The entry-level software engineering interview consisted of 3 rounds. Codings assessment, Behavioral and Final round with engineers which is about 15 mins behavioral and 45 mins technical (easy to medium).
A lot of reviews have gone into details on each round so I highly recommend to research them before your interviews.
One thing I want to add is this will be one of the few best interviews you've taken. They give resources to prepare you for the rounds so make sure to ask about resources, you have resources on here as well so make sure to use them. The interviewers are probably the nicest I have seen so make sure to be nice and respectful to them as well. They want their candidates to be the best they can and as prepared as they can be so they do what they can to help.
The best part about this is that they give feedback "No wayy!!" Yes, I didn't get the offer but I was given the extremely rare opportunity to hear some feedback. Please don't be humble yourself and schedule a time with your recruiter to hear some feedback. This is something very very few companies do but HubSpot has set a time aside for this. Take advantage of it.
Overall wonderful interview experience.