Senior Backend Engineer, Stablecoin Platform

About Airwallex Airwallex is the AI-native financial operating system for a real-time, intelligent economy. More than 675,000 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. How you'll make impact You’ll build stablecoin infrastructure from the ground up, enabling customers and internal systems to buy, hold, send, and settle with tokenised currency globally. Design and implement secure systems for key management, transaction signing, gas fee management, and blockchain integration. Own services across the full lifecycle of stablecoin transactions, including minting, burning, transfers, and reconciliation. Build internal ledgering systems that track balances across multiple chains and token types. Integrate stablecoin infrastructure with Airwallex’s existing FX and payment systems to enable seamless conversion between supported currencies and stablecoins. Write, review, and ship production code while partnering with Product, Infrastructure, and Compliance to deliver reliable and auditable services. You’ll work from our Singapore office five days a week. What we're looking for Essentials Five or more years of experience as a software engineer, with deep expertise in object-oriented design and production-grade software development. Strong experience with at least one strongly typed language, such as Kotlin, Java, C#, C++, or Rust. Python experience is useful but isn’t sufficient on its own. Proven experience building and integrating blockchain infrastructure, such as wallets, transaction flows, or key management, into larger financial systems. Experience integrating new systems into legacy or distributed environments without introducing instability or regressions. Strong understanding of secure system design, particularly private key handling, signing, encryption, and operational controls. Ability to quickly pick up unfamiliar tools or frameworks and adjust to changing technical priorities. Clear communication skills and the ability to work effectively across engineering, product, and non-technical teams. Preferred Experience in FX, payments, or financial infrastructure. You'll thrive here if You're comfortable owning the roadmap yourself. You own the outcome and you don't wait for permission to fix what's broken. 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 say what you mean. You're direct, but you lead with respect. You’re comfortable operating across time zones with a globally distributed team, including colleagues based in APAC and EMEA. Learn more about your team Financial Markets at Airwallex is where foreign exchange, liquidity, and stablecoin capabilities come together to power the movement of money globally. We build the real-time pricing, execution, and risk systems behind FX across 60+ currencies, the platforms that manage cash positioning, safeguarding, and liquidity across our global financial network, and the infrastructure for stablecoin-powered payments and treasury operations. Engineers work closely with Treasury, Financial Operations, Financial Partnerships, Product, and Compliance to solve hard problems in distributed systems and global payments. This is a team for engineers who want to build greenfield systems at the intersection of traditional finance and blockchain, with a direct meaning on how Airwallex grows globally. If you want to help move and manage money for a global fintech, this is where that work happens. #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 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.