Top Java Developer Jobs in Sydney

Design and implement complex backend services for Binance Square. Collaborate with product, DevOps, and QA to deliver high-quality microservices, promote engineering best practices, and perform code reviews.

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

Design, implement, and operate developer-facing backend systems and tooling to improve Python and Java workflows. Build CI/CD, monorepo build systems, self-service platforms, automation, monitoring, and telemetry. Partner with platform and backend teams, drive projects end-to-end from design to rollout, and mentor engineers to reduce friction and improve developer productivity at scale.

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.

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.

Design, implement, and maintain backend services in Java that power scalable user experiences. Collaborate with PMs, designers, and frontend engineers to deliver features, improve performance and reliability, write tests, enhance observability, fix bugs, and continuously learn through mentorship and feedback.

Design, build, and maintain scalable, highly available backend services in Java. Own backend architecture, optimize performance, develop APIs and integrations, support production, conduct code reviews, and contribute to AI engineering tools and infrastructure.

Design, build and maintain Java-based automated test frameworks and CI/CD pipelines. Plan and execute automated and manual tests (API, integration, system, regression, end-to-end), validate market data and order flow, manage test environments and data, log and investigate defects, and collaborate with developers, BAs and stakeholders to support safe release promotion.

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.

Administer, monitor, and support Java applications and Genesys Cloud. Provide production troubleshooting, minor bug fixes and enhancements, and act as primary POC for Java apps. Develop/support microservices using Java and Spring Boot, perform analysis of system behavior, and apply problem-solving and diagnostics to maintain service quality.

Design and execute load, stress, scalability, and reliability tests. Analyze Java application and JVM performance, identify bottlenecks, implement architecture- and code-level optimizations, troubleshoot production microservice performance, build automated performance tooling, and collaborate with DevOps to ensure high availability.

Develop, implement, and support enterprise software using Java/Spring Boot and Angular. Collaborate with product and agile teams to design, code, test, review and deploy microservices and APIs, provide production support, document artifacts, and ensure scalability, performance and adherence to architecture and best practices.

Design and build cloud-native full-stack applications, own technical decisions and architecture, improve CI/CD/observability, lead incident response, mentor engineers, and drive adoption of AI-assisted engineering to improve quality and delivery.

Design, implement, test, and deploy Java-based product applications. Collaborate with business analysts and customers to clarify requirements, write unit tests and deployment scripts, perform release testing, document solutions, assist with client issues, and mentor teammates while using modern containerized development toolchains.

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.

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.

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, 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.

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.

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.