I'm curious, did someone teach you this or did you hear about it somewhere? I did volunteer college recruiting for my first employer and after looking at tons of job reqs I realized, why wouldn't you reverse engineer a job req if that's the job you wanted!
That's exactly how I learned it for myself as well: it was only after I started interviewing people that I realized you could use the job req to figure out exactly what you should be doing to work towards that job. Funny how you only realize stuff after you need it :)
Hundreds of job reqs and resumes later you have an "ah ha!" moment you never forget!
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