Core Java Developer / Lead

Centillion Infotech LLC; California (MO); On-site; USD 140,000 - 190,000; Full time

Job summary

Centillion Infotech LLC in Alpharetta, GA, and Menlo Park, CA, seeks a Sr. Core Java Developer / Lead to design, develop, test, and maintain high-performance Java applications.

You will lead technical tasks, mentor juniors, and collaborate with cross-functional teams to deliver scalable software solutions. The role requires 10+ years of Java experience, strong core Java fundamentals, RESTful APIs, multithreading, and familiarity with Spring, databases, and CI/CD pipelines.

Qualifications

• 10+ years of experience in Java software development.
• Bachelor's degree in Computer Science, Engineering, Information Technology, or related field.
• Strong knowledge of Core Java, including object-oriented programming, collections, multithreading, and memory management.
• Experience developing RESTful APIs and backend services.
• Familiarity with relational databases and SQL/JDBC.
• Experience with Maven/Gradle and Git.
• Understanding of unit testing using JUnit/Mockito.
• Knowledge of Agile/Scrum methodologies.

Responsibilities

• Design, develop, and maintain applications using Core Java.
• Write clean, efficient, reusable, and maintainable code.
• Develop multithreaded, high-performance applications.
• Build and consume RESTful web services and APIs.
• Collaborate with cross-functional teams and participate in code reviews.
• Integrate applications with CI/CD pipelines and deployment processes.
• Troubleshoot performance issues, memory leaks, and production defects.

Skills

Core Java

Multithreading

RESTful APIs

JVM tuning

Maven/Gradle

SQL/JDBC

Git

Unit testing

Linux/Unix

Design patterns

Education

Bachelor's degree in CS or related

Tools

Spring Framework

Spring Boot

Docker

Kubernetes

Kafka

Jenkins

AWS

Job description

Sr. Core Java Developer / Lead for Alpharetta, GA / Menlo Park, CA

Job Id: JR1042525

Need Local Profiles only.

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