IsManagementjob field value depends on the job profile.
If the Job profile for the top management like Director, CEO, President, Manager, Lead, etc., are mentioned in the JD, then the value of ManagementJob will be "true."
If not mentioned anything and the job profile is Architect or sales, it will be "False."
If you have any questions, here is our Jd's sample; you can parse some JDs and test it at your end.
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