Senior Backend Engineer, Stablecoin Platform

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 The Financial Markets team is responsible for Airwallex’s core FX and liquidity infrastructure. We’re now expanding into building the stablecoin infrastructure that will enable both customers and internal systems to buy, hold, send, and settle with tokenised currency globally. This includes support for near-instant global payments, on-chain liquidity, and seamless conversion between fiat and stablecoin balances. We’re building stablecoins into the core of Airwallex’s infrastructure, so they function as seamlessly as any fiat currency across our global platform. We're seeking a skilled developer to take a leading role in advancing our initiatives. Someone who can both architect and build robust, reliable systems and tackle the challenges of blockchain integration, digital asset custody, and global payments infrastructure. What You’ll Do Be part of a high-impact engineering team building stablecoin infrastructure from the ground up. Design and implement secure systems for key management, transaction signing, gas fee management, and blockchain integration Own services that manage the full lifecycle of stablecoin transactions mint, burn, transfer, reconciliation Build internal ledgering systems that track balances across multiple chains and token types Integrate stablecoin infrastructure into Airwallex’s existing FX and payment systems, enabling seamless conversion between any supported currency and stablecoins Write, review, and ship production code Collaborate with product, infrastructure, and compliance teams to deliver reliable and auditable services Responsibilities Minimum qualifications: A highly experienced engineer (5+ years) with deep expertise in object-oriented design and production-grade software development, including at least one strongly typed language (e.g. Kotlin, Java, C#, C++, Rust); Python experience is useful but not sufficient on its own Proven experience building and integrating blockchain infrastructure (wallets, transaction flows, key management, etc.) into larger financial systems Experienced in integrating new systems into legacy or distributed environments without introducing instability or regressions. Strong grasp of secure system design, particularly around private key handling, signing, encryption, and operational controls Able to quickly pick up unfamiliar tools or frameworks when needed and adjust to changing technical priorities. Clear communicator who works well across engineering, product, and non-technical teams Preferred qualifications: Experience in FX, payments, or financial infrastructure is useful but not required #Singapore 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 offici