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 ScientistAggregate radiology spend and derive fiscal month
Using Python/pandas, complete the tasks below. Assume the following CSV-like input, where service_dt is object dtype and amounts may be negative (adju...
Data Manipulation (SQL/Python)
0
0
8 people solved
Oct 13, 2025
Medium
Data ScientistImplement and extend My Calendar III
Design and implement a booking system like LeetCode 732 (My Calendar III). Provide a class with methods: book(start, end) using half-open intervals [s...
Coding & Algorithms
6
0
102 people solved
Oct 13, 2025
Medium
Data ScientistAnalyze time-zoned events with pandas
You are given two pandas DataFrames. events columns: user_id:int, ts:str ISO-8601 with timezone (e.g., '2025-08-31T23:58:43-07:00'), event:str in {'si...
Data Manipulation (SQL/Python)
16
0
257 people solved
Oct 13, 2025
Medium
Data ScientistWrite SQL for 7-day geo-localized revenue dashboard
Write a single SQL query (assume PostgreSQL; tz_offset is an integer hour offset from UTC) to compute a 7-day dashboard by local user date for US vs A...
Data Manipulation (SQL/Python)
0
0
9 people solved
Oct 13, 2025
Medium
Data ScientistTransform retail data with pandas groupby/merge/concat
Using pandas only (groupby/agg/merge/concat; no for-loops), write code to answer the sub-questions below on the following small dataframes. Assume tim...
Data Manipulation (SQL/Python)
0
0
1 people solved
Oct 13, 2025
Medium
Data ScientistImplement weighted sampling without replacement
Implement in Python a function sample_k(items, weights, k) that returns k items without replacement with probability proportional to weight. Requireme...
Coding & Algorithms
8
0
121 people solved
Oct 13, 2025
Medium
Data ScientistLabel new vs old users over time in SQL
Define users as “new” during the first 30 days inclusive after their signup_date, and “old” thereafter. Produce per-user, per-day labels over a window...
Data Manipulation (SQL/Python)
0
1
5 people solved
Oct 13, 2025
Hard
Data ScientistDefine metrics and design experiments for notifications
Analytics/Experimentation Case: "Your friend is attending a local event—join them?" You are evaluating a proposed notification: "Your friend is attend...
Analytics & Experimentation
4
0
30 people solved
Oct 13, 2025
Medium
Data ScientistWrite SQL to compute max-overlap lists
Invented schema and sample data below. Assume 'today' is 2025-09-01 and 'last 7 days' means 2025-08-26 through 2025-09-01 inclusive. Only consider lis...
Data Manipulation (SQL/Python)
0
0
9 people solved
Oct 13, 2025
Medium
Data ScientistFind list pair with maximum overlap
You are given N labeled lists of items as a Python dict mapping list_name -> iterable of strings. Example input: {'L1': ['A','B','C'], 'L2': ['A','C',...
Coding & Algorithms
5
0
90 people solved
Oct 13, 2025
Medium
Data ScientistWrite SQL for engagement and attribution KPIs
Using the schema and sample data below, answer the SQL tasks. Assume timestamps are UTC and comments with is_deleted=1 do not count. Schema: users(use...
Data Manipulation (SQL/Python)
1
0
8 people solved
Oct 13, 2025
Hard
Data ScientistInvestigate visit–report correlation causality
Causal Diagnosis: Do More Ad Page Visits Cause More Reports? Context You observe a positive correlation between the number of ad page visits and the p...
Analytics & Experimentation
3
0
48 people solved
Oct 13, 2025
Medium
Data ScientistCompute and rank top bad advertisers
SQL on ad safety. Assume the following schema and sample rows. Use ANSI SQL. Today is 2025-09-01; interpret “last 7 days” as 2025-08-26 00:00:00 to 20...
Data Manipulation (SQL/Python)
2
0
10 people solved
Oct 13, 2025
Medium
Data ScientistImplement R dplyr simulation and left join
Using R and dplyr, run a simulation and a join. Data: prices item_id | price_usd 1 | 10.00 2 | 20.00 3 | 30.00 4 | 40.00 catalog item_id | category 1 ...
Data Manipulation (SQL/Python)
0
0
8 people solved
Oct 13, 2025
Medium
Data ScientistCalculate posts per DAU by country today
Given two tables: - user_activity(user_id INT, activity_date DATE, country STRING, dau_flag TINYINT CHECK(dau_flag IN (0,1))) - composer(user_id INT, ...
Data Manipulation (SQL/Python)
4
0
42 people solved
Oct 13, 2025
Medium
Data ScientistCompute daily post success rate for last 7 days
You have a table composer(user_id INT, event STRING CHECK(event IN ('enter','post','cancel')), event_date DATE). Compute the post success rate for eac...
Data Manipulation (SQL/Python)
7
1
45 people solved
Oct 13, 2025
Medium
Data ScientistWrite SQL for geo posting-frequency drops
Using the schema below, write a single ANSI SQL query (window functions allowed) that identifies countries with the largest share of creators whose po...
Data Manipulation (SQL/Python)
11
0
89 people solved
Oct 13, 2025
Medium
Data Scientist LockedDesign a creator posting-frequency experiment
This question evaluates experimental design and causal inference competencies for a Data Scientist, including precise metric definition, randomization...
Analytics & Experimentation
4
0
38 people solved
Oct 13, 2025
Medium
Data ScientistWrite SQL to compute shop visibility share
Assume today is 2025-09-01. Compute the top 3 shops by average daily visibility share over the last 7 days (2025-08-26 to 2025-09-01, inclusive) for U...
Data Manipulation (SQL/Python)
3
0
68 people solved
Oct 13, 2025
Medium
Data ScientistWrite SQL window functions for streaks
Assume today is 2025-09-01. Using standard SQL (e.g., PostgreSQL), answer the following using window functions only (no procedural loops, no correlate...
Data Manipulation (SQL/Python)
0
0
5 people solved
Oct 13, 2025