Firefly Aerospace Propulsion Engineer interview questions

The first interview was a recruiter screening with mostly behavioural questions. The second interview was an interview with an engineering manager, this time, a mixture of behavioural and technical questions. The manager was very nice and asked questions about my specific experiences. The third interview was a technical interview with a lead engineer. Questions were specific and relatively difficult, but the interviewer was helpful in leading me along. I was told there would be one more interview after the 3rd round, but I was ghosted.