Senior Mainframe Application Developer

Infinite Computer Solutions; United States; On-site; USD 120,000 - 170,000; Full time

Job summary

Infinite Computer Solutions is seeking a Senior Mainframe Application Developer to design, develop, and maintain enterprise-grade mainframe applications on IBM z/OS. You will collaborate with cross-functional teams to drive modernization initiatives and leverage AI-enabled tools to accelerate delivery and documentation.

Key responsibilities include designing and enhancing COBOL programs, managing JCL and batch cycles, and integrating with DB2/VSAM.

Qualifications

• 10+ years of hands-on mainframe application development experience.
• Strong proficiency in COBOL, JCL, DB2, and VSAM.
• Experience with CICS and IMS.
• Excellent communication and problem-solving skills.

Responsibilities

• Design, develop, enhance, and maintain mainframe applications using COBOL.
• Develop and support batch and online programs (CICS).
• Write and maintain JCL, manage job scheduling, and support batch cycles.
• Develop and maintain integrations with DB2, VSAM, and other mainframe data sources.
• Perform unit testing, system testing, and UAT support.
• Troubleshoot production issues and provide production support.
• Participate in requirements analysis and translate business needs into technical solutions.
• Collaborate with cross-functional teams including analysts, testers, and infrastructure teams.
• Follow established SDLC, change management, and release processes.
• Support documentation, knowledge transfer, system modernization initiatives, and continuous improvement as applicable.

Skills

COBOL

JCL

DB2

VSAM

CICS/IMS

Batch & Online

Expeditor/Intertest/Endeavor/Changeman

Tools

Expeditor

Intertest

Endeavor

Changeman

Job description

Infinite is a global leader in digital engineering and IT services, with over 20 years of experience driving digital transformation. We partner with leading Fortune 1000 companies to deliver innovative, scalable technology solutions that accelerate business outcomes.

With deep expertise in telecommunications, healthcare, banking, and finance, Infinite helps organizations optimize and modernize their technology landscapes to achieve long-term growth and efficiency.

JOB SUMMARY

As Senior Mainframe Application Developer, you will bring IBM z/OS expertise to design, develop, and maintain enterprise-grade mainframe applications for mission-critical programs. You will collaborate with cross-functional teams and contribute to modernization efforts. Applying AI-enabled tools where applicable to accelerate delivery and documentation.

Key Responsibilities

• Design, develop, enhance, and maintain mainframe applications using COBOL.
• Develop and support batch and online programs (CICS).
• Write and maintain JCL, manage job scheduling, and support batch cycles.
• Develop and maintain integrations with DB2, VSAM, and other mainframe data sources.
• Perform unit testing, system testing, and UAT support.
• Troubleshoot production issues and provide production support.
• Participate in requirements analysis and translate business needs into technical solutions.
• Collaborate with cross-functional teams including analysts, testers, and infrastructure teams.
• Follow established SDLC, change management, and release processes.
• Support documentation, knowledge transfer, system modernization initiatives, and continuous improvement as applicable.

Required Qualifications

• 10+ years of hands-on mainframe application development experience (flexible for strong candidates).
• Strong proficiency in COBOL, JCL, DB2, and VSAM.
• Experience with CICS and/or IMS.
• Experience developing and supporting both batch and online applications.
• Familiarity with mainframe development and debugging tools, such as Expeditor, Intertest, Endeavor, or Changeman.
• Experience working in production support environments.
• Strong problem-solving, troubleshooting, and communication skills.
• Ability to work independently with minimal ramp up.
• Excellent communication skills (written and verbal).

Preferred Qualifications

• Financial services or other regulated industry experience.
• Strong testing background (functional, system, and UAT).
• Experience in Agile and/or Waterfall delivery environments.
• Exposure to modernization efforts or integration with web / distributed technologies.
• Experience using AI tools to support code generation, documentation, test case creation, testing acceleration, and developer productivity.
• Familiarity with AI-enabled and modernization tools such as Zowe, GitHub Copilot, and IBM Watsonx.
• Ability to obtain and maintain a U.S. citizen security clearance, if required for client or federal program support.