Principal Engineer - Payments Products & Platform in Sydney

The role involves reimagining how small businesses get paid and how money moves. We're making a critical, multi-year investment in two connected engineering portfolios: Payments Products & Experiences and Payments Platform, and we're hiring a Principal Engineer for each. As our three-year payments strategy reaches a turning point, you'll help shape what comes next, with domain-level influence over the next two to three years.

You will shape technical strategy across multiple teams, partnering with senior stakeholders to turn complex requirements into scalable, resilient systems. Staying close to the technical detail, you'll set the example for a portfolio of 40 to 50 engineers. You'll also join a global community of Principal Engineers across Xero, driving engineering standards, architecture, and best practices.

The teams:

• Payments Products & Experiences: This portfolio is made up of our Get Paid and Growth teams, building the checkout, payment methods, flexible payments, and AI payment agents that help small businesses get paid on time.
• Payments Platform: This portfolio is the engine underneath, with provider integrations, bill payments, and a single, product-agnostic API that other Xero teams build on.

Together they move billions of dollars across more than 150,000 transactions a day, a number set to double as we grow into the UK and US.

The teams are currently working on:

• Tech stack: Microservices across web, API, and data layers, built in languages such as C#, Java, Go, or C++, running on AWS with SQL and NoSQL data stores.
• Current focus: Reviewing existing payments systems to work out what to extend, migrate, or rebuild, alongside Growth experiments and AI-powered payment chasing.
• Future focus: A multi-year payments architecture covering agentic payment workflows, payments inside AI assistants, and recurring payments.
• Global scale: Replatforming payment methods and designing global rails and a ledger ready for new markets.

Where and how you can work:

You will be based in Sydney or Melbourne, working a hybrid model that blends time together in our modern offices with the flexibility of working from home. Boost days bring teams together to connect and collaborate in person. With colleagues across Australia and the US and payment flows that run around the clock, you'll also work across time zones.

Some of the things we're looking for:

• You bring deep experience designing and running large-scale distributed systems in production, balancing reliability, performance, and cost, and any payments or fintech experience is a real plus.
• API-first thinking is second nature, and you're at home across web, API, and data layers, with fluency in at least one modern backend language, SQL and NoSQL stores, and cloud-native platforms, ideally AWS.
• Legacy-heavy systems are a puzzle you enjoy, and you make clear, practical calls on whether to extend, migrate, or build while staying hands-on through pairing, spikes, and code.
• A strong interest in utilising AI tooling is essential, as you will model how to use these technologies to automate tasks and improve engineering outcomes.
• Your background shows a deep curiosity for growth hacking and a proven ability to design and analyse A/B tests that drive product usage.
• You will mentor Staff and Senior engineers, shaping cross-team initiatives with Xero's Principal community and setting standards that lift engineering across Xero.