Java Backend Specialist

Core Technical Skills

Evaluate the candidate's depth in:

• Core Java (Java 8/11/17+ features)
• Spring Boot and Spring ecosystem
• Microservices architecture
• REST APIs, messaging (Kafka/RabbitMQ), and event-driven architecture
• SQL/NoSQL databases and data modelling
• Cloud platforms (AWS/Azure/GCP) and containerization (Docker/Kubernetes)

Deep Java Assessment

Validate strong understanding of:

• Concurrency & Multithreading
  • Thread lifecycle, synchronization, locks, Executors, Completable Future
  • Concurrent Collections and thread-safe programming
  • Race conditions, deadlocks, and their mitigation
• Performance & Optimization
  • JVM memory model, heap/non-heap memory
  • Garbage Collection concepts and tuning basics
  • Profiling, memory leaks, CPU optimization
  • Performance bottleneck identification and resolution
• Time & Space Complexity
  • Analyse algorithm complexity (Big O notation)
  • Selection of appropriate data structures
  • Optimizing code for scalability and efficiency
• Collections & Java Internals
  • Internal working of HashMap, Concurrent HashMap, HashSet
  • equals() vs hash Code()
  • String, StringBuilder, String Buffer
  • Serialization and Java memory management
• Design Principles
  • SOLID principles
  • Design patterns (Factory, Strategy, Singleton, Observer, etc.)
  • Clean Code and best practices

Architecture & System Design Understanding

Assess the candidate's ability to understand:

• Design scalable, resilient, and secure enterprise applications
• Define microservice boundaries and communication patterns
• Handle scalability, high availability, and fault tolerance
• Apply caching, messaging, asynchronous processing, and resiliency patterns
• Make architecture and technology decisions with clear trade-offs

Technical Leadership

Evaluate whether the candidate can:

• Lead technical discussions and design reviews
• Mentor and guide development teams
• Review code and enforce engineering best practices
• Drive technical decision-making and resolve complex production issues
• Collaborate effectively with architects, product owners, and business stakeholders

Interview Focus

• Prioritize architecture, deep Java expertise, system design, performance optimization, and technical leadership over coding alone.
• Look for candidates who can own end-to-end solution design, troubleshoot complex issues, and lead technical initiatives.

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Core Java, Java Concurrency, Multithreading

optimization, architecture, system design