Jane Street Software Engineer interview experience

I remember feeling like I answered decently at first, but the complexity kept compounding and I ended up confusing myself as the discussion progressed. That combination of speed and growing difficulty made it hard to recover once my mental model slipped.

Later, the pattern repeated in how the tasks evolved. The problems often began simple and then built up with additional extensions, pushing for a solution that was both correct and efficient. One interview especially emphasized clean reasoning and optimizing, where it wasn’t enough to land an answer; I had to discuss improvements the