Senior Software Engineer, Backend

Airwallex is a unified payments and financial platform for global businesses. Powered by our unique combination of proprietary infrastructure and software, we empower over 150,000 businesses worldwide with fully integrated solutions to manage everything from business accounts, payments, spend management, and treasury, to embedded finance at a global scale.

Founded in Melbourne, we have a team of over 1,700 of the brightest and most innovative people in tech across 26 offices around the globe. Valued at US$6.2 billion and backed by world-leading investors including Visa, Airtree, Blackbird, Sequoia, DST Global, Greenoaks, Salesforce Ventures, Lone Pine, and Square Peg, 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.

Airwallex is the leading financial technology platform for modern businesses growing beyond borders. With one of the world's most powerful payments and banking infrastructure, our technology empowers businesses of all sizes to accept payments, move money globally, and simplify their financial operations, all in one single platform.

Established in 2015 in Melbourne, our purpose is to connect entrepreneurs, business builders, makers, and creators with opportunities in every corner of the world. Today, Airwallex has a global footprint across Asia-Pacific, Europe, and North America.

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 tokenized 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

Who You Are

• A highly experienced engineer (8+ 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
• Bonus: experience in FX, payments, or financial infrastructure is useful but not required

Why Join Us

• Be Part of Something Big: Join a team that's redefining the future of finance. Contribute directly to the core engine of user growth in a company that is reshaping global financial services.
• Grow With Us: At Airwallex, we're committed to your professional development. You'll have opportunities to learn, grow, and shape your career path in a fast-paced, innovative environment.
• Collaborate With the Best: Work with a team of talented and passionate individuals who are driven by the desire to create something extraordinary.

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.

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.