Klaviyo·Full Stack Engineer

Klaviyo Full Stack Engineer interview experience

No offer

Hard

Positive

Boston, MAPosted Apr 2026 · Candidate report, summarized by Dataford

My first contact was a quick recruiter screen, and then I received the CodeSignal link for the online assessment.

After I completed that, the process moved into a longer onsite structure built around multiple rounds that covered work you’d done, how you think, and how you collaborate.

The onsite portion was split into deep technical and behavioral pieces, and it wasn’t just generic theory. One round was a deep dive into past work and systems design decisions, where I had to explain not only the architecture but also the reasoning behind trade-offs. Another round focused on leadership and behavioral themes, digging into conflict resolution and decision-making in complex situations. There was also an

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