I was reached out to on LinkedIn to come to an information day on their local campus, then a week later was contacted about items on my resume that were relevant to a summer intern project they wanted completed. In our emails I was told about the problem and a general solution they envisioned (an IoT project), so in preparation I spent a day going through my past projects and drafting up my own detailed solution to their problem. Spent 5-10 minutes doing a few introduction and general behavioral questions, then most of the interview was centered around my solution and why I chose to do things the way I did. I was constantly bringing up relevant experiences in past projects to explain/defend my choices. Last 5-10 minutes of the hour were spent on questions I had, then I received a verbal offer at the end (Yes, the interview process was only one hour long). Got the official written offer probably about 1-2 months later (common experience for other interns too).