Senior Software Engineer (Lead Full Stack Engineer - AI).

Contract Length: 6 Months with the view to extend - 3 - 5-year program of work
Location: Sydney CBD, Australia
Reports to: Senior Engineering Manager
Immediate team: 1 x Senior Engineering Manager, 4 x Technical Leads, 10 x Software Engineers.
Working arrangement: 3 days in office, flexible working hours.

Role Purpose:

The role also involves building agentic AI systems and contributing to a range of AI initiatives across distributed systems, cloud, and modern frontend technologies.

You will join as a Senior Engineer (Lead Engineer) responsible for rebuilding and modernising a mission-critical insurance platform, with a strong focus on improving core architecture and refactoring legacy systems.

What you will be responsible for:

• Break down monolithic legacy systems into scalable, cloud-native, autonomous services with resilience and self-healing capabilities
• Redesign and implement business rules, workflows, and UI behaviour using modern frameworks and architectures
• Build, validate, and refine AI-generated outputs such as code, specifications, tests, and workflows, ensuring correctness, safety, and performance
• Own end-to-end system behaviour including APIs, data flows, domain logic, and integrations, while applying secure-by-design principles and strong engineering patterns

Your experience:

• Strong backend engineering expertise in Java (and ideally one additional ecosystem such as TypeScript or Python) with deep understanding of concurrency, performance, and distributed systems
• Design and build resilient Spring Boot microservices with a focus on scalability, observability, and reliability
• Develop modern frontend applications using React and TypeScript, with strong foundations in state management and API integration
• Design clean, versioned, contract-driven APIs and build robust testing strategies including integration, contract, and async system testing
• Evaluate and refine AI-generated code while simplifying complex legacy systems, improving architecture, and operating effectively across ambiguous, large-scale system design challenges