Exa Ai

Interview Format and Outcome The session was a strict 15-minute rapid-fire verbal technical screen. The candidate did not move forward in the hiring process. Technical Questions 1. Unit Conversion: State the exact number of megabytes contained in one gigabyte. 2. Probability: Calculate the probability of missing a basket three times in a row, assuming an 80% success rate for making a single shot. * Solution Logic: Calculate the inverse probability (20% chance to miss) and raise it to the power of three ($0.2^3$). 3. System Design: Design a system to index one million documents, each containing a set of words. * Core Task: Create a mechanism that accepts a single-word query and returns all documents containing that word. * Scaling: Explain how the proposed design handles scaling. * Standard Approach: Implementation of an inverted index. Process Constraints and Environment * Time Pressure: The 15-minute limit forced a rushed pace, leaving only approximately five minutes to outline the system design and scaling architecture for the final question. * Interviewer Interaction: The interviewer maintained a low-energy demeanor and declined to answer clarifying questions. * Atmosphere: The session lacked conversational elements, functioning strictly as a unidirectional examination.