Mainframe Developer

Job Title: Mainframe DeveloperLocation: RemoteDuration: 6 Months (Possible Extension)Not able to work with C2CExperience with:ACI Postilion is mustRole OverviewThe 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 experienceEEO: “Mindlance is an Equal Opportunity Employer and does not discriminate in employment on the basis of – Minority/Gender/Disability/Religion/LGBTQI/Age/Veterans.”