Core Java Developer

Job Description:

About the Role

• We are seeking a skilled Core Java Developer to design, develop, test, and maintain high-performance, scalable, and reliable Java applications.

• The ideal candidate will have a strong foundation in core Java concepts, object-oriented programming, multithreading, data structures, design patterns, and enterprise application development.

• The successful candidate will collaborate with architects, developers, QA engineers, DevOps teams, product managers, and business stakeholders to deliver high-quality software solutions.

 

Key Responsibilities

• Design, develop, and maintain applications using Core Java.

• Write clean, efficient, reusable, and maintainable code.

• Apply object-oriented programming principles and software design patterns.

• Develop multithreaded, concurrent, and high-performance applications.

• Work with Java collections, exception handling, generics, streams, and lambda expressions.

• Build and consume RESTful web services and APIs.

• Develop modular and scalable application components.

• Implement business logic, validation, error handling, and transaction management.

• Work with relational and NoSQL databases.

• Write efficient SQL queries and optimize database interactions.

• Perform unit, integration, functional, and regression testing.

• Troubleshoot application issues, memory leaks, performance bottlenecks, and production defects.

• Participate in code reviews and ensure adherence to coding standards.

• Collaborate with cross-functional teams to understand requirements and deliver solutions.

• Contribute to technical design documents and implementation plans.

• Integrate applications with CI/CD pipelines.

• Support application deployment, monitoring, and production issue resolution.

• Participate in Agile ceremonies, sprint planning, daily stand-ups, reviews, and retrospectives.

• Stay current with Java releases, development practices, tools, and industry trends.

 

Required Qualifications

• Bachelor’s degree in Computer Science, Engineering, Information Technology, or a related field.

• 10+ years of experience in Java software development.

• Strong knowledge of Core Java, including:

• Object-oriented programming

• Collections framework

• Exception handling

• Generics

• Multithreading and concurrency

• Java I/O and NIO

• Streams and lambda expressions

• Java memory management

• Garbage collection

• Experience with Java 8 or later.

• Strong understanding of data structures, algorithms, and design patterns.

• Experience developing RESTful APIs and backend services.

• Knowledge of relational databases such as Oracle, SQL Server, MySQL, or PostgreSQL.

• Experience with SQL, JDBC, and ORM concepts.

• Familiarity with Maven or Gradle.

• Experience with Git or other version-control systems.

• Understanding of unit testing using JUnit, Mockito, or equivalent tools.

• Familiarity with Agile/Scrum development methodologies.

• Strong analytical, debugging, communication, and problem-solving skills.

 

Preferred Qualifications

• Experience with Java 11, 17, 21, or later.

• Experience with Spring, Spring Boot, Spring MVC, Spring Data, or Spring Security.

• Knowledge of microservices architecture.

• Experience with messaging technologies such as Kafka, RabbitMQ, JMS, or ActiveMQ.

• Familiarity with Docker and Kubernetes.

• Experience with cloud platforms such as AWS, Azure, or Google Cloud.

• Knowledge of CI/CD tools such as Jenkins, GitHub Actions, GitLab CI, or Azure DevOps.

• Experience with NoSQL databases such as MongoDB, Redis, Cassandra, or DynamoDB.

• Familiarity with distributed systems, caching, and event-driven architecture.

• Experience with application monitoring and observability tools.

• Knowledge of secure coding practices and application security.

• Experience with performance testing and profiling tools.

• Familiarity with Linux/Unix environments and shell scripting.

 

Technical Skills

Core Java

• Java SE

• Object-oriented programming

• Collections and generics

• Multithreading and concurrency

• Streams and lambda expressions

• Exception handling

• Java I/O and NIO

• JVM architecture

• Memory management and garbage collection

• Serialization and reflection

• Data structures and algorithms

 

Backend Development

• RESTful APIs

• HTTP and JSON

• JDBC

• Spring and Spring Boot

• Microservices

• Authentication and authorization

• Transaction management

• Service integration