I interviewed with LoadUp recently. The initial call is ~30 minutes with their HR/recruiter where you discuss the company and position in more detail. The second interview is a short conversation with the Head of Engineering, they ask a few behavioral questions and give you a code challenge. I was told to spend no more than 1-2 days on the code challenge, and that LoadUp respects your time. Communication up until this point was very quick, however it took two weeks for me to hear back about the cc, and I never received any feedback.