IT & Software

Mainframe Application Support Engineer

Epsilon Solutions Ltd.

Toronto · Ontario · Canada

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We are seeking an experienced Mainframe Application Support Engineer to provide production support, incident management, and application maintenance for critical mainframe-based business applications. The ideal candidate will have strong expertise in IBM Mainframe technologies involving IBM z/OS, COBOL, JCL, DB2, VSAM and CICS, troubleshooting production issues, ensuring application stability, and driving continuous service improvements.

The role requires close collaboration with development, infrastructure, business, and operations teams to support mission-critical applications while maintaining agreed service levels.

Key Responsibilities

  • Provide L2/L3 support for mainframe applications in production environments.
  • Investigate, analyze, and resolve production incidents within SLA timelines.
  • Perform root cause analysis (RCA) and implement preventive measures.
  • Support critical business events, release deployments, and production changes.

Application Maintenance

  • Analyze application failures and identify corrective actions.
  • Coordinate with development teams for defect fixes and enhancements.
  • Validate fixes and support deployment activities.
  • Ensure application availability, reliability, and performance.
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Reference: WJ-4483_1511031 · Posted 08 Nov 2026, 02:57 AM

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