Interview Questions
Practice the exact questions companies are asking right now.
Questions
9.8k
Companies
520
Updated
08.21.2026
9.8k 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
Machine Learning EngineerFind Earliest Train Route
You are given a discrete train timetable and need to find a valid route through the train network. Each train has an itinerary represented as a sequen...
Coding & Algorithms
3
0
38 people solved
Apr 23, 2026
Medium
Software EngineerDesign Event Email System
Design Event Email System Design an event system that can manage at least 1,000,000 concurrent events and send notification emails to every registered...
System Design
44
0
373 people solved
Aug 4, 2025
Medium
Software EngineerSenior+Design a Relational-to-DynamoDB Migration System
Design a production migration system that moves an existing e-commerce service from a relational database to DynamoDB with minimal downtime. Your desi...
System Design
14
0
133 people solved
Apr 8, 2026
Medium
Software Engineer LockedIn-Memory URL Shortener: Encode and Decode
This question evaluates a candidate's ability to design a class-based data structure with paired encode and decode operations that maintain a consiste...
Coding & Algorithms
0
0
9 people solved
Jun 12, 2026
Medium
Data ScientistHow detect duplicate card records?
You are given a dataset of credit card transaction records and suspect that some records are duplicates. Discuss: - What real-world situations could c...
Machine Learning
4
0
91 people solved
Feb 26, 2026
Hard
Software Engineer LockedDesign a Hotel Booking System
This question evaluates system design and backend architecture competencies, including data modeling, transactional integrity, concurrency control, sc...
System Design
39
0
369 people solved
Feb 1, 2026
Medium
Software EngineerRestore an Array with One Displaced Element
Restore an Array with One Displaced Element An integer array was originally sorted in nondecreasing order. It was then changed by removing at most one...
Coding & Algorithms
3
0
30 people solved
Jul 2, 2026
Medium
Backend EngineerSenior+Handle Competing Requests from Colleagues
Handle Competing Requests from Colleagues Tell me about a time a colleague asked you to take on work that was outside your current plan or competed wi...
Behavioral & Leadership
1
0
15 people solved
Jul 2, 2026
Medium
Software Engineer4.1 Design a Live Streaming Platform
This is a classic system design question that tests your ability to handle real-time data at massive scale. Live streaming sits at the intersection of...
System Design
13
0
130 people solved
Jan 31, 2026
Easy
Data ScientistHow would you critique this regression?
Question You are reviewing a modeling workflow built by another data scientist and asked to critique it. Business context A website receives traffic f...
Statistics & Math
34
0
254 people solved
Jan 8, 2026
Hard
Software EngineerDesign IDE Sandbox and Payments
You are asked to discuss two system design prompts. For each one, define the users, functional requirements, non-functional requirements, APIs, core w...
System Design
9
0
88 people solved
Apr 7, 2026
Medium
Software Engineer LockedDesign an Online Coding Contest Platform
This question evaluates a candidate's ability to design a scalable, secure System Design for an online coding contest platform with emphasis on safely...
System Design
8
0
95 people solved
Apr 7, 2026
Hard
Software EngineerSenior+Explain OOP design and API rollout
In one interview round, the discussion focused on practical backend engineering rather than pure algorithms. Discuss both of the following: 1. You are...
Software Engineering Fundamentals
8
0
119 people solved
Apr 7, 2026
Hard
Software EngineerMaximize Distinct Values with Cross-Array Swaps
Maximize Distinct Values with Cross-Array Swaps Given arrays a and b of equal length and an integer k, perform at most k swaps. Each swap chooses one ...
Coding & Algorithms
0
0
4 people solved
May 24, 2026
Hard
Software EngineerDesign a Google News-like aggregator
Design a Google News–like News Aggregation Platform Design a multi-region news aggregation platform (in the spirit of Google News) that ingests conten...
System Design
44
0
321 people solved
Sep 6, 2025
Hard
Software EngineerDesign a trending-articles platform
Design a Near Real-Time Trending-Articles Platform Design the backend that surfaces trending articles in near real time for a large-scale consumer pro...
System Design
30
0
366 people solved
Sep 6, 2025
Medium
Software Engineer LockedDesign a superhero incident dispatch system
This question evaluates system design and distributed systems competencies, including geospatial indexing, real-time location ingestion, low-latency m...
System Design
16
0
189 people solved
Feb 12, 2026
Easy
Machine Learning Engineer LockedExplain LLM post-training methods and tradeoffs
This question evaluates a practitioner's knowledge of LLM post-training methods—including supervised fine-tuning, preference optimization approaches (...
Machine Learning
38
0
367 people solved
Feb 12, 2026
Medium
Data ScientistSenior+How do you diagnose a ratio metric change
In an A/B test, the treatment group shows a statistically significant increase in a ratio metric: - CTR = clicks / impressions increased by +1.2% rela...
Analytics & Experimentation
27
0
214 people solved
Nov 24, 2025
Medium
Software Engineer LockedChoose optimal guesses for green-only Wordle
This question evaluates probabilistic reasoning, expected-value optimization, information partitioning, and algorithmic efficiency in selecting guesse...
Coding & Algorithms
10
1
119 people solved
Oct 14, 2025