Senior Backend Engineer, Agentic AI

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.

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