Competencies: 6+ years experience required
Digital : Amazon Web Service(AWS) Cloud Computing
Advanced Java Concepts
Microsoft SQL Server 2019
Java Performance Tools (Jprobe, Jensor, OptimizeIT)
Must Have TechnicalFunctional Skills:
JDK Migration & Compatibility Management
JVM Memory Management & Heap Right-Sizing
Garbage Collection Tuning (ZGCG1GCShenandoah)
Java & JVM Internals
Performance Monitoring & Troubleshooting
Roles & Responsibilities:
Plan and execute JDK version migrations (JDK 17 to 21, JDK 21 to 25) across service fleets: identifying and resolving blockers including deprecatedremoved APIs, module system incompatibilities, reflection access restrictions, security provider changes, and build system (bootstraptoolchain) compatibility issues.
Perform heap right-sizing analysis for Java services: profiling heap utilization patterns, analyzing logs, identifying over-provisioned heap allocations, and implementing optimal XmsXmxmetaspace configurations that minimize DRAM consumption while preserving service performance SLAs.
Evaluate and implement new algorithms and JVM features introduced in target JDK versions (e.g., Zgenerational mode, Shenandoah improvements, compact object headers) to achieve memory efficiency gains beyond simple heap tuning.
Perform custom operations and iterative experiments using Amazon internal tooling to validate optimization impact: own end-to-end deployment, test execution, metric validation, and derive actionable insights from results.
Troubleshoot JDK migration issues including class loading changes, serialization incompatibilities, JNInative library compatibility, and performance regressions introduced by JVM behavioral differences across versions.
Collaborate with service teams to review service architectures, discuss findings, propose migration plans, and align resolution strategies while communicating effectively across engineering leadership and technical stakeholders.
Monitor service health metrics and troubleshoot operational issues during and after migration and heap optimization activities, ensuring zero degradation to service latency, throughput, and availability.
Develop comprehensive operational runbooks, SOPs, documentation, and technical specifications that capture JDK migration patterns and heap optimization strategies, consumable by both human engineers and AI agents to orchestrate workflows at scale.
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