Senior Java Developer - Java 21 Migration (4 month contract)

Lead the migration of a large-scale Java 8 application to Java 21 LTS. Deep hands-on experience with AWS services are a must eg Serverless, CodeDeploy You’ll modernize the codebase, upgrade dependencies, optimize performance, and introduce new Java features where they add value. This is a hands-on role focused on safe migration, testing, and production readiness.

Key Responsibilities

• Plan and execute migration from Java 8 to Java 21.
• Upgrade build tools (Maven/Gradle) and CI/CD pipelines.
• Modernize code using Java 21 features (records, pattern matching, virtual threads).
• Update tests to JUnit 5 and improve coverage.
• Optimize performance and tune JVM/GC settings.
• Ensure security compliance and observability in production.

Skills and Experience

• 5+ years of Java development experience.
• Strong knowledge of JVM internals, concurrency, and performance tuning.
• Experience with Maven/Gradle, CI/CD, and containerized deployments.
• Familiarity with Java 21 features and migration best practices.
• Hands-on with JUnit 5, static analysis tools, and profiling.
• Experience with AWS server less, AWS Opensearch, AWS DynamoDB, Distributed caching , AWS CodeCommit, AWS CodeDeploy, AWS CodePipeline, Cloudformation and GitHub for source control and CI/CD workflows.
• Proven experience in designing and developing microservices and RESTful APIs.
• Strong experience with Spring and Spring Boot frameworks.

Hybrid setup with a split between work from home and office time (days set by team collaboration days in the office).

4 month contract with a chance of extension.

Aboriginal and Torres Strait Islander Peoples are encouraged to apply. To apply please click apply or call Paolo Paparo on 02 8289 3150 for a confidential discussion.