Core Java Developer

Core Java Developer
Location: Hyderabad (Hybrid)
Experience: 5–10 Years
Work Mode
• Hybrid work model
• Location: Hyderabad
• Willingness to work from office as per hybrid schedule
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About the Role
We are looking for a highly skilled Core Java Developer with a strong foundation in Java internals, concurrency, and distributed systems. This role involves working on complex, performance-critical systems, debugging large legacy codebases, and contributing to messaging or protocol-driven platforms.
The ideal candidate has a product company background, strong problem-solving skills, and an interest in open-source ecosystems.
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Key Responsibilities
• Design, develop, and maintain high-performance Java applications
• Work extensively with core Java concepts including concurrency and JVM internals
• Debug and enhance large, complex legacy Java codebases
• Diagnose and resolve performance issues and production incidents
• Work on distributed systems or messaging platforms
• Collaborate with cross-functional teams to deliver reliable, scalable solutions
• Contribute to technical discussions, design reviews, and documentation
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Required Skills & Experience
Core Java & JVM
• 5–10 years of hands-on experience in Core Java
• Strong expertise in:
o Threads, locks, and synchronization
o Java concurrency utilities
o Java NIO, socket programming
o File I/O, persistence mechanisms, journaling
o JVM memory model, garbage collection, and memory tuning
Distributed Systems & Debugging
• Experience debugging distributed systems or messaging-based platforms
• Proven ability to diagnose performance bottlenecks and production failures
• Strong capability to read, understand, and extend large legacy Java codebases
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Messaging & Protocols
(Expertise in at least one area is required)
• Hands-on experience with JMS or message brokers such as:
o Kafka
o RabbitMQ
o ActiveMQ
o EMS
• Understanding of message delivery semantics:
o Acknowledgements (ACK)
o Transactions
o Redelivery
o Message selectors
• Familiarity with wire protocols such as:
o OpenWire
o STOMP
o MQTT
o or similar protocol stacks
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Preferred Qualifications
• Prior open-source contributions (especially Apache ecosystem)
• Strong written communication skills for engaging with open-source communities
• Background from a Tier-1 university
• Medium to long-term experience in good product-based companies

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