Core Java Developer

Ethereum Technologies; Columbus (OH); On-site; USD 90,000 - 130,000; Full time

Job summary

Ethereum Technologies in Columbus, OH is seeking an experienced Core Java Developer to join onsite. You will design and implement high-performance backend systems using Core Java, Spring Boot, and REST APIs, with a focus on multithreading, concurrency, and scalable data structures.

The role requires hands-on expertise, JPMC experience is preferred; relocation or local availability is required. You will collaborate with cross-functional teams in an Agile environment and contribute to production

Qualifications

• Hands-on Core Java development experience (Java 8+).
• Strong knowledge of OOP, collections, exceptions, generics, and concurrency.

Responsibilities

• Develop and maintain high-performance backend apps in Core Java.
• Build REST APIs and microservices using Spring Boot.
• Optimize performance, troubleshoot production systems.
• Write efficient SQL queries and work with relational DB.
• Participate in code reviews, unit testing, and Agile processes.
• Collaborate with cross-functional teams on enterprise applications.

Skills

Core Java

Multithreading

Concurrency

OOP

Design patterns

Spring Framework

Spring Boot

REST APIs

SQL

Unit testing

Git

Maven/Gradle

Problem-solving

Tools

Docker

Kubernetes

Jenkins

Hibernate

Job description

US Citizen, Green Card, H-1B, OPT-EAD, CPT, Other

Job Description:

We are seeking an experienced Core Java Developer for an onsite opportunity in Columbus, Ohio. The ideal candidate will have strong hands-on expertise in Core Java, multithreading, concurrency, data structures, algorithms, and enterprise backend application development. Previous experience working at JPMorgan Chase (JPMC) is strongly preferred or required, depending on client guidelines.

Key Responsibilities:

• Develop and maintain high-performance backend applications using Core Java.
• Apply object-oriented programming, collections, multithreading, concurrency, and design patterns.
• Build and maintain REST APIs and microservices using Spring Boot.
• Optimize application performance, troubleshoot issues, and support production systems.
• Work with relational databases and write efficient SQL queries.
• Participate in code reviews, unit testing, debugging, and Agile development activities.
• Collaborate with cross-functional teams to deliver reliable enterprise applications.

Required Skills :

• Strong hands-on experience with Core Java, preferably Java 8 or later.
• Excellent knowledge of OOP, collections, exception handling, generics, and concurrency.
• Experience with multithreading, synchronization, and JVM performance tuning.
• Strong understanding of data structures, algorithms, and design patterns.
• Experience with Spring Framework, Spring Boot, and REST APIs.
• SQL and relational database experience.
• Familiarity with Git, Maven/Gradle, and unit testing frameworks.
• Strong analytical and problem-solving skills.

Preferred Qualifications :

• Previous employment or project experience at JPMorgan Chase (JPMC).
• Banking or financial services domain experience.
• Exposure to Kafka, messaging systems, distributed systems, and transaction processing.
• Experience with CI/CD, Docker, Kubernetes, or cloud platforms.

Mandatory Candidate Requirements

• Must be available to work onsite from Day 1 in Columbus, OH.
• Must confirm relocation or local availability before submission.
• Must demonstrate strong hands-on Core Java development skills.
• Prior JPMC experience should be verified, including project details and employment dates, if required by the client.

We are an equal opportunity employer. All aspects of employment including the decision to hire, promote, discipline, or discharge, will be based on merit, competence, performance, and business needs. We do not discriminate on the basis of race, color, religion, marital status, age, national origin, ancestry, physical or mental disability, medical condition, pregnancy, genetic information, gender, sexual orientation, gender identity or expression, national origin, citizenship/ immigration status, veteran status, or any other status protected under federal, state, or local law.