Senior Software Engineer, Notification Platform

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. 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.

Requirements

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.

Nice to have

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.