Tiktok 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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"Discovered PracHub 10 days before my interview. By day 5, I stopped being nervous. By interview day, I was actually excited to show what I knew."
"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."
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Write self-attention and cross-entropy pseudocode
You are asked to explain core Transformer / deep learning components. Part A — Self-attention pseudocode Write clear pseudocode (not full code) for sc...
Design multimodal deployment under compute limits
You need to answer a set of questions related to multimodal model deployment and post-training optimization in an interview. Provide systematic explan...
Implement stacks, streaming median, and upward path sum
Complete the following coding problems. State the time/space complexity and key edge cases for each. 1) MinStack Design a stack that supports: - push(...
Parse a nested list from a string
Given a string that encodes a nested list (ArrayList-like notation), parse it into an in-memory nested list structure. Input format - The string conta...
Solve string grouping and tree right-view problems
Problem 1: Group words that are anagrams You are given an array of strings words. Two strings are anagrams if they contain the same characters with th...
Explain overfitting, dropout, normalization, RL post-training
Machine Learning fundamentals Answer the following: 1. What is overfitting? How can it be mitigated in machine learning? 2. Narrowing to deep learning...
Calculate transaction fees from CSV records
You are given a CSV-like multi-line string representing transactions with columns: id,reference,amount,currency,date,merchant_id,buyer_country,transac...
Solve common string/DP/stack problems
You are given four independent coding tasks. For each task, describe your approach and analyze time and space complexity. Task 1: Longest substring wi...
Solve common interview coding problems
You are given several independent coding tasks (typical of SWE/MLE interview rounds). For each task, design an algorithm and describe the time/space c...
Delete nodes in linked list and binary tree
You are asked to solve two short coding tasks. You may assume standard node definitions: - Singly linked list node: val, next - Binary tree node: val,...
Design video captioning under compute limits
Scenario You are deploying a multimodal large model that generates captions for videos. Part A — Deployment under compute / VRAM constraints - The mod...
Find high-value crypto users and top-CTR product
You are given three tables (timezone: UTC). Assume create_date, transaction_time, and event_time are timestamps. Tables users - user_id BIGINT PRIMARY...
Compare Random Forests and Boosted Trees: Bias, Variance, Speed
Scenario A product/data science team is deciding between Random Forests and Gradient-Boosted Decision Trees (e.g., XGBoost) for a new predictive task....
Solve two grid problems (islands + min-cost path)
You are given two separate coding questions. Problem A: Count distinct islands (translation-equivalent) Given an m x n binary grid grid (0 = water, 1 ...
Maximize sum with no adjacent elements
Given an array of non-negative integers nums, choose a subset of elements such that no two chosen elements are adjacent in the original array. Return ...
Answer ML fundamentals and diagnostics questions
You are taking a timed online assessment with multiple-select and numeric-response questions. 1) Confusion-matrix metrics (multiple select) A binary c...
What skills are needed for AI infra roles?
You interviewed for an AI infrastructure / LLM serving internship role and were told the rejection reason was insufficient familiarity with vLLM, incl...
Explain FlashAttention, KV cache, and RoPE
You are interviewing for an LLM-focused role. 1. FlashAttention - Explain what problem it solves in transformer attention. - Describe the high-l...
Explain project choices, metrics, and AI usage
Behavioral / Project deep-dive You’ll be asked to walk through a recent project you worked on (preferably one with meaningful technical and business i...
Plan QA testing for a new feature
Scenario You are the QA/Test Lead for a social app’s Friends page. A new feature is being added (e.g., new friend recommendation module, new friend re...