Xai Interview Questions
Practice the exact questions companies are asking right now.
"10 years of experience but never worked at a top company. PracHub's senior-level questions helped me break into FAANG at 35. Age is just a number."
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Implement an in-memory database with TTL and backup
In-Memory Database (Levels 1–4: TTL and Backup/Restore) Implement an in-memory database that stores records identified by a string key. Each record co...
Compute dasher pay from order events
Dasher naive pay (active-time with overlapping orders) You are given a list of events describing when a delivery driver ("Dasher") accepts and fulfill...
Flatten and unflatten nested Python structures
You are given nested Python data structures used to represent hierarchical data. Supported node types - Parent/container nodes can be: - list - tu...
Maximize distinct values after unique ± offsets
Problem You are given an integer array a of length n and a non-negative integer k. For each index i, you must choose: - an integer offset d_i such tha...
What are processes vs threads?
Question Explain the difference between multiprocessing and multithreading in the context of building concurrent applications. Cover the following: - ...
Compute total active time per Twitter Space
You are given an event log of user activity in Twitter Spaces. Each record has: - operation: one of create, join, leave - space_id: identifier of the ...
Design a multi-level API rate limiter
Scenario You are building a backend for an “insight platform”. The platform exposes HTTP APIs that are called by many tenants and many end-consumers. ...
Implement dynamic batching for token decoding
You are given a black-box “simulated language model” interface that can advance many sequences in a batch. Model interface - Tokens are integers. - mo...
Fix race condition in concurrent deposit
Concurrent bank account debugging (thread safety) You are given a simple BankAccount object that is used concurrently from multiple threads. Two depos...
Design a backend for an online checkers game
Design the backend system for an online, turn-based checkers game. Requirements Cover (at minimum): 1. Core gameplay - Create a new game and initia...
Identify all bad nodes with group tests
You have N nodes. Each node is either good or bad (unknown to you). You can call a function test(S) on a subset of nodes S: - test(S) = True iff all n...
Design agentic workflow to generate a 1-hour movie
Prompt You’re asked to design an agentic workflow (multiple LLM/tools acting as “agents” under an orchestrator) that can generate a ~60-minute movie f...
Find kth element and sliding-window kth in stream
You are given two related tasks. Task 1: Kth element in an array Given an integer array nums of length n and an integer k (1-indexed), return the k-th...
Implement a parallelized sort
Problem: Parallelized Sort (Shared-Memory) Implement a function that sorts an array using parallelism. Task Write a function (language of your choice)...
Design a follower push-notification system
Design a notification system for a social product: - When a user publishes a new post, the system should send push notifications to that user’s follow...
Design backend to score and classify tweets
You are asked to build a small backend application that processes Twitter data and uses an external LLM-style API to score and classify each tweet. Re...
Implement a trie-based tokenizer
Design and Implement a Trie-Based Subword Tokenizer for LLM Pretraining Context You are building a subword tokenizer for a large-scale LLM pretraining...
Explain process vs thread and memory-sharing risks
You are asked about OS concurrency fundamentals. Prompt 1. What is the difference between a process and a thread? 2. Do processes and threads share me...
Design O(1) random-sampling set
Design a data structure that supports insert(x), remove(x), and get_random() that returns a uniformly random element among the present items, all in e...
Answer technical-challenge and motivation questions
Answer the following behavioral interview questions: 1) Describe the most technically challenging problem you have solved. What made it hard, what did...