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Epsilon Solutions Ltd.

Mainframe Application Support Engineer

Toronto, ON, Canada

Contract

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Job details

Job type: Contract
Apply by: Dec 3, 2026
Posting language: English
Posted: Nov 3, 2026

Original job description

Mainframe Application Support Engineer

Toronto Hybrid 4 days a week on site

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

Production Support & Incident Management

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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More about this job

Responsibilities

Provide L2/L3 production support for critical mainframe applications, investigate and resolve incidents within SLA timelines, and perform root cause analysis with preventive measures. Maintain application availability, reliability, and performance while coordinating defect fixes, enhancements, releases, and production changes with development and other teams.

Requirements

The role calls for an experienced mainframe application support engineer with strong expertise in IBM z/OS, COBOL, JCL, DB2, VSAM, and CICS. Candidates should be able to troubleshoot production issues, manage incidents, and collaborate with development, infrastructure, business, and operations teams.

Skills

IBM z/OS
COBOL
JCL
DB2
VSAM
CICS
Mainframe Application Support
Production Support
Incident Management
Troubleshooting
Root Cause Analysis
Application Maintenance
Release Deployments
Production Changes
Performance Monitoring

Visa sponsorship

Not detected in the job text

Keywords

Mainframe
IBM z/OS
COBOL
JCL
DB2
VSAM
CICS
Production Support
L2 Support
L3 Support
Incident Management
Production Incidents
SLA
Root Cause Analysis
Preventive Measures
Application Maintenance
Application Stability
Application Availability
Application Reliability
Application Performance
Defect Fixes
Enhancements
Release Deployments
Production Changes
Mission-Critical Applications
IT Services
IT Consulting

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