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
Data ScientistBuild a robust ML pipeline
You inherit an ML pipeline that predicts next-7-day churn for users, but data quality is inconsistent and feature drift is suspected. A) Propose an en...
Machine Learning
11
0
87 people solved
Oct 13, 2025
Medium
Data ScientistWrite rolling-window SQL over weekly cohorts
You have two tables: users and transactions. Write a single SQL query (use CTEs) to produce, for each calendar week and user, weekly_revenue, a 4-week...
Data Manipulation (SQL/Python)
1
0
13 people solved
Oct 13, 2025
Medium
Data ScientistSenior+Write SQL for post-trial conversion cohorts
Using the schema below, write SQL to compute, for users first exposed between 2025‑06‑01 and 2025‑06‑30 (inclusive), the intent‑to‑treat paid conversi...
Data Manipulation (SQL/Python)
2
0
16 people solved
Oct 13, 2025
Medium
Data ScientistImpute missing values without leakage
Given a DataFrame df with columns: user_id, event_date (datetime), country (categorical), device_type (categorical), age (numeric), income (numeric), ...
Data Manipulation (SQL/Python)
0
0
8 people solved
Oct 13, 2025
Medium
Data ScientistCompute two conditional probability scenarios
Probability — Two-Part Question Solve both parts. Show formulas and provide final numeric values. Part A — Coin Type Given HHH - A box has 5 coins: 3 ...
Statistics & Math
2
0
44 people solved
Oct 13, 2025
Medium
Data ScientistUnify 7 tables and impute missing values
Using pandas, write a robust function unify_orders(...) that ingests seven dataframes (or CSVs) with possibly inconsistent column casing/whitespace an...
Data Manipulation (SQL/Python)
1
0
10 people solved
Oct 13, 2025
Medium
Data ScientistCompute posterior and predictive coin probabilities
Bayesian coin: posterior, prediction, and stopping-time expectation Context - You have two coins and will use the same coin for all flips: - Fair co...
Statistics & Math
16
0
123 people solved
Oct 13, 2025
Hard
Data ScientistReduce overfitting under constraints
Reduce Overfitting Under Latency Constraints (Tabular Regression) Context (assumed) - You have a tabular regression model with a large generalization ...
Machine Learning
6
0
82 people solved
Oct 13, 2025
Medium
Data ScientistAnalyze daily comments distribution and sampling
Daily Comments per Active User: Sampling and Inference You have, for a given day d, the count of comments made by each active user. Let there be m act...
Statistics & Math
7
0
51 people solved
Oct 13, 2025
Hard
Data ScientistBuild dashboard; diagnose engagement–purchase gap
Build a Comprehensive Dashboard for the Shopping Tab (Organic Only) Context Assume the Shopping tab is an in-app surface for organic product discovery...
Analytics & Experimentation
4
0
35 people solved
Oct 13, 2025
Hard
Data ScientistEstimate revenue of organic shopping tab
Estimate Monthly Revenue for a New Shopping Tab (Organic Only) Context You are evaluating the potential monthly revenue impact of launching a new Shop...
Analytics & Experimentation
4
0
35 people solved
Oct 13, 2025
Medium
Data ScientistCompute callers contacting >3 people last 7 days
Using the schema below, write a single SQL query to return the number of unique callers who started calls with more than 3 distinct other users during...
Data Manipulation (SQL/Python)
0
0
6 people solved
Oct 13, 2025
Medium
Data ScientistCalculate annual percentages and YoY by cohorts
Answer both SQL and Python parts. Be precise about deduping and denominator choices. SQL schema (sample rows): orders order_id | user_id | order_date ...
Data Manipulation (SQL/Python)
10
0
76 people solved
Oct 13, 2025
Medium
Data Scientist LockedDerive paying users over time with churn
This question evaluates the ability to model user conversion and churn with discrete-time recurrence relations, derive closed-form expressions for pay...
Statistics & Math
5
0
76 people solved
Oct 13, 2025
Hard
Data ScientistDesign and power an incentive experiment
Experiment: Timing and Efficacy of Onboarding Benefits Context You operate a two-sided marketplace with supply-side candidates who often complete requ...
Analytics & Experimentation
13
0
83 people solved
Oct 13, 2025
Medium
Data ScientistCritique culture memo and design probes
Interpreting a Company Culture Memo (Data Scientist, HR Screen) You are interviewing for a Data Scientist role at a tech company that publishes a publ...
Behavioral & Leadership
18
0
133 people solved
Oct 13, 2025
Medium
Data ScientistWrite SQL for cold-complaint diagnostics with LAG/QUALIFY
Using BigQuery/Snowflake-style SQL (CTEs required; use LAG and QUALIFY), answer the tasks below. Assume 'today' is 2025-09-01. Schema and small sample...
Data Manipulation (SQL/Python)
2
0
9 people solved
Oct 13, 2025
Hard
Data Scientist LockedDesign analysis to reduce cold-delivery complaints
This question evaluates a data scientist's end-to-end analytics and experimentation competencies, including precise metric definition, causal diagnost...
Analytics & Experimentation
8
0
75 people solved
Oct 13, 2025
Hard
Data ScientistChoose group-call size cap via experiment
Decide the Maximum Participants per Group Call: Experiment Plan Context: You need to choose a default cap for group calls (maximum concurrent particip...
Analytics & Experimentation
2
0
38 people solved
Oct 13, 2025
Hard
Data ScientistDesign analytics and experiment for group video calls
Evaluate and Launch Group Video Calls — Product Analytics Plan Context: You are evaluating a new Group Video Call feature in a large-scale consumer me...
Analytics & Experimentation
8
0
56 people solved
Oct 13, 2025