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
iOS EngineerSenior+Implement A Mobile Chat Interface In An Existing Codebase
You are given an existing mobile codebase and asked to implement a ChatGPT-style chat screen in about 40 minutes. Describe how you would read the proj...
Software Engineering Fundamentals
9
0
69 people solved
Jul 3, 2026
Medium
Software EngineerInternDesign alerting for application-to-exchange mappings
Problem: Alerting design for application→exchange mappings You are building a service that receives an ordered stream of mapping events: - register(ap...
System Design
30
0
548 people solved
Feb 11, 2026
Medium
Software EngineerDesign Installment-Loan Payment Processing
Design Installment-Loan Payment Processing Design a payment-processing system for an existing user's active installment loan. A payment may be initiat...
System Design
11
0
91 people solved
Apr 19, 2026
Medium
Software EngineerSenior+ LockedDemonstrate Senior Engineering Judgment
Prepare concise behavioral stories that demonstrate senior engineering judgment through difficult projects, competing priorities, disagreement, influe...
Behavioral & Leadership
7
0
66 people solved
Jun 12, 2026
Easy
Data AnalystShould a Restaurant Partner with Groupon?
A restaurant is deciding whether to partner with a daily-deals platform such as Groupon. You are asked to work through the unit economics and make a r...
Analytics & Experimentation
84
0
793 people solved
Jan 21, 2026
Medium
Software EngineerQuery an Indexed In-Memory Numeric Table
Query an Indexed In-Memory Numeric Table Problem Implement queryIndexedRows(rows, queries) -> answers for one immutable in-memory table containing onl...
Coding & Algorithms
0
0
5 people solved
Jul 27, 2026
Medium
Software EngineerModel Flights, Passengers, Bookings, and Seat Holds
Design a relational data model for a flight-booking service that must support these operations efficiently: - Book a passenger on a flight. - Retrieve...
System Design
1
0
19 people solved
Jul 12, 2026
Medium
Software EngineerDesign a Population-Weighted Random Country Picker
Design a Population-Weighted Random Country Picker Design a class initialized with country names and positive population weights. Each call to pick() ...
Software Engineering Fundamentals
4
0
55 people solved
Jul 2, 2026
Easy
Software EngineerDesign Stack Evaluators and Low-Latency Memory Primitives
Work through the following systems-programming exercises. State the memory and concurrency model you assume before writing pseudocode. Part 1: Stack M...
Software Engineering Fundamentals
4
0
30 people solved
Jun 14, 2026
Medium
Software Engineer LockedDesign a Distributed Rate Limiter
This question evaluates expertise in distributed systems and real-time rate-limiting, covering scalability, low-latency design, concurrency control, c...
System Design
33
0
235 people solved
May 14, 2026
Medium
Software Engineer LockedFind and Count Maximum-Score Grid Paths
Find the maximum-scoring path from a fixed top-row cell to the last row of a grid using diagonal, downward, and limited two-row jump moves. Return the...
Coding & Algorithms
4
0
42 people solved
Jun 11, 2026
Medium
Software Engineer LockedDesign a To-Do List Service (CRUD, Auth, Rate Limiting, Caching & API Versioning)
This system design question evaluates practical full-stack architectural thinking across REST API design, authentication, rate limiting, and caching i...
System Design
11
0
156 people solved
Jun 11, 2026
Medium
Software EngineerDesign a Cron Job Scheduler
Design a distributed cron job scheduler — a service that triggers user-defined jobs on recurring, cron-style schedules. Assume worker (execution) capa...
System Design
72
0
704 people solved
Apr 12, 2026
Medium
Backend EngineerSenior+ LockedDesign a Distributed File System
This question evaluates design skills for large-scale distributed storage systems, testing understanding of distributed systems principles such as met...
System Design
53
0
412 people solved
May 4, 2026
Medium
Data ScientistAnalyze User Ride Activity with SQL
Use the following tables to answer four SQL analysis tasks. `text rides(ride_id, ride_date, ride_rating, user_id) users(user_id, city) ` Constraints &...
Data Manipulation (SQL/Python)
10
3
115 people solved
Mar 14, 2026
Hard
Software EngineerCompute Statistics from a Frequency Array
Compute Statistics from a Frequency Array You receive an array freq of length 256. freq[v] is the number of times integer value v occurs in an implici...
Statistics & Math
12
0
124 people solved
Mar 29, 2026
Hard
Machine Learning Engineer LockedGRPO Deep Dive: Critic-Free RL, Parallelism, MLA, and Reward Design for a Reasoning LLM
This question assesses understanding of reinforcement learning algorithms used to post-train large reasoning language models, including critic-free po...
Machine Learning
9
0
101 people solved
Jun 21, 2026
Medium
Software EngineerDesign a Scheduler for ML Training and Batch Inference Jobs
Design a Scheduler for ML Training and Batch Inference Jobs Design a scheduler for machine-learning compute jobs. Focus on training and batch inferenc...
System Design
1
0
15 people solved
Jun 24, 2026
Hard
Software EngineerCalculate the Probability That Two Dice Sum to Seven
Roll two independent fair six-sided dice. What is the probability that their sum is 7? Show the sample space and favorable outcomes. Then explain why ...
Statistics & Math
2
0
26 people solved
May 24, 2026
Hard
Software EngineerDesign a Priority Task Executor with Duplicate Task IDs
Design a Priority Task Executor with Duplicate Task IDs Design an in-memory component with two operations: - addTask(taskId, priority, timestamp) reco...
Software Engineering Fundamentals
2
0
20 people solved
Jun 9, 2026