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 EngineerInternDesign an Event-Driven CPU Overheat Controller
Design an Event-Driven CPU Overheat Controller Design an OverheatPreventionController that simulates multiple processor cores without physical sensors...
Software Engineering Fundamentals
242
0
2254 people solved
Jul 2, 2026
Easy
Software EngineerDesign a Concurrent Restaurant Waitlist and Seating System
Design a Concurrent Restaurant Waitlist and Seating System Design a restaurant system with a configurable set of tables and a FIFO waitlist of parties...
Software Engineering Fundamentals
166
0
1474 people solved
Jul 7, 2026
Medium
Software EngineerDesign First-Fit and Best-Fit Memory Allocation
Design the core of a heap allocator over one contiguous managed region. Blocks have an address, size, and free/allocated state. Allocation requests sp...
Software Engineering Fundamentals
53
1
358 people solved
Jul 27, 2026
Medium
Software Engineer AIDebug Watch List Movie Operations
You are given a full-stack Movie DB application. Users can log in, create, update, and delete watch lists, and add or remove movies from a watch list....
Software Engineering Fundamentals
778
3
8166 people solved
Jun 12, 2026
Medium
Software EngineerDesign an Alert Notification Service for Downstream Consumers
Design an Alert Notification Service for Downstream Consumers Design an alert-notification system whose recipients are downstream services rather than...
System Design
21
0
161 people solved
Aug 4, 2026
Hard
Software EngineerMerge Exact-Word Highlights and Rank Their Citations
Highlight Exact Source Phrases and Attach Citations You are given a text string and an indexed list of source phrases. All input tokens are alphanumer...
Coding & Algorithms
45
0
374 people solved
Jul 27, 2026
Hard
Software EngineerOptimal Stopping with Square-Number Ruin
Optimal Stopping with Square-Number Ruin You repeatedly roll a fair six-sided die and add each roll to a running total. Before each roll, you may stop...
Statistics & Math
19
0
175 people solved
Aug 3, 2026
Hard
Software EngineerDesign a Large-Scale Streaming AI Product Feature
Design a Large-Scale Streaming AI Product Feature Design a product-facing AI feature for many concurrent users with streamed responses. Cover API and ...
System Design
10
0
75 people solved
Aug 11, 2026
Hard
Software EngineerImplement a Set with Readable Snapshots
Implement a set that supports add(value), remove(value), contains(value), snapshot(), and containsAt(snapshot_id, value). Creating a snapshot returns ...
Software Engineering Fundamentals
9
0
86 people solved
Aug 10, 2026
Easy
Machine Learning EngineerDesign an Embedding and Classification API
Design an Embedding and Classification API Design a service that accepts text items, generates vector embeddings, and optionally classifies each item ...
ML System Design
18
0
209 people solved
Jul 27, 2026
Medium
Software EngineerDeduplicate and Order Batch and Streaming Logs
Deduplicate and Order Batch and Streaming Logs A log is (timestamp, message), where timestamp is an integer and message is compared exactly. Input ord...
Coding & Algorithms
72
1
480 people solved
Jul 14, 2026
Medium
Software EngineerDesign a News Aggregation System (Google News-style)
Design a large-scale news aggregation service similar to Google News. The system continuously discovers and crawls news articles from tens of thousand...
System Design
262
1
2907 people solved
Jun 30, 2026
Hard
Software EngineerDesign Comment Notifications with Viral-Pin Aggregation
Design Comment Notifications with Viral-Pin Aggregation Design a system that sends a push notification to a pin owner when someone comments on the pin...
System Design
9
0
85 people solved
Aug 7, 2026
Medium
Data ScientistDiagnose Why Delivered Food Arrives Cold
Diagnose Why Delivered Food Arrives Cold A delivery marketplace is receiving reports that food arrives cold. Describe how you would determine where th...
Analytics & Experimentation
35
0
450 people solved
Jul 19, 2026
Medium
Software EngineerDesign a Payment Lifecycle from Hold to Charge and Settlement
Design a Payment Lifecycle from Hold to Charge and Settlement Design a payment system whose main lifecycle is hold, charge, then settlement. A hold re...
System Design
13
0
116 people solved
Aug 1, 2026
Hard
Software EngineerDesign a Concurrent Image Processing Service
Design a Concurrent Image Processing Service Design an image-processing service in two stages. First, support one processor safely. Then scale to mult...
System Design
102
0
696 people solved
Jul 8, 2026
Hard
Software EngineerDesign Snapshot Set Iteration and Clarify Durable Writes
Work through a snapshot-set iterator and then explain how you would clarify a separate durable-writer exercise whose detailed contract has not been pr...
Software Engineering Fundamentals
18
0
187 people solved
Jul 26, 2026
Medium
Software EngineerMake a Courier Pay Workflow Resilient to Downstream Failures
Make a Courier Pay Workflow Resilient to Downstream Failures A coding exercise has produced a simplified courier-pay calculator. The calculation rules...
Software Engineering Fundamentals
12
0
83 people solved
Aug 4, 2026
Medium
Software EngineerDesign an Embeddable Pay by Bank Widget
Design an Embeddable Pay by Bank Widget Design a Pay by Bank widget that online businesses can embed in checkout or bill-payment pages. The widget's i...
System Design
14
0
96 people solved
Aug 1, 2026
Medium
Software EngineerDesign a Distributed Frequency-Capping Service
Design a frequency-capping service for an advertising platform. Before an ad impression is served, the caller asks whether a user has already seen a c...
System Design
3
0
47 people solved
Aug 11, 2026