{"schemaVersion":"jobsearcher.job.v1","id":"dc0338835537d0e5e11995be","url":"https://jobsearcher.com/jobs/dc0338835537d0e5e11995be","canonicalUrl":"https://jobsearcher.com/jobs/dc0338835537d0e5e11995be","title":"Mainframe Developer","description":"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.”","company":"Mindlance","rawCompany":"mindlance","city":"Buffalo","state":"NY","isRemote":false,"isActive":false,"createdAt":"2026-09-02T08:40:09.938Z","occupations":[{"code":"15-1252.00","title":"Software Developers","slug":"software-developers"},{"code":"15-1299.08","title":"Computer Systems Engineers/Architects","slug":"computer-systems-engineers-architects"},{"code":"15-1251.00","title":"Computer Programmers","slug":"computer-programmers"}],"industries":[{"code":"541512","title":"Computer Systems Design Services","slug":"computer-systems-design-services"},{"code":"522320","title":"Financial Transactions Processing, Reserve, and Clearinghouse Activities","slug":"financial-transactions-processing-reserve-and-clearinghouse-activities"},{"code":"541511","title":"Custom Computer Programming Services","slug":"custom-computer-programming-services"}],"jobPosting":{"@context":"https://schema.org","@type":"JobPosting","title":"Mainframe Developer","description":"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.”","datePosted":"2026-09-02T08:40:09.938Z","dateModified":"2026-09-02T08:40:09.938Z","hiringOrganization":{"@type":"Organization","name":"Mindlance","sameAs":"https://jobsearcher.com"},"jobLocation":{"@type":"Place","address":{"@type":"PostalAddress","addressLocality":"Buffalo","addressRegion":"NY","addressCountry":"US"}},"identifier":{"@type":"PropertyValue","name":"JobSearcher","value":"dc0338835537d0e5e11995be"},"url":"https://jobsearcher.com/jobs/dc0338835537d0e5e11995be"}}