Teamwork Senior Software Developer interview questions

The worst interview I've ever experienced. The whole process took about 2 months from start to finish. It took nearly 2 weeks of waiting before I was able to find out if I got to the next stage with no updates in between. Anytime I asked for one, I was told ridiculous excuses and brushed off. After passing the phone and coding tests, I was called in for a face-to-face interview. I was impressed by the office space but as others say, that's where the positives end. I was interviewed by a developer and some 'other' person, which they didn't tell me who it was at first, but judging by their age, seemed to be a fresh college graduate. When I was answering the questions, the developer often laughed at my answers in a sarcastic, put-down way which I thought was unprofessional for an interview setting. Ironically, I was told of a few firings of people due to bullying. I was frequently interrupted by various notifications coming from the developer's laptop and phone, which they didn't bother to silence. At the end of the interview when it was my turn to ask questions, I found that that the 'other' person that was interviewing me was in-fact an intern. I have never encountered in my whole career to be interviewed for a senior role by an intern. This is absolute shambles. This company is full of red flags. AVOID.

Technical challenge to be completed in Go at home with a week to complete with tests. Relatively simple scenario. Upon completion very minimal feedback given and lack of any coherent follow up. Recruitment team indicated they'd reach out when hiring for the position I had applied for despite saying they were before commencing. Company continues to advertise for position with no follow up. Disappointing handling in general and mixed messages throughout