Senior Software Engineer Backend, Billing

About the role

Airwallex's Billing team is building the next generation of billing infrastructure for Airwallex and its customers. You will help shape the architecture and deliver reliable backend systems that support complex financial workflows, working from the Singapore office.

Key responsibilities

• Lead the planning, design and implementation of backend systems for the billing platform.
• Partner with Product and business teams to understand customer and business needs, shape technical direction and deliver core functionality.
• Build reliable components in a microservices architecture, including systems supporting 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 engineering quality through clear design practices, coding standards and constructive technical collaboration.

Required profile

• 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.
• Bachelor's degree in Computer Science or a related field.
• Track record of solving complex engineering problems in production environments.
• Ability to work closely with Product and business teams, translate business needs into technical solutions and make sound architectural decisions.
• Fluent English; preferred.
• Preferred: experience with international clearing and settlement or foreign exchange transactions.

Required skills

• Strong command of Java 8, including multithreading, high concurrency, I/O or NIO and network communication.
• Experience with common design patterns and large-scale distributed, high-concurrency, high-load and highly available systems.
• Experience with server-side technologies and optimising service response and data queries.
• Comfortable owning the roadmap and working in person five days a week.