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 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
Medium
Data ScientistImplement an LRU cache with O(1) ops
Design and code an LRU cache supporting get(key) and put(key, value) in O(1) average time with capacity N. Specify your data structures, handle update...
Coding & Algorithms
5
0
43 people solved
Oct 13, 2025
Medium
Data ScientistOptimize SaaS pricing and profit
SaaS Pricing: Linear Demand, Capacity Constraint, and Subscription Churn Context: You are pricing a single-seat SaaS product (one seat per customer pe...
Analytics & Experimentation
7
0
72 people solved
Oct 13, 2025
Medium
Data ScientistWrite SQL for cohort retention and ARPU
Using PostgreSQL, compute monthly signup cohort D30 retention and 30-day ARPU. Cohort month = date_trunc('month', signup_date). D30 retention = users ...
Data Manipulation (SQL/Python)
2
0
48 people solved
Oct 13, 2025
Medium
Data ScientistDecide whether to partner with Groupon
Decision: Partner with Groupon (Restaurant Unit Economics) Context You are the restaurant owner evaluating a Groupon partnership. The offer structure ...
Behavioral & Leadership
3
0
40 people solved
Oct 13, 2025
Medium
Data ScientistCompare Instagram vs. Facebook using causal experiments
Compare Instagram and Facebook for consumer time and engagement: a) Define a single-objective OEC that captures healthy cross-app ecosystem value with...
Analytics & Experimentation
3
0
39 people solved
Oct 13, 2025
Medium
Data ScientistWrite dating profile report with final reviews
Today is 2025-09-01. You need a daily dating-profile quality and engagement report that only includes profiles whose latest version has a final approv...
Data Manipulation (SQL/Python)
8
0
55 people solved
Oct 13, 2025
Medium
Data ScientistDetect sessions and gaps using SQL LEAD
Write a single ANSI-SQL query that (a) assigns per-user session_ids when the gap between consecutive events exceeds 30 minutes, (b) computes session_s...
Data Manipulation (SQL/Python)
26
0
200 people solved
Oct 13, 2025
Medium
Data ScientistIdentify country with highest sunny-day probability
Write SQL to find the country with the highest probability that a day is sunny. Use the schema and sample data below. Rules: consider a day sunny for ...
Data Manipulation (SQL/Python)
10
1
82 people solved
Oct 13, 2025
Medium
Data Scientist LockedCompute break-even and simulate diaper inventory
This question evaluates quantitative modeling skills including break-even and contribution-margin analysis, inventory simulation, and operational leve...
Statistics & Math
4
0
53 people solved
Oct 13, 2025
Medium
Data ScientistQuery and transform marketplace data in SQL/Python
Assume today is 2025-09-01. Use the following schema and sample data to answer the questions with both SQL (preferred) and equivalent Python (pandas) ...
Data Manipulation (SQL/Python)
0
0
5 people solved
Oct 13, 2025
Medium
Data ScientistCount buggy vs non-buggy by employer
Count buggy vs non-buggy submissions for each employer_id, including employers with zero submissions. Return employer_id, buggy_count, non_buggy_count...
Data Manipulation (SQL/Python)
1
0
10 people solved
Oct 13, 2025
Medium
Data ScientistSelect max-discount product per category
You have a catalog of products. For each category, return exactly one product: the one with the largest absolute discount; if multiple products in the...
Data Manipulation (SQL/Python)
1
0
10 people solved
Oct 13, 2025
Medium
Data ScientistWrite SQL for top student per department
Schema: Departments(dept_id PK, dept_name) Students(student_id PK, student_name, dept_id FK nullable, gpa numeric(3,2) nullable, enrolled_at date) Sam...
Data Manipulation (SQL/Python)
0
0
7 people solved
Oct 13, 2025
Medium
Data ScientistWrite SQL to verify quarterly sales decline
You are given a single dataset for a beverage company and must decide whether Q2 2024 truly declined. Write one standard SQL query that produces a com...
Data Manipulation (SQL/Python)
0
0
6 people solved
Oct 13, 2025