Senior Backend Engineer, Spend Team (Cards)

About the Role

As a Senior Backend Engineer on the Cards team at Airwallex, you will design and build scalable backend systems that power our card issuance and expense management products. You will collaborate with cross-functional teams to deliver reliable, secure features while mentoring engineers and influencing the technical direction of the platform.

Responsibilities

• Design and implement scalable, secure backend services that power the Cards product.
• Contribute to the architecture and long-term technical vision of our backend systems.
• Own end-to-end delivery of new features and improvements,from design to production.
• Write high-quality, testable code with attention to reliability and maintainability.
• Promote and uphold engineering best practices, including observability and API design.
• Collaborate with cross-functional teams including product, infrastructure, and design.
• Provide technical mentorship and support the growth of other engineers on the team.

Requirements

• Bachelor’s degree in Computer Science, Software Engineering, or a related field.
• 5+ years of professional 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.

Preferred Qualifications

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