Senior Core Java Backend Developer-Java, Spring Boot

Rose International; Jersey City (NJ); On-site; USD 140,000 - 170,000; Full time

Job summary

Rose International is seeking an accomplished Core Java Developer for an onsite role in Jersey City. The candidate should have 10+ years of enterprise Java experience, with deep work in Core Java, Jakarta EE, Spring Framework and Spring Boot, plus hands-on RESTful services and distributed systems.

Knowledge of Docker, OpenShift, Kubernetes and CI/CD is essential. This senior position requires collaboration with distributed teams across time zones, designing secure and scalable applications, and

Qualifications

• 10+ years designing and developing enterprise-grade Java systems.
• Deep experience with Core Java, Jakarta EE, Spring Framework, and Spring Boot.
• Experience with RESTful services and distributed systems.
• Experience with Docker, OpenShift, Kubernetes and CI/CD pipelines.

Responsibilities

• Design, develop and maintain enterprise-grade Java-based backend applications.
• Build scalable RESTful services using Core Java, Spring Framework and Spring Boot.
• Develop and maintain event-driven integrations using Apache Kafka and IBM MQ.
• Design and optimize database schemas, SQL queries and PL/SQL procedures.
• Implement secure authentication and authorization using Spring Security.
• Apply resilience patterns, caching strategies and performance optimization techniques.
• Develop automated unit, integration and contract tests to ensure software quality.
• Use AI-assisted development tools to improve coding productivity and workflows.
• Build, deploy and maintain containerized apps using Docker, OpenShift and Kubernetes.
• Implement and maintain CI/CD pipelines and observability.
• Participate in Agile ceremonies and cross-time-zone collaboration.

Skills

Core Java

Java 17/21/25

Jakarta EE

Spring Framework

Spring Boot

RESTful APIs

Apache Kafka

IBM MQ

SQL/PLSQL

OpenShift

Kubernetes

CI/CD

SDLC

Agile

JPA/Hibernate

JUnit/Mockito

Tools

Docker

OpenShift

Kubernetes

Jenkins

Git

GitHub

Maven/Gradle

IntelliJ

Eclipse

Job description

***Only qualified Core Java Developer candidates located near the location specified in the job description are to be considered due to the position requiring an onsite presence***

Required Experience & Knowledge

• 10+ years of relevant experience designing and developing enterprise-grade Java-based systems
• 10+ years of hands-on experience with Core Java, Java 17/21/25 LTS, Jakarta EE (J2EE), Spring Framework 7 and Spring Boot 4.x
• Experience developing RESTful services and working with medium-to-complex distributed systems
• Experience with event-driven architecture using Apache Kafka and IBM MQ
• Experience with relational databases, SQL, PL/SQL, and schema versioning tools such as Flyway or Liquibase
• Experience implementing secure, scalable and resilient enterprise applications
• Experience with Docker, Red Hat OpenShift, Kubernetes and CI/CD pipelines
• Strong understanding of the full Software Development Life Cycle (SDLC) and Agile methodologies
• Experience working with distributed teams across time zones

Required Technical Skills

• Strong knowledge of modern Java language features, JVM internals, garbage collection tuning and performance profiling
• Proficiency in Java 25 preferred, Core Java, Jakarta EE (J2EE), Spring Framework 7 and Spring Boot 4.x
• Expertise in REST API design, OpenAPI/Swagger and high-performance service communication
• Strong knowledge of JPA 2/3, Hibernate 6 and HikariCP connection pooling
• Experience with Spring Security 6+, OAuth 2.0/OIDC, JWT-based authentication, RBAC and ABAC
• Knowledge of Apache Kafka partitioning, consumer groups, idempotency, transactional outbox patterns and IBM MQ
• Experience with Oracle or equivalent databases such as PostgreSQL and MySQL
• Experience with Redis, MongoDB and Elasticsearch, with awareness of vector databases such as Pgvector
• Familiarity with Spring AI, large language model (LLM) integration and retrieval-augmented generation (RAG) workflows is an advantage
• Proficiency with AI-assisted development tools such as Claude, GitHub Copilot, Devin and Cursor
• Experience with JUnit 5, Mockito, AssertJ, Cucumber/Gherkin and Testcontainers
• Knowledge of contract testing tools such as WireMock and Spring Cloud Contract
• Experience with IntelliJ IDEA or Eclipse, Git, Bitbucket, GitHub, Maven/Gradle, JIRA and SonarQube
• Experience with Docker multi-stage builds, Kubernetes deployments, ConfigMaps, Secrets, Ingress and HPA/KEDA autoscaling
• Experience with Jenkins, GitHub Actions, GitLab CI or ArgoCD
• Familiarity with Micrometer, Prometheus, Grafana and distributed tracing tools such as OpenTelemetry, Zipkin or Jaeger

Preferred Experience

• Experience with Java 25 LTS
• Exposure to Spring AI, LLM integrations, RAG workflows and vector databases
• Experience with advanced Kubernetes autoscaling using HPA/KEDA
• Familiarity with modern AI-assisted software engineering tools and practices

Required Soft Skills

• Strong analytical and problem-solving skills
• Ability to learn new tools, frameworks and technologies quickly
• Ability to collaborate effectively with distributed and cross-time-zone teams
• Strong understanding of enterprise design standards, architectural patterns and development best practices

Responsibilities

• Design, develop and maintain enterprise-grade Java-based backend applications
• Build scalable RESTful services using Core Java, Spring Framework and Spring Boot
• Develop and maintain event-driven integrations using Apache Kafka and IBM MQ
• Design and optimize database schemas, SQL queries and PL/SQL procedures
• Implement secure authentication and authorization using Spring Security and modern security standards
• Apply resilience patterns, caching strategies and performance optimization techniques
• Develop automated unit, integration and contract tests to ensure software quality
• Use AI-assisted development tools to improve coding productivity, code review and development workflows
• Build, deploy and maintain containerized applications using Docker, OpenShift and Kubernetes
• Implement and maintain CI/CD pipelines and application observability
• Participate in Agile ceremonies, sprint planning, code reviews and iterative delivery
• Collaborate with cross-functional teams to deliver reliable and maintainable software solutions

Additional Details

• Assignment duration of 1 year with potential conversion to a permanent role
• Candidates must successfully complete the Java Senior Karat assessment before submission unless they have passed the same assessment within the last 6 months
• Only those lawfully authorized to work in the designated country associated with the position will be considered.
• Please note that all Position start dates and duration are estimates and may be reduced or lengthened based upon a client’s business needs and requirements.

About Rose

• Founded in 1993
• Office Locations Across the U.S.
• 150+ Clients: Corporations and Government Agencies
• Employee Oriented Company
• Challenging Assignments Across the U.S.
• Continuous Professional Development

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