The Jane Street phone interview typically begins with a recruiter scheduling a 30–45 minute session focused on mental math, probability, and logic puzzles to assess quick thinking, mathematical intuition, and communication skills. Candidates are expected to solve problems mentally, often involving expected value, conditional probability, or strategic reasoning, and to clearly explain their thought processes. The tone is usually collaborative, with interviewers guiding the candidate through problem-solving rather than strictly evaluating correct answers. Follow-up rounds may delve deeper into multi-step or game-theoretic scenarios, depending on the role and initial performance.