Software Engineer II, Spend Team (FinOS)

Airwallex1 months ago

Location

SG - Singapore

Type

Full Time

Level

Mid

Role

Backend Engineer

Posted

Jan 16, 2026

Full TimeMid

The role

Summary

Airwallex is seeking a Software Engineer II for their Spend Team within FinOS to design and build scalable backend systems managing spend, bills, credit cards, and expenses. This role involves developing distributed systems handling millions of transactions while collaborating with cross-functional teams and requires 2+ years of backend engineering experience with Java/Kotlin/Go/Python and cloud infrastructure expertise.

What you'll do

Backend System Design: Design and build scalable backend systems for spend management, bills, credit cards, and expenses handling millions of transactions

API Development: Design and implement REST APIs with focus on performance, reliability, and security

Cross-functional Collaboration: Work effectively with cross-functional, multi-regional teams including product managers, designers, and frontend engineers

Code Quality Assurance: Maintain high coding standards through code reviews, testing, and technical excellence

System Architecture: Contribute to technical direction and architecture decisions for the platform

Problem Solving: Take pragmatic approach to complex technical challenges, weighing trade-offs before adopting new technologies

Production Systems: Build and maintain production-grade systems with focus on reliability and scalability

Technical Mentoring: Guide junior engineers and share technical knowledge within the team

What we look for

Technical

Backend DevelopmentHands-on experience designing and building backend systems and APIs in production

Computer Science FundamentalsStrong understanding of algorithms, data structures, and distributed systems

Programming LanguagesProficiency in at least one backend language (Java, Kotlin, Go, Python)

API DesignSolid understanding of REST API design principles and best practices

Cloud InfrastructureExperience with cloud platforms (AWS, GCP) and containerization

Performance OptimizationFocus on performance, reliability, and code quality in production systems

Education

Bachelor's DegreeBachelor's degree in Computer Science, Software Engineering, or related field

Experience

Software Engineering ExperienceMinimum 2 years of relevant software engineering experience

Production ExperienceExperience building and maintaining production systems at scale

Backend FrameworksHands-on experience with backend frameworks like Spring Boot

Skills

Required skills

Backend ProgrammingProficiency in Java, Kotlin, Go, or Python for building scalable systems

REST API DesignStrong understanding of RESTful API design and implementation

Cloud PlatformsExperience with AWS or GCP for deploying and managing applications

Container OrchestrationHands-on experience with Kubernetes and Docker

System DesignAbility to design distributed systems and microservices architecture

Database ManagementExperience with both relational and NoSQL databases

Nice to have

Observability ToolsFamiliarity with Grafana, Prometheus, and Splunk for monitoring

Financial TechnologyExperience in fintech or payment processing systems

Spring Boot FrameworkAdvanced knowledge of Spring Boot for enterprise applications

Performance OptimizationExperience optimizing high-throughput systems

Multi-regional SystemsExperience building systems across multiple geographic regions

Compensation & benefits

Stock options

Available

Benefits

Global Impact

Work on products used by over 200,000 businesses worldwide including major brands

Career Growth

Accelerated learning opportunities in a fast-growing fintech unicorn

International Team

Collaborate with 2,000+ innovative professionals across 26 global offices

Cutting-edge Technology

Work with latest technologies and AI tools to solve complex problems

Equity Participation

Opportunity to own part of a US$8 billion valued company

Equal Opportunity

Inclusive workplace that values diversity and equal opportunity

Interview process

1
Application Review — Initial screening of resume and qualifications by the recruitment team
2
Phone/Video Screening — 30-minute conversation with hiring manager to discuss background and role fit
3
Technical Assessment — Coding challenge focusing on backend development and system design
4
Technical Interview — In-depth technical discussion covering algorithms, system design, and experience
5
Team Fit Interview — Cultural fit assessment with team members and cross-functional partners
6
Final Round — Discussion with senior leadership about vision, impact, and long-term goals