Constant Contact interview questions

I had a very disappointing experience with Constant Contact’s recruitment process. After applying for a Manager of software Engineering position, I was quickly contacted by a recruiter who assured me the process would be smooth. We had a great conversation, he said my profile aligns well with the role and I was moving to the next stage and he'll reach out in the coming days with the availability of hiring manager. But after that initial conversation, communication completely stopped. Nothing. Despite sending a follow-up email, I didn’t receive any acknowledgement. It reflects a surprising lack of professionalism and basic courtesy.