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 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
Medium
Data ScientistDemonstrate leadership, innovation, and learning via STAR
Behavioral & Leadership (Data Scientist, HR Screen) Instructions Answer each prompt concisely using the STAR format (Situation, Task, Action, Result)....
Behavioral & Leadership
7
0
52 people solved
Oct 13, 2025
Medium
Data Scientist LockedCompute capacity, staffing trade-offs, and break-even
This question evaluates capacity-planning, bottleneck identification, labor-cost trade-offs, contractor vs overtime comparisons, break-even computatio...
Analytics & Experimentation
5
0
53 people solved
Oct 13, 2025
Medium
Data ScientistDesign an idempotent SQL ETL for late data
You own the daily_user_metrics fact table. Build an idempotent, rerunnable ETL that can be triggered for any date D and correctly handles duplicates, ...
Data Manipulation (SQL/Python)
1
0
11 people solved
Oct 13, 2025
Medium
Data ScientistWrite SQL to monitor weekly chargeback spikes
Write a single SQL query (PostgreSQL) to detect weekly chargeback spikes by country and industry. Week starts Monday (use date_trunc('week', ts) with ...
Data Manipulation (SQL/Python)
0
0
5 people solved
Oct 13, 2025
Medium
Data ScientistCompute unit economics and insurance break-even
Subscription unit economics and insurance math. Assume no discounting and ignore taxes unless stated. Part A (15-month term): A subscription service c...
Statistics & Math
6
0
67 people solved
Oct 13, 2025
Medium
Data ScientistDescribe an accomplishment with quantified impact
Describe one professional accomplishment you are most proud of from the past two years. Make it audit-ready by covering: goal, measurable target, cons...
Behavioral & Leadership
3
0
33 people solved
Oct 13, 2025
Medium
Data ScientistMinimize L2, L1, and quantile losses
Given an array X of n real numbers, derive the value θ that minimizes the sum of squared deviations Σ(xi−θ)² (mean) and the sum of absolute deviations...
Coding & Algorithms
7
0
64 people solved
Oct 13, 2025
Medium
Data ScientistBuild and evaluate bad-link classifier
You have 1,000 URLs labeled as bad or good and a much larger unlabeled pool, with bad links rare. Design features and train a logistic regression. Exp...
Machine Learning
5
0
97 people solved
Oct 13, 2025
Medium
Data ScientistGenerate binomial matrix and column-normalize
Using Python with NumPy, generate a 100×100 matrix of Binomial(n = 10, p = 0.3) draws with a fixed random seed, then normalize each column so it sums ...
Data Manipulation (SQL/Python)
0
0
6 people solved
Oct 13, 2025
Medium
Data ScientistDescribe toughest project and align stakeholders remotely
Describe the single most challenging data science project you led end-to-end in the last 24 months. In 90 seconds, state: the business goal, exact sco...
Behavioral & Leadership
3
0
49 people solved
Oct 13, 2025
Medium
Data ScientistWrite SQL for hashtag source and safety rates
Write SQL for the two tasks below. Assume the schema and sample data as given, and that “today” is 2025‑09‑01. Deduplicate exact duplicates by (date, ...
Data Manipulation (SQL/Python)
0
0
10 people solved
Oct 13, 2025
Hard
Data Scientist LockedDesign hashtag recommender with cold start
This question evaluates expertise in recommender-system design, feature engineering, ranking and learning-to-rank models, cold-start strategies, evalu...
Machine Learning
3
0
41 people solved
Oct 13, 2025
Medium
Data ScientistFind daily first-order merchants with SQL
Given the table below, write a single SQL query using window functions to: A) For each calendar date (UTC), return all merchant_id(s) whose order is t...
Data Manipulation (SQL/Python)
1
1
11 people solved
Oct 13, 2025
Medium
Data ScientistCompute join counts and window ranks
Given the following small schema and data, answer all parts precisely and justify each count/output. Tables and rows: Customers(cust_id INT PRIMARY KE...
Data Manipulation (SQL/Python)
7
0
60 people solved
Oct 13, 2025
Medium
Data ScientistDesign idempotent daily loads with deduping
You need to load the last 7 days of orders into a large fact table from a noisy staging feed. Assume today is 2025-09-01. Requirements: idempotent rer...
Data Manipulation (SQL/Python)
3
0
59 people solved
Oct 13, 2025