Mainframe Networking Jobs in Toronto, ON (NOW HIRING)

Debit Card Processing Specialist (Mainframe / Assembler)

Apex Systems is a global IT services provider and our staffing practice has an opening for a Debit Card Processing Specialist to place at our client, a top Canadian Bank under the Personal & Business Banking portfolio.

Client: A Top Canadian Bank 

LOB: Personal & Business Banking

Terms: 6-month Contract-to-Hire (strong preference to convert the right candidate).

Location: Hybrid 2+ days a week Downtown Toronto

Overview

We’re hiring a Debit Card Processing Specialist to support and enhance a complex debit card processing ecosystem. This role is ideal for an intermediate-level engineer/analyst with strong payments/network knowledge and hands-on mainframe (Assembler) development experience. The focus is on understanding and supporting end-to-end debit transaction flows and contributing to technical analysis and development work in a production-minded environment.

Key Responsibilities

• Provide technical analysis and support for the debit card processing ecosystem, including end-to-end transaction flows.
• Working with Interac and Mastercard/VISA network processing
• Trace, troubleshoot, and explain debit transaction and network flows across systems and rails.
• Perform hands-on mainframe development (Assembler) and related system analysis activities.
• Support production-oriented investigation and problem-solving efforts (triage/root cause focus).
• Work independently on priority assignments while collaborating with cross-functional teams.

Required Qualifications

• 7+ years of relevant experience in technology roles supporting payments or debit systems.
• Strong, practical knowledge of debit card processing and how transactions flow through networks/rails.

·        Experience with Interac and Mastercard/VISA network processing

• Experience with network flows and familiarity with ISO messaging/metrics.
• Hands-on mainframe experience, including Assembler development.
• Proven ability to work in/around production environments with strong troubleshooting skills.
• Strong analytical thinking, attention to detail, and organization skills.
• Ability to ramp quickly, be proactive, and take ownership of problems end-to-end.

Preferred / Nice-to-Haves

• Experience with Connex (highly valued).
• Exposure to TSYS (especially if able to discuss end-to-end transaction processing, not only account-level views).
• Broader payments ecosystem knowledge (e.g., familiarity with major debit/credit network concepts).

Engagement Type

• Contract-to-hire (strong preference to convert the right candidate).

Must-Haves (Non-Negotiables)

• Debit card processing domain expertise
• • Strong understanding of how debit card processing works, including transaction flows and network/payment rails.
• Network experience specific to debit processing
• • Understanding of network flows and how transactions move across the ecosystem.
  • Familiarity with ISO messaging/metrics (as referenced in notes).
• Hands-on mainframe development experience
• • Assembler coding experience (hands-on).
• Development background is required
• • Not looking for a pure QA or pure BA profile.
• Production experience/exposure
• • Has supported or worked in/around production environments and understands operational realities.
• Experience level
• • Targeting ~7+ years overall (intermediate “high L6 / L7” type profile).

EEO Employer

Apex is an Equal Employment Opportunity/Affirmative Action Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, age, sexual orientation, gender identity, national origin, disability, protected veteran status, or any other characteristic protected by law. Apex will consider qualified applicants with criminal histories in a manner consistent with the requirements of applicable law. If you have visited our website in search of information on employment opportunities or to apply for a position, and you require an accommodation in using our website for a search or application, please contact our Employee Services Department at employeeservices@apexsystemsinc.com or 844-463-6178.