Mainframe Developer

Job Title: Mainframe Developer

Location: Remote

Duration: 6 Months (Possible Extension)

Not able to work with C2C

Experience with:

ACI Postilion is must

Role Overview

The engineer will work on critical payment-processing applications supporting debit card, ATM, and POS transactions, with a strong focus on transaction messaging, production support, troubleshooting, and system integration.

Key Responsibilities

• Support and troubleshoot debit, ATM, and POS transaction-processing systems.

• Work with ACI Worldwide Postilion for transaction processing and switching.

• Analyze and troubleshoot ISO 8583 transaction messages.

• Support integration between payment-processing platforms and mainframe systems.

• Provide production support and incident management, including root-cause analysis and issue resolution.

• Work with SQL Server and SSIS for data analysis and integration.

• Support TLS/SSL certificate management and secure system connectivity.

• Work with HSM infrastructure for payment security and cryptographic operations.

• Participate in data center/CoLo migrations, testing, cutover, and post-migration support as needed.

Required / Key Experience

• Hands-on experience with ACI Postilion or similar payment transaction-switching platforms.

• Strong understanding of ISO 8583 messaging.

• Experience with debit/ATM/POS transaction processing.

• Experience with mainframe/payment-system integration.

• Strong production support and troubleshooting experience.

Preferred Experience

• ACI Trans24

• SQL Server / SSIS

• TLS certificate management

• HSM experience, preferably Utimaco

• Data center / CoLo migration experience

• Banking, payments, debit-card, ATM, or card-processing experience

EEO: “Mindlance is an Equal Opportunity Employer and does not discriminate in employment on the basis of – Minority/Gender/Disability/Religion/LGBTQI/Age/Veterans.”