TikTok Coding & Algorithms Interview Questions
Practice 291 real TikTok interview questions for 2026 — TikTok interview questions drawn from actual interviews with detailed solutions to support focused interview preparation. This collection emphasizes coding and system-design skills first (Coding & Algorithms, System Design), then moves to analytics, experimentation, SQL/Python, machine learning, and behavioral topics. Expect live coding (arrays, strings, trees, DP), mid-level system-design rounds that probe scale and video-recommendation tradeoffs, product-analytics and A/B discussion, and role-specific takeaways for data and ML roles. Prep by practicing medium-to-hard coding problems, sketching scalable architectures, rehearsing STAR stories tied to impact, and building short SQL/Python notebooks that reproduce common TikTok metrics. For role-specific patterns: Software Engineer rounds repeatedly test string/DP/stack problems, nested-list parsing, tree and linked-list manipulations, and designing scalable testable APIs. Data Scientists focus on metric definition and decomposition, fraud and precision/recall tradeoffs, live-creator and Watch-Time SQL, recommendation-bias and misinformation analysis, streaming-median and path-sum style algorithmic tasks, and multimodal deployment constraints. Machine Learning Engineers see dynamic-K models, video-captioning and multimodal embedding design under compute limits, attention/KV-cache topics, and ML diagnostics. Product Managers get flow critiques, A/B test design, monetization and anti-cheat product cases.
"I got asked a hardcore MCM DP question and I saw it on PracHub as well. Solved that question in 5 minutes. Without PracHub I doubt I could solve it in 5 hours. Though somehow didn't get hired, perhaps I guess I solved it too fast? /s"
"Believe me i'm a student here jn US. Recently interviewed for MSFT. They asked me exact question from PracHub. I saw it the night before and ignored it cause why waste time on random sites. I legit wanna go back and redo this whole thing if I had chance. Not saying will work for everyone but there is certainly some merit to that website. And i'm gonna use it in future prep from now on like lc tagged"
"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."
"I was skeptical about the 'real questions' claim, so I put it to the test. I searched for the exact question I got grilled on at my last Meta onsite... and it was right there. Word for word."
"Got a Google recruiter call on Monday, interview on Friday. Crammed PracHub for 4 days. Passed every round. This platform is a miracle worker."
"I've used LC, Glassdoor, and random Discords. Nothing comes close to the accuracy here. The questions are actually current — that's what got me. Felt like I had a cheat sheet during the interview."
"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."
"Legit the only resource you need. TC went from 180k -> 350k. Just memorize the top 50 for your target company and you're golden."
"PracHub Premium for one month cost me the price of two coffees a week. It landed me a $280K+ starting offer."
"Literally just signed a $600k offer. I only had 2 weeks to prep, so I focused entirely on the company-tagged lists here. If you're targeting L5+, don't overthink it."
"Coaches and bootcamp prep courses cost around $200-300 but PracHub Premium is actually less than a Netflix subscription. And it landed me a $178K offer."
"I honestly don't know how you guys gather so many real interview questions. It's almost scary. I walked into my Amazon loop and recognized 3 out of 4 problems from your database."
"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."
"The search is what sold me. I typed in a really niche DP problem I got asked last year and it actually came up, full breakdown and everything. These guys are clearly updating it constantly."
Segment a message with width-constrained suffixes
Given a message string s and an integer width W, split s into consecutive segments and append a suffix "i/n" to each segment indicating its 1-indexed ...
Compute pipeline order from dependencies
You are given a set of pipelines and a list of directed dependency pairs (A, B) meaning pipeline A depends on pipeline B and therefore B must run befo...
Debug a Hive Query for DAU
You are given two Hive tables: users(user_id BIGINT, created_at TIMESTAMP) and events(user_id BIGINT, event_time TIMESTAMP, event_name STRING) PARTITI...
Solve four algorithm design tasks
Solve the following four algorithmic tasks: 1) Implement wildcard pattern matcher: Given a text s and a pattern p where '?' matches any single charact...
Solve array and tree algorithm challenges
Solve the following three algorithmic tasks: 1) Unique triplet sum: Given an integer array nums and an integer target (default 0), return all unique t...
Fix a BST with two misplaced keys
Fix a BST with two misplaced keys You are given the root of a binary search tree in which exactly two nodes’ keys were accidentally swapped. Restore t...
Implement distinct islands and sliding maxima
Implement distinct islands and sliding maxima 1) Given a binary grid where 1 represents land and 0 represents water, count how many distinct island sh...
Explain multithreading and locks
Explain multithreading and locks Multithreading, Locks, Concurrency Hazards, and a Bounded Queue Design Context: Technical screen for a software engin...
Solve message splitting and board crushing
Question LeetCode 2468. Split Message Based on Limit – Given a message string and a per-line width, split it into parts adding the suffix "<i/n>" (e.g...
Calculate Monthly Conversion Rate and Average Order Value
page_views +-----------+---------+---------------------+ | user_id | page_id | view_timestamp | +-----------+---------+---------------------+ |...
Analyze Posting Behavior by Cohort and Date
creator_post +------------+---------+------+ | post_date | user_id | post | +------------+---------+------+ | 2023-01-01 | 111 | 1 | | 2023-01...
Calculate Day-7 Retention Rate from User Post Data
post_activity +---------+------------+-------+ | user_id | post_date | posts | +---------+------------+-------+ | 1 | 2023-01-01 | 3 | | 1 ...
Identify Repeat Advertisers from Consecutive Weeks
SUBMISSIONS +--------------+-----------+-----------+ | advertiser_id| ad_id | week_id | +--------------+-----------+-----------+ | A123 ...
Solve intervals and distinct islands
Question LeetCode 56. Merge Intervals LeetCode 694. Number of Distinct Islands https://leetcode.com/problems/merge-intervals/description/ https://leet...
Format messages with paginated suffixes
You are given a message string s and an integer width w. Split s into multiple chunks, preserving character order, and append a suffix "i/n" to each c...
Implement a match-3 board resolver
Question Implement a match-3 board resolver (the core loop of a "candy crush"-style game). You are given an m×n grid of cells. Each cell holds a value...
Explain Java DI, AOP, and transactions
Explain how dependency injection and AOP proxies are implemented in a modern Java framework such as Spring: bean lifecycle (creation, post-processing,...
Parse chemical formula with multipliers
Parse chemical formula with multipliers Given a string representing a chemical formula, parse it and return the total count of each element. The formu...
Write complex SQL for cohorts and retention
Given tables users(uid, created_at, country), orders(order_id, uid, amount, created_at, status), and events(uid, ts, event_type, campaign), write one ...
Debug a Hive insert query
Given a Hive table schema and an incoming table plus an INSERT/SELECT statement meant to inject data, identify why the query fails and provide step-by...