Senior Software Engineer

airwallex (singapore) pte. ltd.; Singapore; On-site; SGD 120,000 - 180,000; Full time

Job summary

Airwallex Singapore is seeking a senior engineer to own the design and operation of large-scale distributed systems. You will work across teams to deliver robust, scalable infrastructure built with Java, Kotlin or Go and modern data processing stacks.

You’ll thrive on ambiguity, drive architecture decisions, and mentor others, with a focus on AI/ML infrastructure and real-time performance. This role is based in Singapore.

Qualifications

• 5+ years of experience building and operating large-scale distributed systems or infrastructure platforms.
• Strong understanding of computer science fundamentals, including distributed systems, memory management and networking protocols.
• Proficiency in Java, Kotlin or Go.
• Hands-on experience with, or a strong desire to work deeply in, technologies such as Kafka, Flink, Spark, Kubernetes or OLAP engines.
• Experience taking complex technical challenges from initial design through production stability.
• Experience with performance tuning and systems internals, including state management, checkpointing and exactly-once semantics.
• A track record of providing technical leadership through architecture decisions, design reviews or mentorship.
• Curiosity about AI/ML infrastructure and real-time systems, with a focus on creating tangible business impact.

Skills

Distributed systems

Computer science fundamentals

Java/Kotlin/Go

Kafka/Flink/Spark/Kubernetes/OLAP

Production stability

Performance tuning

Architecture leadership

AI/ML infra interest

Job description

About Airwallex

Airwallex is the only unified payments and financial platform for global businesses. Powered by our unique combination of proprietary infrastructure and software, we empower over 200,000 businesses worldwide – including Brex, Rippling, Navan, Qantas, SHEIN and many more – with fully integrated solutions to manage everything from business accounts, payments, spend management and treasury, to embedded finance at a global scale.

Proudly founded in Melbourne, we have a team of over 2,000 of the brightest and most innovative people in tech across 26 offices around the globe. Valued at US$8 billion and backed by world-leading investors including T. Rowe Price, Visa, Mastercard, Robinhood Ventures, Sequoia, Salesforce Ventures, DST Global, and Lone Pine Capital, Airwallex is leading the charge in building the global payments and financial platform of the future. If you’re ready to do the most ambitious work of your career, join us.

Attributes We Value

We hire successful builders with founder-like energy who want real impact, accelerated learning, and true ownership. You bring strong role‑related expertise and sharp thinking, and you’re motivated by our mission andoperating principles. You move fast with good judgment, dig deep with curiosity, and make decisions from first principles, balancing speed and rigor.

You’re humble and collaborative; turn zero‑to‑one ideas into real products, and you “get stuff done” end‑to‑end. You use AI to work smarter and solve problems faster. Here, you’ll tackle complex, high‑visibility problems with exceptional teammates and grow your career as we build the future of global banking. If that sounds like you, let’s build what’s next.

This role is based in Singapore.

What we’re looking for

Essentials

• 5+ years of experience building and operating large-scale distributed systems or infrastructure platforms.

• Strong understanding of computer science fundamentals, including distributed systems, memory management and networking protocols.

• Proficiency in Java, Kotlin or Go.

• Hands‑on experience with, or a strong desire to work deeply in, technologies such as Kafka, Flink, Spark, Kubernetes or OLAP engines.

• Experience taking complex technical challenges from initial design through production stability.

• Experience with performance tuning and systems internals, including state management, checkpointing and exactly‑once semantics.

• A track record of providing technical leadership through architecture decisions, design reviews or mentorship.

• Curiosity about AI/ML infrastructure and real‑time systems, with a focus on creating tangible business impact.

You’ll thrive here if

• You’re comfortable owning the roadmap yourself.

• You’re comfortable with ambiguity. Give you a problem, not a prescription, and you’ll run with it.

• You hold yourself to a high standard even when no one is watching. Quality and accountability aren’t external expectations, they’re internal ones.

• You connect dots across functions and hold the big picture without losing grip on the details.

• You simplify complexity rather than hiding behind it.