Top Java Developer Jobs in Sydney

Design, develop, and maintain high-performance backend systems for a Web3 Wallet DEX. Apply blockchain technology, contribute to technical architecture, improve system reliability and scalability, and introduce innovative solutions. The role requires Java development, distributed systems expertise, MySQL performance tuning, and collaboration in a fast-paced team.

Develop and maintain server-side Java applications for a financial markets exchange. Responsibilities include implementing bug fixes and feature enhancements, refactoring legacy code, adopting current technologies and development practices, and providing development support to the business. The role also includes some front-end development and requires collaboration with business 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.

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 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 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, 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, 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.

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.

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, 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.