Staff Backend Engineer, Billing

Airwallex3 months ago

Location

SG - Singapore

Type

Full Time

Level

Staff

Role

Backend Engineer

Posted

Dec 4, 2025

Full TimeStaff

The role

Summary

Airwallex is seeking a Staff Backend Engineer for their Billing team to lead development of a next-generation billing platform that transforms pricing, invoicing, and billing processes for global businesses. This Singapore-based role involves architecting scalable systems using Java and microservices while collaborating with cross-functional teams across Shanghai and Singapore.

What you'll do

System Architecture Leadership: Lead the planning, design, and implementation of Airwallex's billing engineering system with complex architecture oversight

Business Requirements Analysis: Work with business and product teams to understand needs, scenarios, and development directions for billing solutions

System Design and Development: Complete system analysis, architecture design, and core function development for next-generation billing platform

Microservices Development: Design and develop components based on the company's microservice framework for scalable billing solutions

Technology Innovation: Introduce innovative technologies and solutions to enhance team capabilities and system performance

Team Leadership: Lead construction and management of technical team while establishing internal coding standards

Cross-functional Collaboration: Engage with various domains including GTPN, PA, Scale, Issuing, and Spend teams for end-to-end automation

Platform Integration: Build easy-to-integrate billing solutions that serve both internal Airwallex needs and external customer requirements

What we look for

Technical

Java Expertise8+ years of Core Java development experience with proficiency in Java 8, multi-threading, high concurrency, and IO/NIO

Payment Systems ExperienceMinimum 1 year experience in payment platform development with understanding of billing and financial systems

Distributed SystemsExperience in design and development of large-scale distributed, high concurrency, high load, and high availability systems

Server TechnologiesMastery of common server technologies for service response optimization and data query performance

Spring FrameworkFamiliarity with Spring and Spring Boot frameworks for enterprise application development

Network ProtocolsFamiliarity with HTTP, TCP/IP protocol and REST specifications for web service development

Build ToolsProficiency with Gradle/Maven build tools for project management and automation

ContainerizationFamiliarity with Docker cluster usage for application deployment and scaling

Education

Bachelor's DegreeBachelor's degree in Computer Science or related technical field required

Experience

Internet Applications5+ years experience in Internet application, large financial system, or e-commerce platform development

Design PatternsProficiency in commonly used design patterns with practical application in large-scale systems

System ArchitectureExperience with complex system design ensuring quality architecture for enterprise-level applications

Skills

Required skills

Java Development8+ years of Core Java experience with proficiency in Java 8, multi-threading, and high concurrency

Payment Platform DevelopmentMinimum 1 year experience in payment platform development

Distributed Systems DesignExperience with large-scale distributed, high concurrency, and high availability systems

Spring FrameworkProficiency with Spring and Spring Boot for enterprise application development

Network ProtocolsHTTP, TCP/IP protocol knowledge and REST API specifications

Build ToolsGradle/Maven for project build automation and dependency management

ContainerizationDocker cluster usage for application deployment and scaling

Data FormatsJSON and XML for data interchange and processing

Nice to have

Financial Domain KnowledgeInternational clearing and settlement or foreign exchange transactions experience

English ProficiencyFluent English for global team collaboration

NoSQL TechnologiesCassandra, Redis, NoSQL databases, and Hadoop for big data processing

Additional LanguagesKotlin, Scala, Python, Golang, or R for diverse technical challenges

Container OrchestrationDocker Swarm or Kubernetes for advanced container management

Frontend TechnologiesJavaScript, Angular, React, CSS3 for full-stack development

Cloud PlatformsAliyun Cloud or AWS for scalable cloud infrastructure

Compensation & benefits

Benefits

Global Team Collaboration

Work with over 2,000 innovative professionals across 26 offices worldwide

High-Impact Projects

Work on business-critical features that serve over 200,000 businesses globally including Brex, Rippling, and SHEIN

Career Growth

Accelerated learning opportunities and true ownership in building the future of global banking

Innovation Environment

Access to cutting-edge technology and AI tools to work smarter and solve problems faster

Equal Opportunity

Inclusive workplace that values diversity and provides equal opportunities regardless of background

Founder-like Impact

Real impact opportunities with founder-like energy in a fast-growing fintech unicorn

Interview process

1
Application Review — Initial screening of technical background and experience in Java development and payment systems
2
Technical Phone Screen — Phone interview focusing on Java expertise, system design concepts, and payment platform experience
3
System Design Interview — In-depth technical interview covering distributed systems architecture and billing platform design
4
Coding Assessment — Hands-on coding challenge demonstrating Java proficiency and problem-solving skills
5
Team Fit Interview — Cultural fit assessment and discussion with potential team members
6
Final Leadership Interview — Interview with engineering leadership to assess technical leadership and vision alignment