HubSpot·Software Engineer

HubSpot Software Engineer interview experience

Medium

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IrelandCandidate report, summarized by Dataford

After a recruiter conversation, I was sent a CodeSignal assessment and completed it before moving straight into the onsite.

The onsite itself was three rounds: two system design interviews and one coding round, and the coding part required me to use my own IDE and share my screen while building from input provided via a JSON file.

For the coding task, I had to implement a simple calculator represented as a tree structure. The problem wasn’t “hard” in the algorithmic sense, but I struggled with the JSON handling and couldn’t finish the final piece. That was a frustrating gap, because the rest of the task had felt within reach until the input/output plumbing ate up time.

The first system design round asked for a

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