This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior Systems Analyst Programmer (IDMS / COBOL / Mainframe) based in United States. The Senior Systems Analyst Programmer will support mission-critical legacy applications within a large-scale IBM z/OS mainframe environment. This role combines systems analysis, application development, database expertise, and production support to ensure reliable enterprise operations. The successful candidate will work extensively with IDMS, COBOL, JCL, and mainframe utilities across batch and online processing environments. You will analyze business requirements, design technical solutions, develop enhancements, and troubleshoot complex production issues. The position offers the opportunity to contribute to systems that are essential to day-to-day organizational operations while collaborating with technical teams and business stakeholders. This is a remote U.S.-based opportunity with occasional onsite work required in the Miami, Florida area. The ideal candidate is a highly experienced mainframe professional who combines deep technical knowledge with strong analytical and communication skills.