Sr. COBOL / Java / Spring Batch Developer

This is a remote position. Location: Remote Summary: Keystone AI is assisting our client with hiring a Senior COBOL / Java / Spring Batch Developer to support a large-scale federal modernization initiative. Our client is a specialized government contractor supporting defense financial systems modernization, focused on transforming legacy mainframe applications into modern, scalable, and maintainable Java-based architectures. What You Will Do As a Senior COBOL / Java / Spring Batch Developer, you will support the analysis, conversion, and modernization of complex legacy mainframe systems into a modern Java environment. You will work closely with technical and functional stakeholders to translate business logic from COBOL into Java/Spring Batch, ensuring functional equivalence, improved performance, and alignment with modern development standards. Your work will directly contribute to a multi-phase effort to modernize critical financial systems and reduce technical debt. Responsibilities Analyze and interpret complex COBOL codebases and translate business logic into Java applications Design, develop, and implement batch-processing solutions using Java and Spring Batch Support automated code conversion efforts and validate functional equivalence of converted systems Refactor legacy logic into modular, maintainable, and scalable Java-based solutions Troubleshoot production issues and perform root cause analysis across legacy and modern systems Collaborate with system analysts, data architects, testers, and subject-matter experts Ensure adherence to coding standards, security requirements, and documentation practices Support integration of modernized code into enterprise systems and future microservices architecture Required Qualifications Bachelor’s or Master’s Degree in Computer Science, Information Technology, or related field Minimum of 10 years of experience in software development with strong expertise in COBOL and Java Hands-on experience with Spring Batch for enterprise batch processing Experience working with z/OS and JCL in mainframe environments Proven ability to analyze, maintain, and modernize legacy mainframe applications Strong troubleshooting and debugging experience across complex systems Strong written and verbal communication skills U.S. Citizenship required, Active DoD Secret clearance required Preferred Qualifications Experience supporting large-scale legacy system modernization efforts Familiarity with mainframe technologies such as DB2, VSAM, IDMS, or similar systems Experience with microservices architecture and modern application design patterns Experience working within federal or DoD environments Originally posted on Himalayas