Interview Questions
Practice the exact questions companies are asking right now.
Questions
10.0k
Companies
520
Updated
08.21.2026
10.0k Questions 520 Companies08.21.2026
PLTCHK
"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"
_The_TaNk_
"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"
ChrisSenior SWE, LinkedIn
"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."
sleepy33
"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."
JakeSenior ML Engineer, Lyft
"Got a Google recruiter call on Monday, interview on Friday. Crammed PracHub for 4 days. Passed every round. This platform is a miracle worker."
nuggetlord
"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."
CarlosFull Stack, Shopify
"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."
boba.tea.vibes
"Legit the only resource you need. TC went from 180k -> 350k. Just memorize the top 50 for your target company and you're golden."
AndySWE-II, Google
"PracHub Premium for one month cost me the price of two coffees a week. It landed me a $280K+ starting offer."
couchpotato99
"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."
ShrutiData Engineer, Salesforce
"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."
midnightramen
"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."
BiancaFrontend Eng, Figma
"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."
tambrahm007
"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."
toa
"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."
Showing 20 results
Role
Medium
Machine Learning Engineer LockedCompute moving and weighted averages from a stream
This question evaluates a candidate's understanding of streaming algorithms, sliding-window statistics, and resource-constrained data structure design...
Coding & Algorithms
3
0
37 people solved
Oct 15, 2025
Medium
Machine Learning Engineer LockedAssign bookings to minimum tennis courts
This question evaluates interval scheduling and resource-allocation competencies, testing algorithmic and data-structure knowledge for handling time-i...
Coding & Algorithms
3
0
35 people solved
Oct 15, 2025
Medium
Software EngineerValidate a bracket string
Given a string s containing only the characters '(', ')', '{', '}', '[', and ']', determine whether the input string is valid. A string is valid if: 1...
Coding & Algorithms
5
0
39 people solved
Oct 14, 2025
Medium
Data ScientistCompute posterior fake probability using Bayes' rule
A platform runs an automated detector to flag fake accounts. - Prior probability an account is fake: \(P(F)=0.02\). - True positive rate (sensitivity)...
Statistics & Math
10
0
74 people solved
Oct 14, 2025
Easy
Data ScientistAnswer ambiguity and PM disagreement behavioral questions
Behavioral questions 1) Describe a time you worked on a problem with high ambiguity (unclear goals, incomplete data, shifting requirements). What did ...
Behavioral & Leadership
5
0
54 people solved
Oct 14, 2025
Easy
Data Scientist LockedDiagnose metric anomalies and evaluate new algorithm
This question evaluates competency in analytics-driven incident investigation, experiment design, metric instrumentation, and product-metric interpret...
Analytics & Experimentation
5
0
51 people solved
Oct 14, 2025
Medium
Software EngineerBuild a time-based key-value store
Problem Design a data structure that stores multiple values for the same key at different timestamps, and can retrieve the most recent value as of a g...
Coding & Algorithms
7
0
70 people solved
Oct 14, 2025
Medium
Data ScientistSolve queue switch and coin change puzzles
This entry contains two separate interview-style quantitative/algorithmic questions. --- 1. Queue switching decision problem You are standing in a sin...
Coding & Algorithms
17
0
150 people solved
Oct 14, 2025
Medium
Data ScientistWrite SQL to analyze shop visibility
You are given two tables. Use standard SQL (window functions allowed). Assume "today" is 2025-09-01 and that “currently visible” means a shop’s last s...
Data Manipulation (SQL/Python)
1
0
3 people solved
Oct 13, 2025
Medium
Data Scientist LockedCompute and interpret quantile loss vs RMSE
This question evaluates competency in probabilistic forecasting evaluation, including understanding of quantile (pinball) loss versus point-error metr...
Statistics & Math
10
0
77 people solved
Oct 13, 2025
Medium
Data ScientistOptimize invites under capacity constraints
You have n donors (n up to 100,000). For each donor i you know: p_online[i] (probability of donating if emailed), a_online[i] (expected donation condi...
Coding & Algorithms
11
0
93 people solved
Oct 13, 2025
Medium
Data ScientistDescribe resolving ambiguity under pressure
Tell me about a time you were given an ambiguous, calculation-heavy case and the interviewer or stakeholder kept pushing you to 'not go too far.' Desc...
Behavioral & Leadership
5
0
56 people solved
Oct 13, 2025
Medium
Data ScientistWrite SQL to compute campaign net revenue
Using the schema and sample data below, write SQL to produce, for each campaign_id and segment, the following metrics for August 2025: total_reached, ...
Data Manipulation (SQL/Python)
17
0
123 people solved
Oct 13, 2025
Medium
Data ScientistDesign fundraising experiment and guardrails
You plan to A/B test two online solicitation variants for the nonprofit's email campaign (subject line + suggested amount). Assume baseline conversion...
Analytics & Experimentation
4
0
43 people solved
Oct 13, 2025
Medium
Data ScientistWrite SQL/pandas for KPI anomaly
Write SQL (and outline equivalent pandas) for a KPI anomaly investigation. Assume today = '2025-09-01'. Schema: Users(user_id INT, country TEXT, signu...
Data Manipulation (SQL/Python)
9
0
79 people solved
Oct 13, 2025
Medium
Data ScientistSize opportunity for new product line
An e-commerce site considers adding a "Home Office" product line. Before any A/B test, size the opportunity and recommend whether to proceed. Assumpti...
Analytics & Experimentation
6
0
54 people solved
Oct 13, 2025
Medium
Data Scientist LockedDiagnose a sudden KPI drop
This question evaluates operational analytics and experimentation competencies, including instrumentation and data-quality checks, de-seasonalization ...
Analytics & Experimentation
3
0
38 people solved
Oct 13, 2025
Medium
Data ScientistWrite SQL for daily chats and fast replies
You are given a messaging events table that records one row per message sent. Schema - messages( date DATE, -- calendar date of event (UTC) ts TIMES...
Data Manipulation (SQL/Python)
3
0
5 people solved
Oct 13, 2025
Hard
Data ScientistDesign experiment for fake accounts impact
Experiment Design: Removing Detected Fake Accounts and Measuring Causal Impact Context: You are designing an end-to-end experiment on a large, interac...
Analytics & Experimentation
2
0
51 people solved
Oct 13, 2025
Medium
Data ScientistDefine and query shop visibility
You are given the following schema. Use only the columns provided; do not introduce new fields or labels. Tables and columns: - shops(shop_id INT, sho...
Data Manipulation (SQL/Python)
0
0
8 people solved
Oct 13, 2025