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Mainframe Developer

Apolis

St. Louis, Missouri, United States Full-time May 12, 2026
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Vacancy Description

Role: Mainframe Developer

Duration: 12+ Months

Location: Remote

 

Only W2

 

We are seeking a Mainframe Developer to develop, enhance, and support mission-critical applications on IBM z/OS. This role includes batch and/or online transaction processing, database work (DB2/IMS), testing, and production support.

 

Roles & Responsibilites

  • Design, develop, and maintain mainframe applications using COBOL (and/or PL/I), JCL, and related technologies.

  • Develop and support batch processing jobs (job streams, scheduling coordination, restarts, abend handling).

  • Build and maintain online applications using CICS and/or IMS TM, including transaction and screen/program changes.

  • Develop and optimize data access using DB2 (SQL) and/or IMS DB; perform basic performance tuning as needed.

  • Conduct impact a...

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