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."
Identify Repeat Advertisers from Consecutive Weeks
SUBMISSIONS +--------------+-----------+-----------+ | advertiser_id| ad_id | week_id | +--------------+-----------+-----------+ | A123 ...
Calculate Conversion Rate from Ad Clicks to Page Visits
user_events | user_id | event_time | event_type | ad_id | |---------|----------------------|------------|-------| | 1 | 2023-01-01 10:...
Select 10% Users Randomly from User Table
users +----+----------+-------------+ | id | username | signup_date | +----+----------+-------------+ | 1 | alice | 2023-01-02 | | 2 | bob ...
Design query generation to maximize CTR
Question Design an end-to-end query-generation system that maximizes click-through rate (CTR) for a large-scale search/recommendation product. Walk th...
Explain a SQL query result
Given two tables and a specific SQL query, precisely explain the expected result set: which rows are returned, what each column contains, how joins/fi...
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...
Compute Averages of Unique Numbers in Dictionary Lists
Scenario Python tech screen: given a dictionary mapping keys to numeric lists, e.g., {'a':[1,2,1],'b':[1,2,3]}, compute the average of each list after...
Calculate User Registration Date and 7-Day Retention Rate
user_posts +---------+--------------+-----------+ | user_id | posting_date | num_posts | +---------+--------------+-----------+ | 1 | 2023-01-01...
Identify Top Discounts and Monitor Code Submissions
Products +------------+----------+-------+----------+ | product_id | category | price | discount | +------------+----------+-------+----------+ | 101 ...
Investigate Traffic Distribution Impact on Retention Decrease
A/B Test Diagnostics: Did Traffic Distribution Cause the Retention Drop? Context An A/B test changed a button's color from green (control) to red (tre...
Maximize Distinct Purchases Within Budget Constraints
Scenario Given a customer budget and a list of product prices, determine the maximum number of distinct products the customer can afford. Question Des...