Interview Questions
Practice the exact questions companies are asking right now.
Questions
9.8k
Companies
511
Updated
08.16.2026
9.8k Questions 511 Companies08.16.2026
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 ScientistWrite SQL for initiators and French DAU%
You are given the following PostgreSQL tables. Assume all timestamps are UTC and "today" is 2025-09-01. For any reference to "last 7 days," use the in...
Data Manipulation (SQL/Python)
0
1
6 people solved
Oct 13, 2025
Medium
Data ScientistDesign an analytic warehouse for event data
Design a warehouse-ready analytics data model and ingestion plan to support cohort retention, ARPU, and product-case analyses at scale (50M events/day...
Data Manipulation (SQL/Python)
0
0
2 people solved
Oct 13, 2025
Medium
Data ScientistSenior+Build a cohort dashboard with Streamlit and SQL
You are given three tables and asked to build a minimal Streamlit app that helps a PM explore weekly cohort retention and ARPU by country. Assume SQL ...
Data Manipulation (SQL/Python)
0
0
3 people solved
Oct 13, 2025
Medium
Data ScientistCompute last-to-previous ad impression gaps
Given impressions(ad_id INT, user_id INT, impression_ts TIMESTAMP) with multiple impressions per (user_id, ad_id), write a single SQL query to return,...
Data Manipulation (SQL/Python)
0
0
3 people solved
Oct 13, 2025
Hard
Data Scientist LockedProve conversion ads value via incrementality
This question evaluates a candidate's competency in causal inference and experimentation design for advertising measurement, covering metrics and attr...
Analytics & Experimentation
2
0
53 people solved
Oct 13, 2025
Hard
Data ScientistRoot-cause an incident and drive consensus
Root-Cause Plan: Sudden Drop in Voice Checkout Conversion (Alexa Shopping) You are informed that the "voice checkout conversion" KPI for Alexa Shoppin...
Behavioral & Leadership
7
0
55 people solved
Oct 13, 2025
Medium
Data ScientistCompute daily work hours from in/out events
Given punch events, compute each employee’s daily hours, handling unmatched events and overnight shifts. Write SQL over: events(employee_id INT, evt_t...
Data Manipulation (SQL/Python)
0
0
5 people solved
Oct 13, 2025
Medium
Data ScientistCalculate cross-channel login user proportions
Write SQL to compute, for 2025-08-29 through 2025-08-31, the proportion of users who logged in only via mobile, only via desktop, and via both, where ...
Data Manipulation (SQL/Python)
0
0
4 people solved
Oct 13, 2025
Hard
Data Scientist LockedDecide and test a 20% discount strategy
This question evaluates a data scientist's competency in incremental profit modeling, causal inference and experimentation design, heterogeneous treat...
Analytics & Experimentation
14
0
213 people solved
Oct 13, 2025
Hard
Data Scientist LockedEvaluate and test a Top Dasher program
This question evaluates skills in causal inference, experiment design under interference, decision framework development, anti-gaming and selection-bi...
Analytics & Experimentation
19
0
131 people solved
Oct 13, 2025
Hard
Data Scientist LockedMeasure Ads Manager effectiveness end-to-end
This question evaluates a candidate's competency in experimental design, causal inference, metric definition, telemetry instrumentation, and heterogen...
Analytics & Experimentation
8
0
61 people solved
Oct 13, 2025
Hard
Data ScientistImplement sqrt with Newton vs binary search
Implement numerically robust square-root routines and analyze convergence Task 1 — sqrt_newton(x, tol=1e-12) Implement a Python function that returns ...
Coding & Algorithms
7
0
138 people solved
Oct 13, 2025
Medium
Data ScientistCompare SQL counts, windows, and NULL semantics
You’re given two tables. users(id INT, country STRING, created_at DATE) rows: 1 | US | 2025-08-28 2 | US | 2025-08-30 3 | IN | 2025-08-29 4 | BR | 202...
Data Manipulation (SQL/Python)
8
0
71 people solved
Oct 13, 2025
Hard
Data Scientist LockedDesign experiments and observational alternatives
This question evaluates causal inference, experimental design, metric definition and measurement, power analysis, segmentation, and observational stud...
Analytics & Experimentation
2
0
30 people solved
Oct 13, 2025
Medium
Data ScientistWrite SQL for snapshot features and labels
Use 'today' = 2025-09-01. Invented schema (UTC): users(u_id INT, signup_dt DATE, country STRING) events(u_id INT, event_time TIMESTAMP, arrival_time T...
Data Manipulation (SQL/Python)
0
0
5 people solved
Oct 13, 2025
Medium
Data ScientistImplement fast sampling for weighted k-sided die
You must sample from a categorical distribution over k outcomes with probabilities p1..pk (sum to 1) without using built-in categorical samplers. You ...
Coding & Algorithms
4
0
89 people solved
Oct 13, 2025
Medium
Data ScientistCompute 7-day rolling complaint/order ratio in SQL
SQL only. Given the schema and sample data below, write a single Postgres query (no procedural code) to compute a 7-day rolling complaint-to-order rat...
Data Manipulation (SQL/Python)
1
0
13 people solved
Oct 13, 2025
Medium
Data ScientistWrite SQL for comment analytics
You are given the following schema and tiny sample data. Schema: - users(user_id INT PRIMARY KEY, country VARCHAR, created_at DATE) - posts(post_id IN...
Data Manipulation (SQL/Python)
0
0
6 people solved
Oct 13, 2025
Medium
Data ScientistManipulate data in R with dplyr joins and windows
Using R and dplyr, answer the following using these small tables (dates are ISO strings): transactions(user_id, order_id, order_date, channel, amount)...
Data Manipulation (SQL/Python)
0
0
5 people solved
Oct 13, 2025
Hard
Data ScientistCompute sample size and plan experiment
A/B Test Planning: Paywall Copy Change For New Signups Context You are planning an A/B test to evaluate a paywall copy change that targets new signups...
Statistics & Math
5
0
46 people solved
Oct 13, 2025