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 shop visibility and activity metric
Assume 'today' is 2025-09-01. Schema and tiny samples: 1) shops(shop_id INT, created_at DATE) Sample: shop_id | created_at 1 | 2025-08-25 2 | 2025...
Data Manipulation (SQL/Python)
0
0
6 people solved
Oct 13, 2025
Medium
Data ScientistDefine composite success for search and test it
A new search feature is evaluated with two binary labels per query: relevancy=1/0 and accuracy=1/0. 1) Propose a composite success metric that uses th...
Analytics & Experimentation
2
0
30 people solved
Oct 13, 2025
Hard
Data Scientist LockedDrive app installs from web traffic
This question evaluates experimentation design, funnel and metric specification, attribution and incrementality measurement, segmentation, and causal ...
Analytics & Experimentation
9
0
121 people solved
Oct 13, 2025
Medium
Data ScientistCompute rolling cold-delivery rates with windows
Assume a food-delivery platform with the following schema. Use PostgreSQL. A delivery is considered "cold" if food_temp_c < 40 at dropoff OR there is ...
Data Manipulation (SQL/Python)
0
0
7 people solved
Oct 13, 2025
Medium
Data ScientistClean and aggregate factory event data in Pandas
You are given three Pandas DataFrames for a factory: (1) events[event_id, machine_id, ts_utc (datetime64[ns, UTC]), event_type in {'start','stop','fau...
Data Manipulation (SQL/Python)
0
0
8 people solved
Oct 13, 2025
Medium
Data ScientistSenior+Implement streaming k-way merge with constraints
Implement a function merge_k(iterators, N) that returns the first N items of the global ascending order from k sorted, potentially unbounded iterators...
Coding & Algorithms
6
0
86 people solved
Oct 13, 2025
Medium
Data ScientistFind top-spend categories per customer with ranking
Using the schema and sample data below, write a single ANSI SQL query (CTEs allowed; no temp tables) that returns, for each customer, their top 2 prod...
Data Manipulation (SQL/Python)
2
0
43 people solved
Oct 13, 2025
Hard
Data ScientistDiagnose rising account switching and falling actives
Diagnostic Plan: Account Switching Up, Active Users Down Context You observed a sudden pattern: the number of users switching accounts increased, whil...
Analytics & Experimentation
3
0
33 people solved
Oct 13, 2025
Medium
Data ScientistCompute monthly CRR with merges and gaps
You are given PostgreSQL tables user_profile(user_id, signup_ts, country, is_employee, is_test), user_events(user_id, event_ts, event_type, revenue, p...
Data Manipulation (SQL/Python)
10
0
131 people solved
Oct 13, 2025
Medium
Data ScientistCreate and query an e-commerce schema
PostgreSQL only. 1) Create these tables with appropriate types and constraints (choose minimal correct types): products(product_id PK, name NOT NULL, ...
Data Manipulation (SQL/Python)
4
0
66 people solved
Oct 13, 2025
Medium
Data ScientistDescribe accomplishment, failure, and helping others
Provide three distinct examples from the last 24 months: (1) Your most consequential accomplishment—context, specific goal, constraints, your actions,...
Behavioral & Leadership
3
0
30 people solved
Oct 13, 2025
Medium
Data ScientistCompute survey rates and bias-correct ratings
Today is 2025-09-01. Use the schema and sample data below to answer A and B with SQL (standard SQL; you may use CTEs and window functions). Assume tim...
Data Manipulation (SQL/Python)
3
0
55 people solved
Oct 13, 2025
Medium
Data Scientist LockedDecide event notification launch via experiments
This question evaluates a data scientist's competency in experimentation design, causal inference under network interference, metric engineering, and ...
Analytics & Experimentation
3
0
37 people solved
Oct 13, 2025
Medium
Data ScientistImplement min, mean, median robustly
Implement three functions in Python without using numpy/pandas: (1) my_min(nums) returning the minimum in O(n) time and O(1) space; (2) my_mean(nums) ...
Coding & Algorithms
4
0
41 people solved
Oct 13, 2025
Medium
Data ScientistReview checkout code for defects and privacy
You are reviewing a supermarket checkout implementation. Identify and prioritize issues and fixes across: (a) monetary correctness (avoid floating poi...
Coding & Algorithms
4
0
70 people solved
Oct 13, 2025
Medium
Data Scientist LockedDesign ML deployment with GitHub and Jenkins
This question evaluates MLOps and production machine learning engineering competencies, covering repository and environment management, model and data...
Machine Learning
5
0
51 people solved
Oct 13, 2025
Medium
Data ScientistDeduplicate events and rank products with SQL
You are given two tables. Schema: - events(event_id INT PRIMARY KEY, user_id INT, product_id INT, event_time TIMESTAMP, idempotency_key TEXT, amount_c...
Data Manipulation (SQL/Python)
1
0
10 people solved
Oct 13, 2025
Medium
Data ScientistWrite SQL for hashtag analytics and joins
Assume today = 2025-09-01. Schema and small sample data are below. Use ANSI SQL; explain any dialect-specific functions you choose. Where asked, expla...
Data Manipulation (SQL/Python)
1
0
2 people solved
Oct 13, 2025
Medium
Data ScientistWrite SQL to localize anomaly and funnel
Given the schema and toy data below, write SQL to (a) validate instrumentation vs behavior change, (b) localize the 2025-09-01 Likes drop by app_versi...
Data Manipulation (SQL/Python)
0
0
5 people solved
Oct 13, 2025
Hard
Data Scientist LockedDesign and analyze end-to-end A/B test
This question evaluates experimentation design and analysis competencies for A/B testing, including metric selection, statistical interpretation, inte...
Analytics & Experimentation
3
0
27 people solved
Oct 13, 2025