Not the most organized from my experience, but the interviews themselves were pretty standard: phone chat/screen, technical interview, and an onsite. Phone screen was fine, basically just seeing if I was interested and if the logistics were a good fit (salary, location, role, etc). Technical interview was one of the more fun ones, I appreciated that it was basically something to have fun with so you can show how you think and write code (more on that below). Onsite was less stressful than most, as it was less a gauntlet of technical interviews and more of a wholistic approach where I met most of the team and the questions were focused on my prior work and what I liked. Still with some technical questions, of course, but about my own past projects, which I felt gave me a better opportunity to show what my skillset was. After that, there were still some communication confusions, but it's a startup so that wasn't new to me.
Word of advice though, if you are interested in working here, be vocal about questions and check in when you're unsure or need clarification. It's not an excuse, but they typically have a lot going on and things fall through the cracks. Hopefully as they grow, this will be resolved and those after me will have a 100% pleasant experience!