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
Backend Engineer LockedReplace Dashes With Nearest Letters
This question evaluates a candidate's competence in grid traversal, distance computation using Manhattan metrics, and handling tie-breaking rules incl...
Coding & Algorithms
0
0
11 people solved
May 25, 2026
Medium
Software EngineerInternKth Employee Reached in an Ordered Hierarchy
Kth Employee Reached in an Ordered Hierarchy Implement kth_recipients(boss, queries). Employees are numbered 0 through n - 1. boss[0] == -1; for every...
Coding & Algorithms
11
0
155 people solved
Jul 3, 2026
Medium
Software EngineerInternMinimum Delivery Cost Between Cities
Minimum Delivery Cost Between Cities Implement minimum_delivery_costs(delivery_charges, queries). There are n cities indexed from 0 to n - 1, and city...
Coding & Algorithms
15
1
125 people solved
Jul 3, 2026
Easy
Software EngineerInternCheck Root-To-Leaf Target Sums In A Binary Tree
You are given the root of a binary tree and an integer target. Each node contains an integer value. Return true if there is at least one path from the...
Coding & Algorithms
0
0
8 people solved
Jul 3, 2026
Medium
Data ScientistCompute credit-card portfolio profit and breakeven
A bank is evaluating a new credit card. Segments: A: 30,000 customers, capture rate 20%, avg annual spend per captured customer = $100,000. B: any pop...
Statistics & Math
15
0
183 people solved
Oct 13, 2025
Medium
Data ScientistDiagnose a metric drop in search time
Over the last 3 calendar months, the metric 'searching time per user per session' dropped by 35%. A teammate proposes modeling two distributions: T1 =...
Analytics & Experimentation
6
1
90 people solved
Oct 13, 2025
Hard
Data ScientistDesign and analyze a switchback experiment
Design and Analyze a Switchback Experiment: Reducing Cold-Food Incidents for Bike Couriers You are a data scientist on a delivery-marketplace team. A ...
Analytics & Experimentation
59
0
401 people solved
Oct 13, 2025
Hard
Data ScientistDesign a robust fraud detection system
Real-Time Card Fraud Detector — End-to-End Design Context - Fraud base rate ≈ 0.2% (severe class imbalance) - Labels arrive with a 14-day delay (e.g.,...
Machine Learning
20
0
305 people solved
Oct 13, 2025
Hard
Data ScientistDesign and diagnose a regression pipeline
CLV_90 Prediction Pipeline under Zero-Inflation, Heavy Tails, and Multicollinearity Context You need to predict 90-day customer value (CLV_90) at the ...
Machine Learning
55
0
401 people solved
Oct 13, 2025
Hard
Data ScientistDesign a leak-free time-split model
Predict 30-Day Purchase Probability at a Snapshot (Technical Screen) Assume you have user, event, and order data with two timestamps per row: - event_...
Machine Learning
4
0
61 people solved
Oct 13, 2025
Hard
Data ScientistDesign and evaluate an A/B test for launch
A/B Test Design: New Matching Model for a Two‑Sided Marketplace Context You are testing a new matching/ranking model that determines which providers a...
Analytics & Experimentation
7
0
66 people solved
Oct 13, 2025
Hard
Data ScientistImplement CUDA-tiled matrix multiplication and explain architecture
CUDA FP32 GEMM Design Task Implement a high-performance CUDA kernel for matrix multiplication C = A · B where: - A is m×k, B is k×n, C is m×n - Data t...
Coding & Algorithms
15
0
110 people solved
Oct 13, 2025
Medium
Backend Engineer LockedDesign a high-throughput ad exchange
This question evaluates a candidate's ability to design scalable, high-throughput, low-latency distributed backend systems for real-time ad exchanges,...
System Design
4
0
80 people solved
Feb 25, 2026
Hard
Software EngineerNew Grad LockedExplain thermal and signal fundamentals
This question evaluates understanding of hardware fundamentals including thermal-resistance modeling, digital signal biasing (pull-up resistor selecti...
Software Engineering Fundamentals
6
0
75 people solved
Feb 25, 2026
Medium
Machine Learning EngineerNew GradDesign a multimodal RAG assistant
Prompt Design a Retrieval-Augmented Generation (RAG) system that can answer user questions using an internal knowledge base containing multiple modali...
System Design
18
0
178 people solved
Dec 15, 2025
Hard
Software EngineerDetect recurring transactions from a ledger
You are given a list of credit/debit card transactions. Each transaction has: - transaction_date (YYYY-MM-DD) - merchant (string) - amount (decimal, p...
Coding & Algorithms
43
0
505 people solved
Dec 15, 2025
Medium
Machine Learning EngineerReturn all root-to-leaf tree paths
Given the root of a binary tree, return all root-to-leaf paths. - A leaf is a node with no children. - A path should be represented as a string with n...
Coding & Algorithms
11
0
88 people solved
Dec 15, 2025
Medium
Software EngineerFind a secret word via match feedback
Word Guessing Game (Mastermind-style) You are given a list of unique candidate words wordlist. All words have the same length L and contain only lower...
Coding & Algorithms
9
0
186 people solved
Dec 15, 2025
Medium
Machine Learning EngineerSolve linked list, tree, and grid problems
Problem A — Find cycle entry in a singly linked list You are given the head of a singly linked list. The list may contain a cycle. - Return the node w...
Coding & Algorithms
16
0
112 people solved
Dec 15, 2025
Hard
Software EngineerImplement credit ledger with out-of-order timestamps
Problem You are implementing a GPU credit ledger that supports adding credits, charging credits, and querying balances. Requests can arrive in any tim...
Coding & Algorithms
142
1
957 people solved
Dec 15, 2025