Senior Java Messaging Systems Engineer

Overview

This role requires deep expertise in core Java, concurrency, and messaging technologies, along with strong problem-solving skills and the ability to work with large, complex codebases.

Key Responsibilities

• Design, develop, and maintain high-performance Java-based messaging and distributed systems
• Work extensively with multi-threaded, concurrent systems involving locks, synchronization, and JVM internals
• Debug complex production issues, including performance bottlenecks, memory leaks, and system failures
• Analyze and extend large legacy Java codebases with a focus on reliability and maintainability
• Implement and optimize messaging workflows using JMS or other message brokers
• Collaborate with cross-functional teams to ensure system stability, scalability, and correctness
• Participate in code reviews, architectural discussions, and technical documentation
• Engage with open-source communities (e g , Apache) through discussions, reviews, or contributions

Required Technical Skills

• Core Java & Systems
• 5-10 years of hands-on experience with Java
• Strong command of core Java and concurrency concepts
• Deep understanding of: Threads, locks, and synchronization
• Java NIO and socket programming
• File I/O, persistence mechanisms, and journaling
• JVM memory model and garbage collection
• Proven experience debugging distributed or messaging systems
• Messaging & Protocols
• Strong experience with at least one messaging technology:
• JMS, Kafka, RabbitMQ, ActiveMQ, or EMS
• Solid understanding of messaging concepts such as:
• Message delivery semantics (ACKs, transactions, redelivery)
• Message selectors and filtering
• Familiarity with wire-level protocols such as:
• OpenWire, STOMP, MQTT, or similar protocol stacks
• Debugging & Problem Solving
• Excellent ability to read, understand, and enhance large, complex legacy Java systems
• Demonstrated experience diagnosing and resolving production issues and performance problems
• Strong analytical and troubleshooting skills
• Open Source & Communication
• Prior open-source contributions are a strong advantage
• Comfortable working with and communicating in open-source communities, particularly Apache
• Strong written communication skills for technical discussions, documentation, and collaboration

Nice to Have

• Experience working on low-latency or high-throughput systems
• Exposure to distributed system design and fault tolerance patterns
• Familiarity with observability tools (profilers, thread dumps, heap dumps)