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Mainframe Application Engineer, Senior

Imagine One
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Kansas City, MO, USA
Sep 21, 2026

Imagine One Technology & Management, Ltd. is seeking a Senior Mainframe Application Engineer, contingent upon award of the associated work. This position will be based in Charleston, SC.

The Senior Mainframe Application Engineer is responsible for analyzing, planning, designing, and documenting changes to mainframe software applications written in COBOL that execute in batch or online CICS environments within a z/OS-based environment. The engineer formulates or updates Business Information System (BIS) architectures and assists mainframe software sustainers with implementation and testing activities supporting Marine Corps enterprise manpower systems.

Key Responsibilities:

  • Analyze, design, and document updates to COBOL-based mainframe applications.
  • Implement changes to batch and CICS applications within z/OS environments.
  • Architect solutions based on government-provided design requirements.
  • Perform unit testing and support peer reviews.
  • Support Production Trouble Reports (PTRs), SCRs, and FCRs.
  • Provide hour estimates for Software Releases and Standalone SCRs.
  • Analyze and translate DoD pay and personnel business rule logic into secure code.
  • Develop operational and system-level architecture views.
  • Support engineering efforts aligned with MCAAP or other RMF implementations.

Desired Experience: 

  • 6+ years engineering enterprise-scale mainframe software applications.
  • 6+ years implementing and updating DoD pay and personnel business rule logic.
  • 4+ years engineering systems within MCAAP or other Risk Management Framework implementations.
  • Experience developing operational and system-level architecture views.

Security Requirements:  

  • U.S. Citizen.
  • Active Secret clearance required.

Imagine One offers a full package of benefits and competitive salary, excellent group medical, vision, and dental programs. 401K savings plan; $4K annual tuition reimbursement ($5K if pursuing master’s degree); employee training, development, and education programs; profit sharing; advancement opportunities; and much more!

ISO 9001:2015, ISO 20000-1:2018, ISO 27001:2022
CMMI Development and Services - Maturity Level 3
CMMC Level 2 (C3PAO)
An Employee-Owned Business

EEO/Vets/Disabled

Job ID

578983|loc3

Security Clearance

SECRET
About Imagine One
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