the Middle East, and Asia-Pacific.