ATM Engineer

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.

• Lead and support end-to-end implementation of Postilion switch (ATM/POS acquiring & issuing)
• Gather and document business requirements (BRD, SRS) for payment systems
• Transaction routing
• Device handlers (ATM/POS)
• Integrate Postilion with Core Banking Systems, Card Management Systems (CMS), External networks like Visa Inc. and Mastercard
• Key exchange & encryption (DUKPT, PIN translation)
• 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

• Hands-on experience with
• Message formats (ISO 8583 fields & DE)
• APIs / host integrations

• Encryption & security (HSM, PIN blocks, keys)

• Reconciliation (GL vs Switch vs Network)
• Scheme rules (Visa / Mastercard)

• Core Payments Knowledge
• Strong understanding of ATM & POS transaction flows
• ISO 8583 message structure

• Interchange, MDR, and fee calculations
• Cross-border transactions & currency handling

• Experience with Fraud systems integration

• Strong stakeholder communication (Bank, Vendor, Scheme)
• Problem-solving in high-volume transaction environments
• Ability to handle production issues under SLA pressure