MAINFRAME DEVELOPER

ROLE

MAINFRAME DEVELOPER

TORONTO - HYBRID - FULLTIME

Role Summary

We are looking for a Mainframe Developer with strong Credit Cards domain experience to design, develop, and support mission‐critical credit card processing applications . The role involves working on high‐volume batch and online mainframe systems supporting the end‐to‐end credit card lifecycle , ensuring stability, performance, and regulatory compliance.

Key Responsibilities

Mainframe Development – Credit Card Systems

• Design, develop, and maintain mainframe applications supporting credit card issuing platforms .
• Work across card lifecycle modules , including:
• Account setup & card origination
• Authorization & transaction processing
• Billing, statements, interest & fees
• Payments, collections, disputes & chargebacks
• Develop and enhance batch and online (CICS) programs for large‐scale transaction processing.

Technical Responsibilities

• Hands‐on development using:
• COBOL / COBOL II
• JCL
• CICS
• DB2
• VSAM (KSDS / ESDS)
• Handle job scheduling, restarts, abend resolution, and performance tuning .
• Perform root cause analysis (RCA) for production incidents and implement permanent fixes.

Integration & Platform Support

• Support integrations with:
• Card networks (Visa / Client)
• Fraud & risk systems
• Core banking and downstream systems
• Implement scheme‐mandated and regulatory changes impacting card processing flows.
• Participate in platform upgrades, enhancements, and modernization initiatives .

Testing & Production Support

• Support unit testing, system testing, UAT, and production releases .
• Provide L2 / L3 production support for card applications.
• Prepare and maintain technical documentation and runbooks .

Required Skills & Experience

Must Have

• 6–10+ years of hands‐on Mainframe development experience
• Strong experience in Credit Cards domain (issuer side preferred)
• Expertise in:
• COBOL, JCL, CICS, DB2, VSAM
• Batch & online transaction processing
• Experience working in high‐volume, mission‐critical banking systems
• Strong analytical, debugging, and problem‐solving skills

Domain Knowledge (Mandatory)

• Credit card transaction lifecycle
• Authorization, clearing & settlement
• Billing cycles, interest, fees, payments
• Disputes & chargebacks
• Regulatory and card‐scheme driven changes

Good to Have

• Experience with card processing platforms (issuer or processor‐hosted)
• Exposure to mainframe coexistence / modernization programs
• Knowledge of Agile delivery models
• Experience working with global banking clients

Tools & Environment

• z/OS Mainframe
• Scheduling tools (e.g., CA‐7 / Control‐M)
• Change & release management tools

Incident management tools