10/13/2026
Job Description: We are seeking a highly skilled Software Engineer with extensive experience in ACI Postilion Realtime SDK, payment network integrations, and transaction switching. The ideal candidate will be responsible for designing, developing, and supporting high-volume payment processing solutions that integrate with card networks, EFT networks, core banking systems, and third-party payment services. This role requires strong expertise in electronic payments, ISO 8583 messaging, transaction routing, authorization processing, network connectivity, and end-to-end payment transaction lifecycle management. Key Responsibilities Postilion Development Design, develop, and maintain custom applications using Postilion Realtime SDK. Develop new nodes using Rest API, routing logic, and authorization modules within the Postilion platform. Customize and support Postilion transaction workflows to meet business and network requirements. Develop interfaces between Postilion and...
CSI
Valparaiso, IN
Full Time
