Performance Tester with Java Exp-4

Realign Llc; St. Louis (MO); On-site; USD 90,000 - 120,000; Full time

Job summary

Realign Llc is seeking a Performance Tester with Java expertise to join the on-site team in St. Louis, MO. The role focuses on defining SLOs and performance budgets, and championing comprehensive tracing strategies across distributed services.

The ideal candidate will have hands-on experience with JVM tuning, heap/thread analysis, and capacity modeling in cloud environments, driving performance improvements and reliable systems.

Qualifications

• Experience as Performance Tester focusing on Java applications.
• On-site role in St. Louis, MO.
• Full-time employment (FTE).

Responsibilities

• Define SLOs, latency/throughput targets across services.
• Architect tracing strategies (Dynatrace, AWS X-Ray).
• Analyze application and cloud behavior with deep-dive profiling.
• Review architectures for performance risks and bottlenecks.
• Lead root-cause analysis for production incidents.
• Develop capacity models and baselines for cloud services.

Skills

Java

Performance testing

JVM tuning

Thread/heap debugging

GC optimization

Deep-dive profiling

Heap dumps

Dynatrace

AWS X-Ray

JMeter/Gatling

Tools

Dynatrace

AWS X-Ray

PCF

Docker

Kubernetes

Job description

Job Type: Full Time

Job Category: IT

Job Description

Role – Performance Tester with Java Exp
Location – St. Louis, MO (On-site)
FTE

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

Required Skills

JAVA Developer