ATM Engineer
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Key skills for this role
About the Role
We are looking for a skilled Postilion Implementation Specialist with strong experience in electronic payments, card transaction processing, and switch systems. The candidate will be responsible for implementing, configuring, and supporting ACI Postilion solutions for ATM, POS, and online transactions.
Key Skills for This Role
Full Job Posting
Overview
We are looking for a skilled Postilion Implementation Specialist with strong experience in electronic payments, card transaction processing, and switch systems.
The candidate will be responsible for implementing, configuring, and supporting ACI Postilion solutions for ATM, POS, and online transactions.
Job Accountabilities/Essential Functions Responsibilities
Lead and support end-to-end implementation of Postilion switch (ATM/POS acquiring & issuing)
Gather and document business requirements (BRD, SRS) for payment systems
Configure Postilion components:
Transaction routing
Message parsing & formatting (ISO 8583)
Device handlers (ATM/POS)
Integrate Postilion with:
Card Management Systems (CMS)
External networks like Visa Inc. and Mastercard
Work on:
Key exchange & encryption (DUKPT, PIN translation)
Transaction life cycle (Authorization → Clearing → Settlement)
Handle scheme certifications (Visa/Mastercard testing & compliance)
Support chargeback, reconciliation, and dispute flows
Perform SIT/UAT testing and production deployment support
Troubleshoot transaction failures, reversals, and reconciliation breaks
Technical Skills
Hands-on experience with:
Experience in
Message formats (ISO 8583 fields & DE
SQL queries for reconciliation/debugging
APIs / host integrations
Basic understanding of:
Encryption & security (HSM, PIN blocks, keys)
Chargeback lifecycle (Pre-arb, Arbitration)
Reconciliation (GL vs Switch vs Network)
Core Payments Knowledge
Strong understanding of:
ATM & POS transaction flows
Acquiring vs Issuing
ISO 8583 message structure
EMV transactions & fallback scenarios
Knowledge of:
Interchange, MDR, and fee calculations
Cross-border transactions & currency handling
Good to Have:
Experience
with:
Fraud systems integration
Tokenization / digital payments
Soft Skills
Strong stakeholder communication (Bank, Vendor, Scheme)
Problem-solving in high-volume transaction environments
Ability to handle production issues under SLA pressure
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