RenoRun Senior Software Developer interview questions

They've sent me a message in my Linkedin profile. 1 - Online RH interview of about 1 hour just to understand your experience and confirm the information in you resume. 2 - Online technical interview of about 1 hour. One simple question of Data Structure & Algorithms. One simple question about Design Patterns. Other 30 minutes talking about technologies, design patterns and architectures. 3 - Online technical interview of about 1 hour. Just talking about technologies, architectures and my activities in my current job. The second interview was with two developers. Both of them were junior with 2-3 years of experience and their only experience was in RenoRun. The third interview was with an Engineering Manager. All his experience of 4 years was working in RenoRun. It is really weird that juniors are interviewing developers for senior positions. It seems that they don't have many seniors over there. Even the Engineering Manager, that is supposed to be a technical leader, was at most an intermediate developer. After a couple of days they sent me an email saying that I didn't have the knowledge necessary for the role.