Haydon interview questions

What a Joke. I had an initial job interview with the their HR rep Austin, and it went very well. The interviewer asked to verify my phone number so he could setup the second interview with the hiring manager and then never heard back from him. I reached out via Linkedin messenger where he reached out to me first, and then he ghosted me. This is so unprofessional! Why do companies do this to people. Such a shame!