Top Java Developer Jobs in Sydney

Design, develop, and maintain high-performance, secure Java backend services and APIs. Ensure reliability, scalability, and cost-efficiency across microservices, databases, messaging systems, and capacity planning. Troubleshoot, profile, benchmark, and optimize systems (including ML applications) and collaborate with Kazakhstan stakeholders.

Design, build, and evolve core backend frameworks, shared services, and developer APIs to accelerate product development. Deliver scalable, maintainable systems, improve observability and rollout processes, collaborate with product teams, and mentor engineers to raise engineering standards across the platform.

Contribute to design, development, and maintenance of real-time risk control and decisioning services. Implement risk rules, scoring models, and feature pipelines for fraud, AML, and account security. Troubleshoot issues, write technical documentation, and collaborate with Risk Operations and CS teams to investigate cases and improve systems.

Design, build, and maintain efficient, reusable Java backend systems; translate business requirements into applications; optimize performance and stability; review and test code for quality and security; identify and fix bottlenecks and bugs; maintain code quality and system responsiveness.

Join the Futures QA Automation team to design and execute test plans across web, desktop, and mobile. Develop and run automated, performance, security, and mobile-specific tests; set up testing environments (Node.js, Java, Go, Python, local blockchain); diagnose root causes; collaborate with engineers, PMs, designers, and operations to improve quality and processes.

Design, build, and scale high-performance Java backend services for Canva's User Platform. Work on authentication, user management, reusable platform components, partner with stakeholders, join on-call rotations, and improve enterprise and education user experiences.

Design, build, and scale high-performance Java backend systems for Canva's User Platform. Collaborate on microservices to authenticate, authorize and manage users, groups and teams; optimise AWS resources; deliver features for Enterprise and Education customers; work with stakeholders to align requirements and timelines and improve scalability and performance.

Design, build, and own core authorization and access control systems (SpiceDB-backed); drive adoption and integrations across product teams; deliver high-availability backend services; partner with Security and API Platform; shape identity and access models for AI workflows; mentor engineers on system design and IAM best practices.

Design and build Java backend systems for on-chain payment flows, integrating wallets, broadcasting and tracking transactions, connecting banking channels to on-chain liquidity, ensuring reliability, idempotency, and handling chain edge cases.

Lead QA automation for Futures across web, desktop, and mobile: design and execute test plans, set up test environments, write automated tests, perform security and performance testing, root-cause analysis, and improve testing processes across the SDLC.

Design and build backend microservices for real-time fraud detection, transaction monitoring, and risk analysis. Integrate ML models and risk scoring engines, support scalable distributed systems, and leverage AI-assisted development and LLM/agent tools for risk automation.

Senior QA Automation Engineer responsible for designing, building, and maintaining Rust/Java-based automated test frameworks. Participate across the SDLC to create test plans, execute black-/white-box, security, performance, and mobile testing, diagnose root causes, and improve testing processes. Collaborate with engineers, PMs, designers, and operations to ensure system reliability across web, desktop, and mobile platforms. Apply AI models in testing where applicable and coordinate with global stakeholders in English and Mandarin.

Design, develop, and optimize high-performance Java backend systems. Contribute to architecture, implement core modules, troubleshoot production issues, perform code reviews, and improve scalability, availability, and reliability of distributed financial or blockchain systems.

Design and develop scalable software solutions, collaborate with team members, and ensure highest quality standards through best practices in software development.

Design and build scalable, reliable backend services in Java; collaborate with PMs, designers, and frontend engineers to deliver features end-to-end; improve architecture, performance, observability, and incident resilience; write well-tested production code; lead design and code reviews, mentor peers, and participate in on-call rotations.

Build and maintain scalable backend services and APIs in Java. Design and implement features, improve system performance and reliability, write tests and observability hooks, collaborate with product, design and frontend teams, and use AI tools to augment development. Expect mentorship and evolving responsibilities in a hybrid Sydney-based role.

Design, develop and deploy server-side components and real-time data feeds using Java/J2EE/EJB. Ensure database performance, reliability, security and availability. Develop, monitor and optimize EJB and other server-side components while following SDLC practices and contributing to system architecture.

The Senior Backend Engineer will develop distributed web applications, mentor other engineers, and lead complex architectural changes for Canva's products.

The Senior Software Engineer will build APIs and tools, improve production systems, reduce technical debt, mentor others, and work on both backend and frontend code.

Design, implement, and maintain backend systems for a centralized exchange (CEX). Lead architecture and development of payment systems, trading matching engines, real-time compute and middleware platforms. Drive technical reviews, troubleshooting, refactoring, and mentoring to ensure system stability, performance, and engineering standards.

Develop and maintain Java backend services for enterprise blockchain applications, integrate APIs with React/Vue frontends, design scalable blockchain solutions, troubleshoot complex backend issues, and collaborate with cross-functional teams while staying current with blockchain best practices.

Optimize and scale blockchain node performance, design and implement core system plugins, collaborate with cross-functional teams, perform performance testing and debugging, and stay current with blockchain infrastructure trends.