HubSpot Software Engineer interview experience

The coding portion centered on merging two sorted lists with a k parameter, and there was a follow-up that pushed the idea further: how to merge when the number of lists wasn’t known ahead of time. I remember feeling like the core logic was familiar, but the follow-up made it clear they cared about how I generalized the approach.

In the next round, the questions turned more JavaScript-specific. One prompt involved adding a comma-inserting method to a string prototype, which required comfort with prototypes. Another asked for a factory function to create a custom logger that prepends a prefix