Umbra Space interview questions

Was reached out by a recruiter about two weeks after applying. Had an interview with hiring manager, then completed a technical assessment. After technical assessment, had a follow up technical interview that consisted of going through my solution to the technical assessment and implementing two new features on top of my existing solution. The company then completely ghosted me for 3 weeks after the interview and I have yet to receive any feedback, follow up interviews, or a hiring/rejection decision. Completely unprofessional and informal hiring process.