Mainframe Application Support Engineer

Epsilon Solutions Ltd.; Toronto; On-site; CAD 90,000 - 120,000; Full time

Job summary

Epsilon Solutions Ltd. seeks an experienced Mainframe Application Support Engineer to provide production support, incident management, and maintenance for critical mainframe applications. The candidate will work with z/OS, COBOL, JCL, DB2, VSAM and CICS to troubleshoot issues and improve service stability.

Collaborating with development, infrastructure, and operations teams, you will ensure adherence to SLAs and drive continuous service improvements in a mission-critical environment.

Qualifications

• Experience with IBM Mainframe ecosystems including z/OS, COBOL, JCL, DB2, VSAM, and CICS.
• Strong debugging and problem-solving skills for production incidents.
• Ability to collaborate with cross-functional teams and manage incidents to SLA.

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.
• Analyze application failures and coordinate with development teams for fixes and enhancements.

Skills

Mainframe

z/OS

COBOL

JCL

DB2

VSAM

CICS

Incident management

Job description

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.