Job Description

Job Description Senior Full Stack Engineer – Kotlin / Spring Boot / React n

Sydney | Hybrid | 6-Month Day Rate Contract + Likely Extension

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We’re partnering with a major Australian enterprise going through significant technology transformation, with a number of greenfield initiatives on the roadmap.

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We’re looking for a strong backend-leaning Full Stack Engineer who enjoys solving complex problems, owning outcomes and working across the stack when needed.

The opportunity n

You’ll work within a modern product engineering setting, building and evolving scalable applications while contributing to recent greenfield development.

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The backend is centred around Kotlin and Spring Boot , but this isn’t a purely backend role. You’ll need enough frontend capability to comfortably work across modern JavaScript applications, with TypeScript and React particularly relevant.

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There’s also a strong focus on how engineers are harnessing AI tooling to improve the way they build software . We’re keen to meet developers already using tools such as Claude Code, Cursor,



Copilot or coding agents to accelerate development, testing, debugging and delivery.

What we’re looking for n

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Strong Kotlin / Java and Spring Boot engineering experience
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Genuine full stack capability , with a backend bias
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Exposure to JavaScript, TypeScript and/or React
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Experience building APIs, microservices and distributed applications
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Good exposure to modern AWS or GCP cloud environments
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Engineers actively incorporating AI tooling into their development workflows
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Strong problem-solving skills and the ability to take ownership from idea through to production
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Comfortable working within modern CI/CD and product engineering environments
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Initial 6-month day rate contract with a solid likelihood of extension.

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If you’re a hands-on engineer who enjoys difficult technical problems, up-to-date technology and the opportunity to contribute to genuine greenfield development, I’d be keen to hear from you.

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📌 Staff Engineer Spring Boot Kotlin Gcp (Sydney)
🏢 The Onset
📍 Sydney