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Airwallex Logo Airwallex · IT - Software Development

Software Engineer II

Singapore, Singapore · Job Posted February 21, 2026
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Job Description

As a Senior Engineer on the Spend team, you will design and build scalable backend systems. You will collaborate with cross-functional teams to deliver reliable, secure features while mentoring engineers and influencing the technical direction of the platform. The Spend team are revolutionising the way businesses manage their spend and manage bills, credit cards and expenses. This team solves complex challenges around the growing demands of data and feature complexity in credit cards, bills and and expenses, and they work at the exciting intersection of our backend infrastructure and customer facing applications, working on distributed systems that manage millions of transactions.

Job Responsibility

  • Design and build scalable backend systems
  • Collaborate with cross-functional teams to deliver reliable, secure features
  • Mentor engineers and influence the technical direction of the platform
  • Strong focus on technical excellence through high-quality coding and sound system design
  • Committed to delivering high-quality, well-tested solutions
  • Experienced in designing and building REST APIs
  • Collaborates effectively with cross-functional, multi-regional teams
  • Takes a pragmatic approach to problem-solving, weighing trade-offs before adopting new technologies

Requirements

  • Bachelor’s degree in Computer Science, Software Engineering, or a related field
  • Minimum 2 years of relevant software engineering experience
  • Hands-on experience designing and building backend systems and APIs in production
  • Strong computer science fundamentals, including algorithms, data structures, and distributed systems
  • Proficient in at least one backend language (e.g., Java, Kotlin, Go, Python)
  • Solid understanding of REST API design and backend frameworks (e.g., Spring Boot)
  • Experience working with cloud infrastructure (e.g., AWS, GCP) and container orchestration (e.g., Kubernetes)
  • Strong focus on performance, reliability, and code quality

Nice to have

Familiarity with observability and monitoring tools (e.g., Grafana, Prometheus, Splunk)

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