1. Technical
2. Managerial (most probably RM)
3. Project fitment
The job title and what they exactly looking for are quite misaligned. They seem to have committed to a certain timeline for a project that involves Mainframe migration.
They need a mainframes engineer... instead of hiring one who can actually help them with code reviews and COBOL reverse engineering as they call it, they are hiring business analysts and trying to get this done under pressure. HR is inefficient and doesn't have a voice, just does what the hiring manager says.