Four interviews, a personality test, an assessment and a background check. The candidate completed all of it and then heard nothing for three weeks. The post's conclusion is less anger than arithmetic: at some point you start wondering whether they were ever hiring in the first place.
The sequence is the part worth weighing. A personality test and an assessment are usually requested before an employer has decided to extend an offer, which means the candidate supplied structured, personal data — how they reason, how they work, how they behave under pressure — to a company that had committed to nothing. The interviews were only the visible portion of the funnel.
Three weeks is long enough that the silence stops reading as a delay and starts reading as an answer. The role, as far as the candidate could tell, was not filled in public either.
The company is not named in the post.