Speechify Senior Frontend Developer interview questions

I was contacted by the interviewer over the email. A behavioral call was scheduled but no one joined the call from other end. I left after waiting for 15 min and dropping the email. Another call was scheduled for next day. It was normal behavioral questions you find everywhere. Post that, next round was scheduled as coding round and it was 2 hours of round. Was given a github repo which contained a video explaining coding problem and expectations. I had to extend it to create a text to speech application using provided Speech parser built on top of DOM API. Even after follow-ups, I am still waiting for a reply till now. After taking 3-4 hours from candidates, they just ghost them.