Jane Street·Software Engineer

Jane Street Software Engineer interview experience

No offer

Hard

Neutral

Hong KongPosted Feb 2026 · Candidate report, summarized by Dataford

My first round was an online class-design task that lasted about an hour.

I was given a class interface and had to implement it using another given interface. The underlying theme was tree-like, and to move forward I needed to get far enough into the problem quickly enough.

That mattered because the structure wasn’t forgiving: if I spent too long struggling with earlier pieces, I couldn’t reach the components that mattered for progressing. I ended up not moving on.

What made the experience memorable was the pacing constraint—passing wasn’t just about correctness, it was about keeping a steady tempo through the parts that were necessary to qualify for the next

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