Tech Interview Questions

Practice the exact questions companies are asking right now.

Questions

12.1k

Companies

579

Updated

10.10.2026

12.1k Questions 579 Companies10.10.2026

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."

PLTCHK

_The_TaNk_

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

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

Simulate Monster Team Battles

This question evaluates a candidate's ability to model stateful simulations and implement deterministic battle mechanics with clean data structures an...

Explain median vs mean for L1/L2

Median vs. Mean Under L1 and L2 Loss, and the 2D Extension Explain, with intuition and a brief derivation, the relationship between the choice of loss...

Statistics & MathSampling & Estimation

Control confounding in observational ad lift

Estimating the ATE of Ad Exposure on Conversions (Observational Setup) You cannot randomize ad exposure. Users differ in age, education, income, and o...

Statistics & Math

70 people solved

Oct 13, 2025

Design a ticketing purchase system

System Design: High-Concurrency Ticket Purchasing With Seat Maps You are asked to design an end-to-end ticketing system for large on-sale events (e.g....

Sketch function from derivatives and limits

Function analysis with derivative and concavity constraints Context (clarified): Assume f: R → R is differentiable everywhere and twice differentiable...

Software EngineerSenior+

Find the First Unique IP

You are processing a chronological stream of server hit records. Each record contains an IP address as a string. Design and implement a component that...

Coding & AlgorithmsData Structure Design

Machine Learning Engineer

Debug MNIST denoiser training

Debug MNIST denoiser training Debugging a Colab Denoising Network on MNIST Goal: Make a Colab notebook that trains a denoising neural network on MNIST...

ML System DesignML CodingNeural Networks & Training

Explain and validate A/B test assumptions

A/B Test Validity: Core Assumptions, Violations, Diagnostics, and Mitigations You are designing and evaluating an online A/B test for a large, multi-s...

Analytics & ExperimentationExperiment Design (A/B Testing)Hypothesis Testing

Software EngineerSenior+ Locked

Design an Online Minesweeper Platform

This question evaluates competency in designing scalable, low-latency, real-time stateful systems, covering data modeling, API design, persistence, co...

Find longest common ordered restaurant list

You have two delivery drivers who each have a pickup plan represented as a list of restaurant IDs (strings). Because there is only one car, the combin...

Coding & AlgorithmsDynamic Programming

Prepare Behavioral Stories for Stakeholders, Mistakes, and Ownership

Prepare behavioral stories for stakeholders, simplifying systems, mistakes, learning new technology, disagreement, and ownership. `hint Hint 1 Start b...

Behavioral & Leadership

Interpret regression metrics and assumptions

A multiple linear regression is fit to predict arrival delay with standardized numeric predictors and one‑hot categorical variables. Without seeing th...

Software Engineer Locked

Calculate Trapped Rain Water

Calculate how much rain water is trapped between nonnegative unit-width bars without mutating the input. A two-pointer scan tracks the highest boundar...

Explore Dataset to Assess Quality and Choose Visualizations

Understanding a New Dataset: Profiling, Quality, and Visualization You receive a new, unfamiliar dataset and must quickly generate insights and visual...

Analytics & Experimentation

Verify Machine-Learning Fundamentals for E-commerce Recommendation Platform

Verify Machine-Learning Fundamentals for E-commerce Recommendation Platform Rapid ML Fundamentals Check — Recommender Systems Context You are intervie...

Compute 7-Day Rolling Average of Unique Post Viewers

POST_VIEWS +---------+------------+---------+ | user_id | view_date | post_id | | 101 | 2023-08-01 | 10 | | 102 | 2023-08-01 | 11 |...

Data Manipulation (SQL/Python)

Machine Learning Engineer

Design a chunking strategy for RAG

You are building a Retrieval-Augmented Generation (RAG) system that uses an LLM plus a vector database. Before creating embeddings and indexing docume...

ML System Design

102 people solved

Sep 24, 2025

Identify Probability of Request Originating from Bad User

Identify Probability of Request Originating from Bad User Measuring Abuse in Friend-Requests: Bayes, Identification, and Precision Scenario A social-n...

Design a scalable inventory system

Design a scalable inventory system System Design: Multi-Warehouse, Multi-Channel Inventory Service You are designing an inventory service for an e-com...

System DesignSystem Design FundamentalsAPI Design

Find minimum time for irrecoverable password

A password is a string s of length n. A virus attacks positions in a 1-indexed order given by a permutation attackOrder[1..n]. At second t (1 <= t <= ...

Coding & Algorithms

38 people solved

Sep 6, 2025

Tech Interview Questions

Simulate Monster Team Battles

Explain median vs mean for L1/L2

Control confounding in observational ad lift

Design a ticketing purchase system

Sketch function from derivatives and limits

Find the First Unique IP

Debug MNIST denoiser training

Explain and validate A/B test assumptions

Design an Online Minesweeper Platform

Find longest common ordered restaurant list

Prepare Behavioral Stories for Stakeholders, Mistakes, and Ownership

Interpret regression metrics and assumptions

Calculate Trapped Rain Water

Explore Dataset to Assess Quality and Choose Visualizations

Verify Machine-Learning Fundamentals for E-commerce Recommendation Platform

Compute 7-Day Rolling Average of Unique Post Viewers

Design a chunking strategy for RAG

Identify Probability of Request Originating from Bad User

Design a scalable inventory system

Find minimum time for irrecoverable password

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