Staff Backend Engineer - Payments Platform (Greenfield)

The Onset

Sydney

On-site

AUD 180,000 - 280,000

Full time

9 days ago
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Job summary

The Onset is building a greenfield payments and billing platform in Sydney. You’ll join a small founding team as a Staff/Principal Backend Engineer, shaping core architecture and API design.

You’ll own how services interact, ensure reliability, and drive decisions in a fast-moving, autonomous environment. Lead backend work across payments, pricing, and APIs, with a strong emphasis on correctness and scalability in a cloud-native setting.

Qualifications

  • Strong Java/JVM experience with distributed backend systems.
  • Experience designing and building payment/billing infrastructures.
  • Ability to own complex technical decisions end-to-end.

Responsibilities

  • Design and own backend components for payments & billing platform.
  • Define service boundaries and API designs for customers building on the platform.
  • Ensure reliability, performance, and observability of core infrastructure.
  • Collaborate with founders to shape architecture and engineering standards.

Skills

Java
JVM
Distributed systems
APIs
Cloud infrastructure
Backend architecture
Ownership

Tools

Spring
Kubernetes

Job description

The Onset is building a greenfield payments and billing platform in Sydney. You’ll join a small founding team as a Staff/Principal Backend Engineer, shaping core architecture and API design.

You’ll own how services interact, ensure reliability, and drive decisions in a fast-moving, autonomous environment. Lead backend work across payments, pricing, and APIs, with a strong emphasis on correctness and scalability in a cloud-native setting.

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