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Job Title Debit Card Processing Specialist (Mainframe / Assembler)

Job Details

Job #: 3029243

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

Location: Hybrid – 2+ days a week, Downtown Toronto

Line of Business: Personal & Business Banking

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 solid 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.

Work 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 organizational 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

[email protected]

or 844‑463‑6178.

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Apply on Kit Job: kitjob.ca/job/2g8vu9

📌 Debit Card Processing Specialist (Mainframe) (Toronto)
🏢 Apex Systems
📍 Toronto