Senior Software Engineer, Issuing Platform

re-zoo-me; Singapore; On-site; SGD 120,000 - 180,000; Full time

Job summary

Airwallex, Singapore-based fintech, seeks a senior software engineer to design and implement backend services for card issuing, transaction processing, and settlement. You will deliver scalable, reliable systems and collaborate with cross-region teams while mentoring peers and improving code quality.

Required 5+ years in software engineering, strong Java/Kotlin/Go/Python, and hands-on cloud experience with GCP or AWS, Docker and Kubernetes.

Qualifications

• 5+ years of professional software engineering experience.
• Strong backend development experience using Java, Kotlin, Go, or Python.
• Experience building and operating distributed systems in production.
• Experience designing and building RESTful APIs.

Responsibilities

• Design, build, and operate backend services for card issuing, transaction processing, and settlement.
• Write high-quality, well-tested code with strong maintainability and operability.
• Design and implement RESTful APIs used by internal teams and external customers.
• Mentor peers through code reviews and technical guidance.
• Contribute to system reliability through monitoring, alerting, and on-call participation.

Skills

Java

Kotlin

Go

Python

Distributed systems

REST APIs

Kafka

Docker

Kubernetes

GCP/AWS

Education

Bachelor degree in Computer Science or Software Engineering

Tools

Docker

Kubernetes

GCP

AWS

Prometheus

Grafana

Job description

About Airwallex

Airwallex is the AI-native financial operating system for a real-time, intelligent economy. More than 676,000 businesses, including McLaren Racing, Qantas, SHEIN, and TikTok, use us, directly or through our platform partners, to run their financial operations or build and monetize financial products of their own.

We started in Melbourne in 2015 to build the infrastructure global commerce runs on. We're the regulated backbone behind global payments: not by accident, but by design. A decade plus, 85+ licenses, and a financial infrastructure spanning North America, Europe, the Middle East, and Asia-Pacific.

We're co-headquartered in San Francisco and Singapore, with more than 2,300 people across 27 offices. We hire builders with founder-level energy, people who move fast with good judgment, dig in with real curiosity, and make calls from first principles rather than waiting to be told what to do. Read our operating principles to see it in full.

About The Team

• Cards: Customer-facing and internal systems for card lifecycle management, controls, and configuration.
• Transactions: A global, high-throughput transaction processing platform designed for low latency, high availability, and resiliency.
• Settlement: Clearance, settlement, and dispute workflows that ensure financial accuracy and scheme compliance.

What you’ll do

As a senior software engineer, you are a strong individual contributor who takes ownership of complex components and delivers high-quality systems in collaboration with your team.

While you do not have direct reports, your impact will come from technical execution, sound design decisions, and helping raise the quality and effectiveness of the team through example and collaboration.

This role is based in Singapore.

Responsibilities

System design and implementation

• Design, build, and operate backend services that support card issuing, transaction processing, and settlement. Contribute to the design of scalable, resilient systems in a distributed environment.

Engineering quality and delivery

• Write high-quality, well-tested code with a strong focus on maintainability and operational readiness.
• Participate actively in code reviews, design discussions, and incident retrospectives.

API and platform development

• Design and implement RESTful APIs used by internal teams and external customers.
• Ensure APIs are reliable, well-documented, and easy to integrate with.

Collaboration and technical leadership

• Work closely with engineers, product managers, and stakeholders across regions to deliver outcomes.
• Mentor peer engineers through code reviews, pairing, and technical guidance.

Operational excellence

• Contribute to system reliability through monitoring, alerting, and on-call participation.
• Identify and address performance, scalability, and resiliency issues proactively.

Who You Are

We're looking for people who meet the minimum qualifications for this role. The preferred qualifications are great to have, but are not mandatory.

Minimum Qualifications

• Bachelor degree or above in computer science or software engineering related majors.
• 5+ years of professional software engineering experience.
• Strong backend development experience using Java, Kotlin, Go, or Python.
• Solid computer science fundamentals and understanding of object-oriented design.
• Experience building and operating distributed systems in production.
• Hands-on experience with event-driven architectures, for example Kafka.
• Experience designing and building RESTful APIs.
• Cloud experience with GCP (preferred) or AWS, including Docker and Kubernetes.
• Familiarity with observability tooling such as Splunk, Grafana, Prometheus, or similar.

Preferred Qualifications

• Experience in fintech, payments, or other high-reliability domains.
• Experience with JVM-based frameworks such as Spring or Spring Boot.

Applicant Safety Policy: Fraud and Third-Party Recruiters

To protect you from recruitment scams, please be aware that Airwallex will not ask for bank details, sensitive ID numbers (i.e. passport), or any form of payment during the application or interview process. All official communication will come from an @airwallex.com email address. Please apply only through careers.airwallex.com or our official LinkedIn page.

Airwallex does not accept unsolicited resumes from search firms/recruiters. Airwallex will not pay any fees to search firms/recruiters if a candidate is submitted by a search firm/recruiter unless an agreement has been entered into with respect to specific open position(s). Search firms/recruiters submitting resumes to Airwallex on an unsolicited basis shall be deemed to accept this condition, regardless of any other provision to the contrary.

Equal opportunity

Airwallex is proud to be an equal opportunity employer. We value diversity and anyone seeking employment at Airwallex is considered based on merit, qualifications, competence and talent. We don’t regard color, religion, race, national origin, sexual orientation, ancestry, citizenship, sex, marital or family status, disability, gender, or any other legally protected status when making our hiring decisions. If you have a disability or special need that requires accommodation, please let us know.