Job DescriptionJob Description 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 & Setting

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

Incident management tools

📌 MAINFRAME DEVELOPER (Toronto)
🏢 Epsilon Solutions
📍 Toronto