Java Backend Developer

Quantum Technologies. LLC; Austin (TX); On-site; USD 110,000 - 170,000; Full time

Job summary

Quantum Technologies. LLC is seeking a skilled Java Backend Developer to design, develop, and maintain scalable backend applications and RESTful services using Java 8/11/17 and Spring Boot.

The role requires hands-on experience with JPA, Hibernate, and microservices, plus SQL databases and CI/CD practices. You will work with cross-functional teams to deliver enterprise-grade software and ensure performance and reliability.

Qualifications

• Strong experience in Core Java, collections, multithreading, and exception handling.
• Hands-on with Spring Boot, Spring MVC, and Spring Data JPA.
• Knowledge of Hibernate ORM concepts.
• Experience with REST API development and integration.
• SQL knowledge with MySQL, PostgreSQL, Oracle, or SQL Server.
• Familiarity with Maven or Gradle.
• Experience with Git.
• Understanding of Microservices Architecture.
• Experience with JUnit, Mockito, and API testing tools like Postman.
• Knowledge of security concepts: Spring Security, JWT, and OAuth2.

Responsibilities

• Design, develop, and maintain backend applications using Java 8/11/17 and Spring Boot.
• Develop RESTful APIs and microservices following industry best practices.
• Implement data access layers using JPA and Hibernate ORM.
• Optimize database queries and improve application performance.
• Design and maintain relational database schemas.
• Integrate third-party APIs and external systems.
• Write clean, maintainable, and testable code.
• Perform unit testing and integration testing.
• Troubleshoot production issues and provide timely resolutions.
• Collaborate with cross-functional teams including frontend developers, QA, DevOps, and product managers.
• Participate in code reviews and enforce coding standards.

Skills

Core Java

Spring Boot

JPA

Hibernate

REST APIs

SQL

Maven

Gradle

Git

Microservices

Spring Security

JWT

OAuth2

Tools

Postman

JUnit

Mockito

Docker

Kubernetes

Job description

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

We are seeking a skilled Java Backend Developer with strong expertise in Spring Boot, JPA, and Hibernate to design, develop, and maintain scalable backend applications and RESTful services. The ideal candidate should have hands-on experience building enterprise-grade applications, integrating databases, and implementing high-performance microservices.

Key Responsibilities:

• Design, develop, and maintain backend applications using Java 8/11/17 and Spring Boot.
• Develop RESTful APIs and microservices following industry best practices.
• Implement data access layers using JPA (Java Persistence API) and Hibernate ORM.
• Optimize database queries and improve application performance.
• Design and maintain relational database schemas.
• Integrate third-party APIs and external systems.
• Write clean, maintainable, and testable code.
• Perform unit testing and integration testing.
• Troubleshoot production issues and provide timely resolutions.
• Collaborate with cross-functional teams including frontend developers, QA, DevOps, and product managers.
• Participate in code reviews and enforce coding standards.

Required Skills:

• Strong experience in Core Java, Collections, Multithreading, and Exception Handling.
• Hands-on experience with Spring Boot, Spring MVC, and Spring Data JPA.
• Strong knowledge of Hibernate and ORM concepts.
• Experience with REST API development and integration.
• Knowledge of SQL and databases such as MySQL, PostgreSQL, Oracle, or SQL Server.
• Familiarity with Maven or Gradle build tools.
• Experience with Git version control.
• Understanding of Microservices Architecture.
• Experience with JUnit, Mockito, and API testing tools like Postman.
• Knowledge of security concepts such as Spring Security, JWT, and Oauth2.

Preferred Skills:

• Experience with Docker and Kubernetes.
• Exposure to cloud platforms such as AWS, Azure, or GCP.
• Knowledge of messaging systems like Kafka or RabbitMQ.
• Familiarity with CI/CD pipelines using Jenkins, GitHub Actions, or Azure DevOps.

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.