Mainframe Developer

Job Summary

Location:

4910 Tiedeman Road, Brooklyn, Ohio

We are seeking an experienced Mainframe Application Developer with strong expertise in IBM z/OS environments. The ideal candidate will be responsible for designing, developing, maintaining, and supporting mainframe applications, ensuring reliability, performance, and scalability of business‑critical systems.

• Design, develop, test, and maintain applications on IBM Mainframe (z/OS platform).
• Develop and maintain programs using COBOL, JCL, and DB2 (including Stored Procedures).
• Work with VSAM datasets, file handling, and performance optimization.
• Manage and support batch processing schedules using Tivoli Workload Scheduler (TWS).
• Perform code management and version control using LCM (or similar tools).
• Utilize SORT utilities for data manipulation and processing.
• Develop and support online and batch applications using CICS.
• Integrate systems using MQ (IBM Web Sphere MQ) for messaging solutions.
• Participate in incident management, problem resolution, and production support.
• Collaborate with cross‑functional teams to deliver high‑quality solutions.
• Ensure adherence to coding standards, security practices, and compliance guidelines.

Bachelor's Degree or equivalent experience (preferred).

5+ years of relevant experience (required).

• IBM Mainframe z/OS COBOL programming
• DB2 and Stored Procedures
• JCL (Job Control Language)
• VSAM
• CICS
• MQ (Messaging)
• SORT utilities
• Tivoli Workload Scheduler (TWS)
• Code management tools (LCM or equivalent)
• Knowledge or exposure to ZWDYL

Strong debugging, problem‑solving, and analytical skills.

General Office – prolonged sitting, ability to communicate face‑to‑face or on the phone with teammates and clients, frequent use of PC/laptop, occasional lifting/pushing/pulling of backpacks, computer bags up to 10lb.

Hybrid (2+ days).

Base salary range: $80,000.00–$ annually. Placement within the pay range may differ based on various factors, including but not limited to skills, experience, and geographic location. Compensation also includes eligibility for incentive compensation, which may include production, commission, and/or discretionary incentives. Please  for a list of benefits for which this position is eligible.

Key has implemented an approach to employee work spaces which prioritizes in‑office presence, while providing flexible options in circumstances where roles can be performed effectively in a mobile environment.

Key Corp is an Equal Opportunity Employer committed to sustaining an inclusive culture. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, genetic information, pregnancy, disability, veteran status or any other characteristic protected by law. Qualified individuals with disabilities or disabled veterans who are unable or limited in their ability to apply on this site may request reasonable accommodations by emailing

Job Posting Expiration Date: 08/10/2026