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
Hard
Software EngineerSolve common array/string/linked-list tasks
You may be asked one or more of the following independent coding tasks. For each task, implement an efficient algorithm and clearly state time/space c...
Coding & Algorithms
5
0
46 people solved
Oct 21, 2025
Easy
Data ScientistCompute win probability in coin-toss game
Two players, A and B, play the following game with a fair coin: - They toss the coin alternately: A tosses first, then B, then A, then B, and so on. -...
Coding & Algorithms
2
0
45 people solved
Oct 21, 2025
Medium
Software EngineerValidate parentheses with one or three bracket types
Problem Given a string s consisting only of bracket characters, determine whether it is valid. A string is valid if: - Every opening bracket has a cor...
Coding & Algorithms
5
1
65 people solved
Oct 20, 2025
Medium
Data ScientistMatch payments to invoices by memo or amount
You are building a small payment-to-invoice matching utility. Data You are given: - invoices: a list of invoice records with: - invoice_id (string) ...
Coding & Algorithms
5
0
51 people solved
Oct 19, 2025
Hard
Data EngineerCount islands using BFS without modifying grid
You are given an m x n binary grid grid where: - 1 represents land - 0 represents water - Islands are groups of horizontally or vertically adjacent la...
Coding & Algorithms
6
0
74 people solved
Oct 19, 2025
Medium
Software EngineerPrint directory tree with indentation
You are given a root directory of a filesystem represented as a tree. Each node is either a directory (can have children) or a file (no children). Pri...
Coding & Algorithms
15
0
113 people solved
Oct 18, 2025
Hard
Software Engineer LockedMinimize time using elevator then climb stairs
This question evaluates a candidate's ability to model and optimize a discrete decision under resource constraints, testing algorithmic optimization, ...
Coding & Algorithms
10
0
94 people solved
Oct 18, 2025
Easy
Software EngineerFind all cells reachable by downhill flow
Problem You are given an m x n grid heights, where heights[r][c] is the elevation of cell (r, c). A drop of water is placed at a starting cell start =...
Coding & Algorithms
9
0
58 people solved
Oct 18, 2025
Medium
Software EngineerImplement hierarchical folder access check
You are asked to simulate a simple hierarchical file system and implement an access-check function. The file system consists of folders arranged in a ...
Coding & Algorithms
8
0
85 people solved
Oct 18, 2025
Medium
Software EngineerAggregate expenses by person, trip, and category
Problem You are given a list of expense records. Each record has: - employee_id (string) - trip_id (string) - category (string, e.g., MEAL, HOTEL, TRA...
Coding & Algorithms
20
0
314 people solved
Oct 17, 2025
Hard
Data ScientistInternRelate coefficients under linear feature transformation
Suppose you are fitting a linear regression model and you consider two different feature parameterizations. Original features: x1, x2. Transformed fea...
Statistics & Math
7
0
54 people solved
Oct 14, 2025
Hard
Data ScientistInternFind top-5 most similar rows across datasets
You are given two datasets with the same feature columns: - source (rows you want to match): - source_id (STRING/INT) - f1...fk (NUMERIC; may cont...
Coding & Algorithms
2
0
45 people solved
Oct 14, 2025
Hard
Software EngineerNew Grad LockedFind numbers with exactly two sum-of-squares forms
This question evaluates understanding of integer representations as sums of two squares and the ability to reason about counting distinct unordered re...
Coding & Algorithms
9
0
64 people solved
Oct 14, 2025
Medium
Software EngineerDesign cache with least-recently-used eviction
You are asked to design an in-memory key–value cache that supports a least-recently-used (LRU) eviction policy. The cache must support the following o...
Coding & Algorithms
3
0
38 people solved
Oct 14, 2025
Hard
Software EngineerRank queries by prefix, frequency, and time
You are given three arrays of the same length n: - queries[i]: a non-empty string representing the text of the i-th query. - timestamps[i]: an integer...
Coding & Algorithms
32
0
290 people solved
Oct 14, 2025
Hard
Data Scientist LockedValidate in-post restaurant recommendations via experiment
This question evaluates a data scientist's competency in experimental design for recommendation systems, including defining viewer- and creator-level ...
Analytics & Experimentation
1
0
22 people solved
Oct 13, 2025
Medium
Data ScientistWrite SQL to analyze shop visibility
You are given two tables. Use standard SQL (window functions allowed). Assume "today" is 2025-09-01 and that “currently visible” means a shop’s last s...
Data Manipulation (SQL/Python)
1
0
2 people solved
Oct 13, 2025
Medium
Data Scientist LockedCompute and interpret quantile loss vs RMSE
This question evaluates competency in probabilistic forecasting evaluation, including understanding of quantile (pinball) loss versus point-error metr...
Statistics & Math
10
0
76 people solved
Oct 13, 2025
Medium
Data ScientistWrite SQL to compute campaign net revenue
Using the schema and sample data below, write SQL to produce, for each campaign_id and segment, the following metrics for August 2025: total_reached, ...
Data Manipulation (SQL/Python)
17
0
122 people solved
Oct 13, 2025
Medium
Data ScientistFind top category by video time spent
Pandas required. You are given a DataFrame df with columns: user_id (int), pin_id (int), pin_type (str), category (str or None), time_spent_sec (numer...
Data Manipulation (SQL/Python)
19
0
140 people solved
Oct 13, 2025