Top Java Developer Jobs in Sydney

Develop and support scalable cloud-native, full-stack Java applications in a telecom environment. Responsibilities include application development across the SDLC, real-time Kafka and NiFi data pipelines, Camunda BPMN workflows, database solutions, cloud-native deployments, production support, ITSM integration, and collaboration with globally distributed teams.

Designs and maintains automated testing frameworks for margin trading and risk systems using Java and/or Rust. Responsibilities include test planning, environment management, black-box and white-box testing, security and performance testing, defect analysis, and validation of complex trading workflows, margin calculations, liquidation processes, and high-concurrency distributed systems.

Lead Java development using Java 8+, Spring Boot, RESTful APIs, and microservices. The role requires strong SQL and relational database knowledge, Git proficiency, and advanced problem-solving and debugging abilities. Candidates should have 5–10 years of professional experience.

Design, build, and operate Java backend services, REST APIs, compliance capabilities, and analytics products. Develop blockchain data pipelines, model relational and NoSQL data, optimize queries, and improve production reliability, observability, and performance. Translate regulatory requirements into technical solutions while collaborating with compliance and product specialists. The role may also involve AWS infrastructure, Kafka, crypto integrations, and AI-assisted development tools.

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

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.

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 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, 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.