For some reason developers seem to assume that the recruiting process is immune to the regular company dysfunctions. If they scheduled an interview without an

For some reason developers seem to assume that the recruiting process is immune to the regular company dysfunctions. If they scheduled an interview without an agenda is because it's the norm to do that within the company when talking with outsiders. If someone jumps in to a call, it's their practice to have surprise guests within meetings. If someone ask you subject matter expert questions, it's how the company sees developers, as subject matter experts. So, you were interviewing to a company which views, my guess, developers as subject matter experts, has people jump in into calls and doesn't prepare specific calls.