Senior Developer Mainframe / Assembler (z/OS, TPF) Location: Remote or NEC Region Position Overview Amtrak is seeking a Senior Developer with deep experience in IBM z/OS mainframe environments, specifically working with Assembly language and C/C++. The developer will support and enhance a critical legacy application primarily written in Assembler, while also contributing to system integrations and new service development. This role requires strong experience working with mainframe-based trans