Senior Backend Engineer, Agentic AI

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 help design the backend foundations for T:0’s intelligent finance systems: scalable services, resilient APIs, and thoughtful data models that support agentic workflows, AI copilots, and real-time financial infrastructure. Build typed, production-grade APIs and services in Python using FastAPI and Pydantic. Develop resilient infrastructure primitives, including queues, retries, idempotency, observability, and backpressure handling, so teams can ship quickly without sacrificing reliability. Work at the intersection of systems and AI, building feedback loops where product data continuously improves models and models improve system behaviour. Ship platform foundations, including internal frameworks, SDKs, and tooling, that accelerate engineers across the organisation. Partner closely with ML and product teams to productionise research-grade ideas into customer-facing systems. Help define the architecture of an AI-native financial stack by designing software with AI as a first-class runtime rather than bolting AI onto existing systems. You’ll work from our San Francisco office three days a week. What we're looking for Essentials 5+ years of backend engineering experience with Python at scale. Deep knowledge of SQL and NoSQL database design. Experience with distributed systems, event-driven architectures, or microservices. Familiarity with GCP services such as Pub/Sub, Cloud Run, Cloud SQL, BigQuery, and KMS. Strong understanding of security and compliance best practices. Experience designing and operating reliable, production-grade services. A passion for building the backend systems that power intelligent products. Preferred Experience building agentic workflows, AI copilots, or AI-native products. Experience with financial systems, ledgers, payments, accounting, or other high-integrity domains. Experience building internal platforms, frameworks, SDKs, or developer tooling. Experience partnering closely with ML and product teams to productionize research or prototypes. You'll thrive here if You're comfortable owning the roadmap yourself. You're comfortable making decisions with incomplete information and moving quickly anyway. You're excited by a category that hasn't been won yet, and want to be early enough to shape it. You're comfortable with ambiguity. Give you a problem, not a prescription, and you'll run with it. You default to action. You'd rather course-correct in motion than wait for perfect clarity. Learn more about your team T:0's mission is to make finance run itself. We're building an AI-native accounting platform that closes the books, reconciles, and reports continuously, so founders can stop managing their finances and start using them to run the business. The hard part isn't adding AI to accounting. It's making AI you can trust with the books. We use AI to understand how a business works, then run the actual accounting on strict, checkable rules, and no black box deciding the numbers. That's why customers pick us over both the legacy tools they've outgrown and the AI wrappers they don't trust. And bookkeeping is just the start: we're building toward a full financial operating system for how companies account, plan, and operate. The team is small, elite, and builder-focused, led by operators with a track record of shipping AI products at scale. We sit inside Airwallex, which means startup speed with a scaled company's infrastructure, distribution, and capital behind us. You'll work directly from real customer pain, own outcomes end to end, and ship fast. 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.