Senior Software Engineer, Notification Platform

Airwallex; Singapore; On-site; SGD 120,000 - 180,000; Full time

Job summary

Airwallex in Singapore is hiring a Senior Software Engineer for the Notification Platform. You will design, build, and operate the core messaging platform delivering SMS, Email, and Push notifications at scale.

You will own complex components, work with global teams, and drive high-quality engineering practices. Role requires 5+ years in large-scale systems and strong Java/Python/Go skills.

Qualifications

• Bachelor degree or above in computer science or engineering related majors with sophisticated level knowledge in designing and delivering of Enterprise Grade software systems.
• Experienced in Software Engineering with strong capabilities in modern programming languages like Java, Python or Go.
• 5+ years of experience in modern engineering practices focused on large-scale, low-latency, high-throughput systems.
• At least 3 years of experience building distributed systems using middleware (like Kafka, PostgreSQL) and have hands on experience on managing, maintaining and tuning event pipeline.
• Familiar with at least one : Java memory management, multi-threading, high concurrency, IO / NIO, network communication, etc.

Responsibilities

• Design, develop & maintain a resilient, high-throughput, low-latency Notification Platform to deliver messages (SMS, Email, Push) to our customers worldwide.
• Maintain a high architecture standard & craftsmanship through an Event Driven Architecture requiring high scalability, traceability & automation.
• Identify new opportunities to engage adopters through delightful adoption experience and extension over various channels, such as WhatsApp and inbox notifications.
• Engage with Product, Engineering, and Design teams across Airwallex's global offices, fostering effective communication through fast pace business transformation & providing data insights.
• Troubleshoot production issues across different levels of the stack.
• You’ll work hand‑in‑hand with the Issuing Platform team (powering Airwallex Cards & Transactions) as one of the primary consumers of your Platform.

Skills

Java

Python

Go

Distributed systems

Kafka

PostgreSQL

Memory management

Multithreading

IO/NIO

Event-driven architecture

Education

Bachelor's degree in Computer Science or Engineering

Tools

Kafka

PostgreSQL

Redis

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 250,000 businesses worldwide – including Brex, 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 2,300 of the brightest and most innovative people in tech across 27 offices around the globe. Valued at US$11 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 and operating 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.

About the Team

The Notification Platform engineering team at Airwallex builds and operates the core infrastructure that powers customer and internal communications across the company. The team owns the platform responsible for delivering notifications reliably, at scale, and across multiple channels, enabling product teams to engage users with the right message at the right time.

As a centralized platform team, Notification Platform bridges the gap between business needs and architectural excellence. The team builds and evolves a cloud-native platform using modern technologies and design patterns, including reactive programming, workflow orchestration, distributed systems, and advanced gateway integrations. The platform supports complex, organization‑wide communication use cases and provides the foundations that product teams rely on to deliver critical messaging experiences.

The team operates a highly I/O-intensive and mission‑critical system that serves the entire organization. This requires strong engineering craftsmanship, operational discipline, and a continuous innovation mindset. In addition to building and running core platform capabilities, the team also leads comprehensive evaluations of strategic solutions that shape notification architecture and platform direction across Airwallex.

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:

• Design, develop & maintain a resilient, high-throughput, low-latency Notification Platform to deliver messages (SMS, Email, Push) to our customers worldwide.

• Maintain a high architecture standard & craftsmanship through an Event Driven Architecture requiring high scalability, traceability & automation.

• Identify new opportunities to engage adopters through delightful adoption experience and extension over various channels, such as WhatsApp and inbox notifications.

• Engage with Product, Engineering, and Design teams across Airwallex's global offices, fostering effective communication through fast pace business transformation & providing data insights.

• Troubleshoot production issues across different levels of the stack.

• You’ll work hand‑in‑hand with the Issuing Platform team (powering Airwallex Cards & Transactions) as one of the primary consumers of your Platform.

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 engineering related majors with sophisticated level knowledge in designing and delivering of Enterprise Grade software systems.

• Experienced in Software Engineering with strong capabilities in modern programming languages like Java, Python or Go.

• 5+ years of experience in modern engineering practices focused on large-scale, low-latency, high-throughput systems.

• At least 3 years of experience building distributed systems using middleware (like Kafka, PostgreSQL) and have hands on experience on managing, maintaining and tuning event pipeline.

• Familiar with at least one : Java memory management, multi-threading, high concurrency, IO / NIO, network communication, etc.

Preferred qualifications:

• Wider interest beyond backend technologies, including design systems, search & AI technologies, gateway technologies and data analytics.

• Focus on automating tasks to concentrate on high-impact activities and are proactive in reducing technical debt.

• Experience with distributed databases or storage systems like PostgreSQL /Redis /NoSQL.

• Proficient in messaging patterns and resilience.

• Hands‑on knowledge with full implementation of Kafka.

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.