Interstellar Lab interview questions

I was invited to an interview after submitting my cover letter and CV. First technical interview followed by an interview with CEO and an email stating why I wanted to work there. After that, they ghosted me, never an answer despite following up several times...

I applied online and I interviewed for the position of Junior embedded engineer. First interview was a short video interview with their software Team lead Jeremy to discuss the job requirements and ask questions about background, After one week I had a technical interview with the software team lead, he just asked basic questions in electronics, embedded system, c, python. After three week from the last interview they told that they need to stop the process until they can hire a senior embedded engineer first. And then after two weeks they told me that they were able to open again the position of junior embedded engineer , So I got an interview with the CEO of the company Barbara, She asked me few questions like "what is your big achievement" and at the end of the interview she told that the team will contact me to complete the procedure in the same week. But I didn't get any response from them. I sent to the CEO and the team lead a message to remind them and to ask about the status of my application but they ignore me. I also sent other message after two weeks, and they still don't want to answer.