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Get AI-powered advice on this job and more exclusive features. Direct message the job poster from DivIHN Integration Inc Project Overview: We are seeking a highly qualified Senior Platform Developer with deep expertise in Mainframe technologies to support the enhancement, maintenance, and modernization of enterprise-level systems. This role is critical in ensuring the stability, performance, and evolution of legacy applications that underpin essential business operations. The ideal candidate will possess significant experience in COBOL programming , IMS DB/DC , JCL scripting , EZTrieve reporting , and Micro Focus toolsets , and demonstrate a strong understanding of mainframe-based architectures. This position involves close collaboration with multidisciplinary teams, including application architects, infrastructure specialists, and business stakeholders, to deliver high-quality solutions in complex, regulated environments. Key Responsibilities: Mainframe Application Development and Maintenance Design, develop, enhance, and maintain mainframe applications utilizing COBOL , IMS DB/DC , and EZTrieve . Write, manage, and troubleshoot JCL scripts for batch processing and production job execution. Perform code analysis, debugging, and remediation to ensure operational stability and system integrity. System Modernization and Integration Support the re-platforming and re-hosting of legacy applications using Micro Focus Enterprise Developer and Server environments. Assist in code migration, system integration, and testing for mainframe-to-open-system transformation initiatives. Performance Engineering and Optimization Conduct root cause analysis and performance tuning of legacy systems, jobs, and databases. Optimize IMS databases and application throughput to meet SLAs and business performance benchmarks. Technical Documentation and Governance Produce and maintain comprehensive technical documentation, including system design specifications, program logic, batch workflows, and operational guides. Ensure compliance with organizational standards, security protocols, and quality assurance frameworks. Cross-Functional Collaboration and Leadership Collaborate with QA analysts, business analysts, and project managers to define and deliver application functionality aligned with business needs. Provide technical mentorship to junior developers and conduct peer reviews to ensure adherence to best practices. Required Qualifications: Minimum of 10 years of hands-on experience in mainframe application development and support. COBOL (batch and online) IMS DB/DC (hierarchical database and transaction control) MFS (message format services JCL (Job Control Language) advanced batch scripting EZTrieve data extraction, ad-hoc reporting, and formatting Demonstrated experience with VSAM, GDG, sequential datasets, and mainframe utility tools. Familiarity with version control/change management tools (e.g., Endevor, Changeman, ISPW). Experience with version control tools. Experience with system performance benchmarking or load testing of mainframe jobs. Proficiency in debugging tools such as Xpediter, File-AID, or equivalent. Preferred Qualifications: Exposure to CICS, DB2, or REXX scripting. Experience in large-scale system migration, modernization, or re-hosting projects. Understanding of middleware technologies (e.g., MQSeries) and API integration with distributed systems. Knowledge of Agile methodologies, DevOps practices for legacy environments, and SDLC best practices. Bachelors degree in computer science, Information Systems, Engineering, or a closely related discipline. Industry certifications in mainframe development or Micro Focus technologies are highly desirable. Seniority level Seniority level Mid-Senior level Employment type Employment type Contract Job function Job function Information Technology Industries IT Services and IT Consulting Referrals increase your chances of interviewing at DivIHN Integration Inc by 2x Get notified about new Mainframe Developer jobs in Illinois, United States . Business Analyst -- Algorithms Developer Springfield, IL $93,000.00-$105,000.00 3 days ago Benefit Configuration Business Analyst IV Chicago, IL $170,000.00-$190,000.00 3 months ago Chicago, IL $170,000.00-$190,000.00 3 months ago Senior Software Engineer, Backend - Fintech Chicago, IL $170,000.00-$210,000.00 2 weeks ago Chicago, IL $75,000.00-$150,000.00 2 weeks ago Chicago, IL $105,000.00-$215,000.00 2 weeks ago Senior Backend Software Developer (Remote) Senior Backend Software Developer (Remote) Chicago, IL $140,000.00-$175,000.00 1 week ago Oak Brook, IL $106,000.00-$134,000.00 1 day ago Senior Backend Software Developer (Remote) Were unlocking community knowledge in a new way. Experts add insights directly into each article, started with the help of AI. #J-18808-Ljbffr