Twilio Software Engineer interview questions

Recruiter reached out to me. After a typical phone screen they invited me onsite. They gave me the list of interviewers I'm going to meet but they refused to reveal any other information about the interview rounds.

Received a call from a recruiter. Scheduled the first round phone interview with the hiring manager. The interview went well and received call for the second round of phone interview. But the recruiter scheduled the second round with the same hiring manager again. On the day of the interview, the manager called 15 min late to tell that he is busy with an meeting and scheduled the interview next day. He called on time the next day and quickly identified that the recruiter has made a mistake in scheduling the interview. He told me that he will ask her to schedule the interview with one of his team members. Did not hear from the recruiter for 3 days and then had to mail her to get the interview scheduled. The second interview went well as well and I heard from them the same day for scheduling the onsite interview. I asked her to schedule it in January. But she insisted on December and stopped responding to me properly. Everytime I had to send a mail to get response for my previous mail. I did worked around my entire schedule and gave them dates for december but she could not schedule it on those dates. She then directed me to another recruiter regarding my onsite scheduling and I did not heard from her for a week. Had to mail her to ask about onsite scheduling. She tole me that she will respond in a week, But I did not hear from her again. I had to mail her to get an update when she told me that they have identified an intern to fill the position. Overall, very bad experience with the recruiters who are very unresponsive. They do not care about the time and effort candidates put in the interview. Would not suggest applying here.