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 Tik Tok, 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 This team designs intelligent, autonomous systems that eliminate financial operations for companies globally. We automate everything from bookkeeping and reconciliation to tax, payroll, forecasting, and document understanding: turning hours of work into seconds. The team blends deep research pedigree with proven industry experience. We operate with high standards, are tool-agnostic, and expect engineers to own problems end-to-end. We collaborate closely, push boundaries responsibly, and ship exceptional work quickly.

You’ll solve unprecedented technical challenges using unique, end-to-end financial datasets no one else in the industry has.

About the Role As a Senior Backend Engineer, you’ll help design the backbone of our intelligent finance systems: scalable services, resilient APIs, and thoughtful data models. Our backend is primarily Python on GCP, and your work will ensure we can move quickly while maintaining enterprise-grade reliability and security.

What You'll DoBuild typed, production-grade APIs and services in Python (FastAPI + Pydantic) that power agentic workflows, AI copilots, and real-time financial infrastructure.

Develop resilient infrastructure primitives (queues, retries, idempotency, observability, back pressure handling) that let teams ship fast without sacrificing reliability.

Work at the intersection of systems + AI, building feedback loops where product data continuously improves models and models autonomously improve system behavior.

Ship platform foundations, not one-off features internal frameworks, SDKs, and tooling that accelerate every engineer in the org.

Partner closely with ML + product teams to product ionize research-grade ideas into real customer-facing systems.

Help define the architecture of an AI-native financial stack not bolting AI onto software, but designing software assuming AI is a first-class runtime.

This role is based in San Francisco.

What You’ll Need to have5+ years backend experience with Python p knowledge of SQL/No

SQL database design.

Experience with distributed systems, event-driven architectures, or microservices.

Familiarity with GCP services (Pub/Sub, Cloud Run, Cloud SQL, Big Query, KMS, etc.).Strong grasp of security and compliance best practices.

Passion for building the backend that powers intelligent products.

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