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Capstone IT Staffing Logo Capstone IT Staffing · IT - Software Development

Senior Java Developer

· Job Posted May 30, 2026
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Job Description

We are seeking a Senior Java Developer with a minimum of 12 years of professional, hands-on Java development experience (15–18 years preferred) to support a large-scale legacy modernization initiative. This role is focused on transforming monolithic applications into microservices-based architectures, as well as supporting the transition from on-premise systems to hybrid cloud environments. The ideal candidate has deep experience modernizing enterprise platforms and building highly scalable, distributed systems. You will work on mission-critical applications as part of a high-performing engineering team, contributing across the full software development lifecycle. This role is onsite, Monday through Friday, and requires a 2nd interview to be completed onsite. A light on call rotation is required every 14-16 weeks after training is completed.

Job Responsibility

  • Lead and contribute to modernization efforts from monolith to microservices architectures
  • Support migration strategies from on-prem systems to hybrid cloud environments
  • Design, develop, and maintain scalable, enterprise-grade applications in distributed environments
  • Write clean, efficient, and testable Java code
  • Participate in architecture, design, development, testing, and deployment
  • Debug, troubleshoot, and resolve production issues
  • Prepare and manage code releases
  • Collaborate with cross-functional teams to deliver technical solutions
  • Contribute to continuous improvement and engineering best practices
  • Experience working in secure enterprise environments

Requirements

  • Java / Core Java (versions 8-17
  • extensive hands-on experience)
  • Spring Framework (Spring Boot, Spring Data, Spring Cloud)
  • Microservices architecture
  • REST API's
  • REST & SOAP web services development
  • JPA2 / Hibernate (HQL, JPQL, Criteria APIs)
  • Object-Oriented Design & Design Patterns
  • Domain Driven Design (DDD) concepts
  • Kafka
  • MongoDB
  • Oracle and SQL Server
  • WebLogic 14+ or similar application servers
  • JUnit, Mockito
  • Tools: Git, Gradle, IntelliJ/Eclipse, Ant, SQL Developer (Oracle 19c)
  • Bachelor's degree in Computer Science or related field (or equivalent experience)
  • Minimum 12 years of hands-on, professional Java development experience (REQUIRED)
  • Proven experience in legacy modernization initiatives, including: Monolith to microservices transformation
  • On-premise to hybrid cloud migration

Nice to have

  • Azure DevOps experience
  • Experience with containerization technologies (Docker, Kubernetes)
  • Familiarity with UI component libraries
  • Agile development experience
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