About the service
I write and maintain code in REXX for classic IBM environments and have been doing this long enough to know where the pitfalls are hidden. My primary platform is z/OS: TSO and ISPF editor macros that eliminate monotonous keystrokes, batch REXX under IRXJCL and IKJEFT01, and utilities that parse, reformat, and validate flat files with millions of records. If your department still relies on the green screen, I turn manual steps into repeatable and logged automation. A typical set of deliverables includes ISPF edit and dialog macros, panels tied to REXX logic, work with tabular stem variables, EXECIO procedures for reading and writing datasets, careful parsing through PARSE patterns instead of brittle substring arithmetic. I also stitch together legacy job streams: wrap old JCL steps, generate symbolic parameters, call DB2 through the command interface, and pull SDSF output back into REXX for further processing. I deliver each script with code comments, a brief run instruction, sensible return codes, and error handling through SIGNAL ON ERROR so operators are left with no guesswork. Maintainability matters to me as much as working today, because mainframe code often outlives its author. Send me your current EXECs, a sample dataset, or a description of your manual routine — and I'll honestly assess the scope. Whether a small macro or a full modernization: I keep behavior predictable and documentation readable.
