Senior Java SRE Engineer — Performance & Scale

Cbase Inc.; Alpharetta (GA); On-site; USD 120,000 - 160,000; Part time

Job summary

Cbase Inc. in Alpharetta, GA is seeking a Senior Java Engineer to optimize performance and troubleshoot production systems at scale. You will work across Java 8–21, databases, containers, Kubernetes, and infrastructure to diagnose bottlenecks and improve efficiency.

The role requires hands-on debugging, deep knowledge of multi-threading, and collaboration with cross-functional teams to deliver resilient, scalable Java applications in a contract engagement (6 months with extension).

Qualifications

• 5+ years of professional Java development experience, preferably supporting large-scale enterprise applications.
• Strong hands-on expertise with Java 8, 11, 17, and 21.
• Deep understanding of Java memory management, JVM behavior, garbage collection, memory leaks, and CPU utilization.
• Strong understanding of multi-threading, concurrency, synchronization, thread safety, and parallel processing.
• Deep knowledge of relational databases and SQL optimization, including indexing, query optimization, connection pooling, locking, and transactions.
• Hands-on experience with Docker/containers and Kubernetes.
• Strong production troubleshooting skills, including log analysis and root cause analysis.

Responsibilities

• Read, debug, refactor, and optimize existing Java applications across Java 8, 11, 17, and 21.
• Diagnose and resolve complex application performance and scalability issues.
• Analyze CPU spikes, memory leaks, high resource utilization, thread contention, and application latency.
• Perform root cause analysis by reviewing application logs, thread dumps, heap dumps, and system metrics.
• Optimize SQL queries and database interactions, including indexes, connection pooling, database locks, and transaction management.
• Analyze application algorithms and identify opportunities to improve time and space complexity.
• Troubleshoot applications operating in distributed and high-volume environments.
• Understand and analyze traffic and data flow across applications, APIs, networks, and load balancers.
• Design and troubleshoot multi-threaded and concurrent Java applications, including thread safety, synchronization, and resource management.
• Work with containerized applications and Kubernetes environments.
• Design and execute performance and load-testing strategies using JMeter, Gatling, or equivalent tools.
• Use profiling tools such as JProfiler, YourKit, or equivalent to identify application-level performance bottlenecks.
• Use monitoring and observability platforms such as Splunk, Dynatrace, AppDynamics, Grafana, or equivalent tools for proactive monitoring and troubleshooting.
• Work with caching technologies such as Redis to improve application performance and scalability.
• Collaborate with development, architecture, infrastructure, database, and production-support teams to resolve complex issues.
• Recommend improvements to application architecture, code quality, scalability, reliability, and performance.

Skills

Java performance tuning

Distributed systems

Concurrency

Thread safety

Root cause analysis

Profiling and diagnostics

Production troubleshooting

Tools

Docker

Kubernetes

JProfiler

YourKit

Redis

SQL optimization

Job description

Cbase Inc. in Alpharetta, GA is seeking a Senior Java Engineer to optimize performance and troubleshoot production systems at scale. You will work across Java 8–21, databases, containers, Kubernetes, and infrastructure to diagnose bottlenecks and improve efficiency.

The role requires hands-on debugging, deep knowledge of multi-threading, and collaboration with cross-functional teams to deliver resilient, scalable Java applications in a contract engagement (6 months with extension).