Tech Interview Questions

Practice the exact questions companies are asking right now.

Questions

18.6k

Companies

980

Updated

11.12.2026

18.6k Questions 980 Companies11.12.2026

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

Stripe

Medium

Machine Learning Engineer

Group Accounts Linked Directly or Transitively by Shared Metadata Fields

A platform stores many accounts, and each account carries the same fixed list of metadata fields, such as a name, an email address and a phone number....

Coding & AlgorithmsGraphs

Software EngineerNew Grad

Choose an Offset for Compressing Clustered Integers with Outliers

Most integers in a dataset are concentrated in a narrow range, with a few outliers. Choose an offset that reduces storage, and explain how a sliding w...

Software Engineering FundamentalsTwo Pointers & Sliding WindowSorting

First and Last Indices of a Value

Problem You receive an integer array values in non-decreasing order and an integer key. Return a two-element array containing the zero-based indices o...

Coding & AlgorithmsBinary Search

51 people solved

ByteDance

Medium

Software EngineerNew Grad

Shortest One-Letter-at-a-Time Transformation Between Two Words

You are given two words, begin_word and end_word, and a list of words word_list. All of the words have the same length and consist of lowercase Englis...

Coding & AlgorithmsGraphs

Software EngineerSenior+

Design a real-time multiplayer typing race game

Design a real-time multiplayer typing game. The report describes it as a variant of the common "design online chess" question. In its usual form, play...

System DesignMultiplayer Game SystemsReal-Time Systems

Design Durable One-to-One Web Messaging at Large Scale

Design a one-to-one text messaging application with Web clients and 100 million daily active users. Group chats, images, video, and mobile push notifi...

System DesignReal-Time SystemsDistributed Transactions & Idempotency

253 people solved

Sep 1, 2026

GoogleMicrosoftAmazon

Medium

Software Engineer

Enumerate Telephone-Keypad Letter Choices

Problem The string keys contains telephone-keypad digits. Return every letter string obtained by choosing one mapped letter for each digit, preserving...

Coding & AlgorithmsBacktracking & Recursion

Design a Shopping Cart Service That Keeps Inventory Consistent Under Concurrency

Design the backend that manages shopping carts for an online store: shoppers add items, change quantities, remove items, view their cart and check out...

System DesignTransactions & IsolationDistributed Transactions & Idempotency

Machine Learning Engineer

Eight Behavioral Questions: Root Cause, Missed Commitment, Disagreement, Hard Feedback

In the behavioral part of an interview loop, right after a project deep dive, the interviewer asked the eight questions below. Prepare an answer to ea...

Behavioral & LeadershipConflict & CollaborationFailure & Learning

Design a Credit Card System: Authorization, Fraud, Bureau Reports, Limit Increases

Design the back end of a credit card system for a card issuer. The system must support: 1. Login. Customers sign in to the issuer's website and mobile...

System DesignPayments & LedgersSystem Design Fundamentals

Machine Learning Engineer

Rectangle grid with IDs: coverage counts, replace and delete, O(1) queries, batch undo

Implement a class that maintains a two-dimensional grid of cells onto which rectangles are placed, each rectangle with its own ID. The requirements ar...

Software Engineering FundamentalsData Structure Design

Design a product likes system for a marketplace of brands and retailers

Design the backend for product likes on a marketplace where brands list products and retailers browse them. The system must support four features: 1. ...

System DesignSystem Design FundamentalsAPI Design

Software Engineer Locked

Three-Card Game: Deal Hands, Rank Them, Then Add a Flush Category

A two-part card game coding exercise: deal three cards to each player from one deck, show every hand and pick the winner using three of a kind, pair a...

Software Engineering FundamentalsLow-Level Design (OOP)Testing & Quality

MNIST Loss Bounds per Example and an Adaptive Calibration Error (ACE) Implementation

An interview for a research scientist role included a machine-learning round built around a classifier for the MNIST handwritten-digit dataset, which ...

Machine LearningModel EvaluationML Coding

Design an Image Feed: Uploads, Image Delivery, and Feed Generation

Design an image feed. Users upload images to share as posts, and each user scrolls a feed of other users' images. The feed must load quickly and scrol...

System DesignSearch & Feed SystemsFile & Media Storage

Fewest Coins for an Amount with Unlimited or Single-Use Coins

You are given coin values coins and a target amount. Return the fewest coins whose values add up to exactly amount, or -1 if no selection of coins doe...

Coding & AlgorithmsDynamic Programming

Resource Reconciler: Plan CREATE Changes, Then Create Resources and Save Bindings

Implement the core of a resource reconciler: a component that compares the resources you want with the resources that actually exist, works out the ch...

Software Engineering FundamentalsLow-Level Design (OOP)Distributed Transactions & Idempotency

Machine Learning Engineer

Design a Video Recommender with Two-Tower Retrieval and MMoE Ranking

Design a video recommendation system, including log-to-feature and label flow, two-tower retrieval updates, serving, and offline evaluation. Explain h...

Machine LearningRecommendation SystemsML System Design

Quantitative Researcher

Compute the Probability of Consecutive Heads in n Tosses

Find the probability that a sequence of n independent fair coin tosses contains at least one consecutive HH pair. Derive a recurrence and explain the ...

Statistics & MathProbabilityDynamic Programming

Validate Chess Moves: Bishop Diagonals, Blocked Paths and Shared Sliding Rules

You are building the backend of a two-player chess game, and the backend must accept only legal moves. Rather than the full game framework, the interv...

Software Engineering FundamentalsSimulation & State MachinesLow-Level Design (OOP)

13 people solved

Nov 9, 2026

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Tech Interview Questions

Group Accounts Linked Directly or Transitively by Shared Metadata Fields

Choose an Offset for Compressing Clustered Integers with Outliers

First and Last Indices of a Value

Shortest One-Letter-at-a-Time Transformation Between Two Words

Design a real-time multiplayer typing race game

Design Durable One-to-One Web Messaging at Large Scale

Enumerate Telephone-Keypad Letter Choices

Design a Shopping Cart Service That Keeps Inventory Consistent Under Concurrency

Eight Behavioral Questions: Root Cause, Missed Commitment, Disagreement, Hard Feedback

Design a Credit Card System: Authorization, Fraud, Bureau Reports, Limit Increases

Rectangle grid with IDs: coverage counts, replace and delete, O(1) queries, batch undo

Design a product likes system for a marketplace of brands and retailers

Three-Card Game: Deal Hands, Rank Them, Then Add a Flush Category

MNIST Loss Bounds per Example and an Adaptive Calibration Error (ACE) Implementation

Design an Image Feed: Uploads, Image Delivery, and Feed Generation

Fewest Coins for an Amount with Unlimited or Single-Use Coins

Resource Reconciler: Plan CREATE Changes, Then Create Resources and Save Bindings

Design a Video Recommender with Two-Tower Retrieval and MMoE Ranking

Compute the Probability of Consecutive Heads in n Tosses

Validate Chess Moves: Bishop Diagonals, Blocked Paths and Shared Sliding Rules

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