Performance tester with java

Job Title- Performance Tester with java

Location- St, Louis, MO Onsite

Fulltime/Permanent

Roles and Responsibilities

Key Responsibilities

• Define service-level objectives (SLOs), performance budgets, and latency/throughput targets across services.

• Architect and champion comprehensive distributed tracing strategies (Dynatrace, AWS X-Ray, etc.).

• Analyse application, platform, and cloud behaviour using deep-dive techniques such as heap dumps, thread dumps, flame graphs, GC logs, network traces, and storage I/O profiling.

• Review service and system architectures for performance risks (e.g., synchronous hops, excessive dependencies, misconfigured connection pools, poor cache placement).

• Conduct and lead root-cause analysis for performance incidents in production and pre-production environments.

• Develop capacity models and performance baselines for services running across cloud environments.

Areas of Expertise

• Application Layer: Spring Boot internals, JVM tuning, thread/heap management, concurrency debugging, GC optimization

• Container Runtime: PCF, Docker, container resource limits, CPU throttling, memory pressure

• Orchestrators: PCF, Kubernetes, ECS (autoscaling, pod health, scheduling issues)

• Networking: Service-to-service hops, TLS overhead, DNS, routing, load balancer configs (F5, Nginx, ALB/NLB), service mesh performance

• Storage: Latency, IOPS constraints, distributed file system behaviour

• Caching & Middleware: Redis, Hazelcast, NATS, Kafka, RabbitMQ configuration and throughput tuning

• Databases: Connection pool tuning, slow queries, indexing, replication lag

• Cloud Layer: AWS compute/storage/network performance, regional latency, cross-cloud traffic patterns