My interview started with a 3hr long api test. Using any language/tech stack, hit their api, do a bunch of data-parsing/manipulation and send it back. One of my favorite coding challenges I've ever taken. Felt real & meaningful. 2nd part was a quick 15-20 minute HR interview. Asked a few behavioral questions, name a time when...kind of questions. HubSpot does all of their final round interviews during the end of October. Waited a few months and got an email that I had been invited onsite. Since I was interviewing for Front-End I had a 1 hr algorithm interview followed by a 1 hr JavaScript interview (make sure to brush up on vanilla js fundamentals!). Everyone was super nice and seemed to really enjoy their job. Both onsite interviews had a 10 minute behavioral portion as well. At the end of both interviews there were time for questions. Overall, my favorite intern interview process that I've been a part of.

The interview process was two hours long. One hour JavaScript technical and one hour coding technical. Overall, chill interviewers and the questions were fair game. I would go through other posts on glassdoor.