Hiring the right person is a hard task. Don’t make your life harder by not knowing who it is.
When I started hiring engineers for my startup, I thought it would be easy. I’d seen enough job postings in my life to know you just had to come up with some qualifications (‘BS or equivalent in Computer Science’, ‘5+ years experience with Python’, maybe even a cheeky ‘Ability to work both independently and as part of a team’), throw them into a bulleted list, and start picking the best candidates from the resumes that will surely flood in.