Senior Software Engineer, Billing

airwallex (singapore) pte. ltd.; Singapore; On-site; SGD 120,000 - 180,000; Full time

Job summary

Airwallex is seeking a senior Java engineer to design and build a scalable billing platform. Based in Singapore/Shanghai, you will lead architecture, mentor teams, and deliver high‑quality microservice components.

You will work with fintech platforms, build robust APIs, and adopt modern tech like Docker/Kubernetes, Spring Boot, and cloud services to support global customers.

Qualifications

• More than 5 years of Core Java development across internet/financial/e‑commerce systems.
• Over 1 year in payment platform development.
• Bachelor degree in computer science or related majors.
• Proficient in Java 8; strong multi‑threading and high concurrency.
• Familiar with design patterns and large‑scale distributed, high concurrency, high availability systems.
• Master server technologies to optimize service response and data queries.
• Familiar with Spring / Spring Boot.
• Familiar with HTTP, TCP/IP and REST specifications.
• Master Gradle / Maven and other build tools.
• Familiar with Docker cluster.
• Familiar with JSON & XML.

Responsibilities

• Lead planning, design, and implementation of the Airwallex engineering system.
• Collaborate with business/product teams to understand needs and architect solutions.
• Design and develop components within the microservice framework.
• Introduce innovative technologies and solutions for the team.
• Build and manage the technical team, establishing coding standards.

Skills

Core Java

High concurrency

Distributed systems

System analysis

Architecture design

Education

Bachelor degree in computer science or related

Tools

Java 8

Spring / Spring Boot

Gradle / Maven

Docker cluster

HTTP / TCP / IP

REST

JSON / XML

Kubernetes

NoSQL (Cassandra / Redis / Hadoop)

AWS / Aliyun Cloud

Job description

About the team

The Billing Team at Airwallex is at the forefront of transforming how businesses handle pricing, billing, and invoicing. Our mission is to create a seamless, scalable, and transparent billing platform that not only supports Airwallex's growth but also empowers our customers to easily manage their billing needs.

Our team is dedicated to developing a next-generation billing platform designed to offer flexible pricing strategies and intuitive invoicing solutions. This platform aims to be a cornerstone for businesses, enabling them to bill and get paid effortlessly. By integrating cutting-edge technology, we ensure that our solutions are easy to adopt and integrate, providing a robust billing experience for all users.

The engineering team spans across Shanghai and Singapore, offering the chance to collaborate with cross-functional teams around the world. Engage with various domains such as GTPN, PA, Scale, Issuing, and Spend to automate end-to-end pricing and billing processes. The work here is impactful, contributing to building a platform that empowers businesses globally, making a tangible difference in their operations.

What you’ll do

We envision a future where our billing platform not only supports Airwallex internally but also serves as an easy-to-integrate product for our customers. By joining our team, you play a crucial role in realizing this vision, working alongside talented professionals to deliver business-critical features and solutions. Together, we will build the next-gen billing solution that empowers businesses worldwide.

This role is based in Singapore/Shanghai, China.

Responsibilities:

1. Lead the planning, design, and implementation of the Airwallex engineering system;
2. Work with the business/product team to deeply understand the business needs, scenarios, and subsequent development directions, complete system analysis, architecture design, and core function development, and be able to grasp the design of complex systems to ensure the quality of complex architecture;
3. Design and develop components based on the company's microservice framework;
4. Introduce innovative technologies and innovative solutions for the team;
5. Responsible for the construction and management of the technical team, and establish good internal coding standards.

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:

1. More than 5 years of Core Java development, more than 5 years of experience in Internet application / large financial system / e-commerce platform development;
2. More than one year experience in payment platform development;
3. Bachelor degree in computer science and related majors;
4. Proficient in Java 8, familiar with Java multi-threading, high concurrency, IO / NIO, network communication, etc .;
5. Familiar with commonly used design patterns, with experience in design and development of large-scale distributed, high concurrency, high load, high availability systems;
6. Master various common server technologies, which can optimize service response and data query, ensure various service quality, and solve the problems of high concurrency and high availability;
7. Familiar with Spring / Spring Boot;
8. Familiar with HTTP, TCP / IP protocol and REST specifications;
9. Master Gradle / Maven and other build tools;
10. Familiar with the use of Docker cluster;
11. Familiar with JSON & XML.

Preferred qualifications:

• International clearing and settlement / foreign exchange transactions;
• Fluent in English;
• Cassandra / Redis / NoSQL / Hadoop;
• Kotlin / Scala / Python / Golang / R;
• Docker Swarm / Kubernetes;
• JavaScript / Angular / React / CSS3;
• Aliyun Cloud / AWS.