Senior Backend Engineer

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 a focus on reliability and maintainability
• Promote 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
• Proficiency in at least one backend language such as Java, Kotlin, Go, or Python
• Solid understanding of REST API design and backend frameworks like Spring Boot
• Experience working with cloud infrastructure (AWS or GCP) and container orchestration (Kubernetes)

Preferred Qualifications

• Familiarity with observability and monitoring tools such as Grafana, Prometheus, or Splunk

About the Company

Airwallex is a unified payments and financial platform for global businesses. Powered by proprietary infrastructure and software, we empower over 200,000 businesses worldwide—including Brex, Rippling, and Qantas—with integrated solutions to manage business accounts, payments, spend management, and treasury at a global scale.