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Mainframe Application Engineer, Senior

Imagine One
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Indianapolis, IN, 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 Business Information System (BIS). The engineer formulates or updates BIS architectures and assists mainframe software sustainment teams with implementation and testing of system changes supporting Marine Corps enterprise pay and personnel systems.

Key Responsibilities:

  • Analyze, design, and document updates to COBOL-based mainframe applications.
  • Implement changes to batch and CICS-based applications within z/OS environments.
  • Formulate and update Business Information System architectures.
  • Support implementation, integration, and testing of application changes.
  • Engineer enterprise-scale pay and personnel business rule logic updates.
  • Support RMF/MCAAP-aligned engineering activities.
  • Develop operational and system-level architecture views.
  • Collaborate with sustainment and production control teams to support releases.

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.

Minimum Certifications: 

  • IAT Level II baseline certification required.

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

578980|loc2

Security Clearance

SECRET
About Imagine One
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