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

Upstart

Medium

Applied Scientist

Expected Total Backward Steps When Called Guests Move to the Front of a Random Line

One hundred guests, numbered 1 to 100, stand in a single line to enter a party, in a uniformly random order. The host calls the numbers one at a time....

Statistics & MathProbabilityPuzzles & Brainteasers

Probability Limited Stock Covers Every Customer in a Queue

A queue of $N$ customers is waiting in a store. Each customer will buy exactly one item: product A with probability $p$, or product B with probability...

Statistics & MathProbability

Simulate a fixed-capacity least-recently-used cache over get and put operations

Design a cache with a fixed capacity that evicts the least recently used key when it is full. To make it testable as one function, you receive the cap...

Coding & AlgorithmsData Structure DesignLinked Lists

48 people solved

Oct 4, 2026

Medium

Software Engineer Locked

Generate All Distinct Permutations of a List with Duplicate Values

Given a list of up to eight integers that may contain duplicates, return every distinct permutation exactly once, sorted in lexicographic order. It te...

Coding & AlgorithmsBacktracking & Recursion

Design a Product Catalog Ingested From Full Retailer Snapshots With Admin Overrides

Design a product catalog system. Retailers send their catalogs to the platform as snapshot files, users browse the resulting catalog, and platform adm...

System DesignSystem Design FundamentalsETL & Data Pipelines

Design an Order Fulfillment System

Design an Order Fulfillment System Design the backend flow that takes an accepted customer order through inventory reservation, payment, warehouse pro...

Design automatic travel insurance enrollment triggered by customer location

Design the backend for a mobile banking app feature that enrolls customers in travel insurance automatically, based on where they are. A customer opts...

System DesignMessaging & Event-DrivenDistributed Transactions & Idempotency

Reorder the Original Array into Strict Alternating Peaks

Problem Rearrange nums in place so nums[0]<nums[1]>nums[2]<nums[3] and so on. The source guarantees a valid rearrangement exists and accepts different...

Coding & AlgorithmsSortingArrays & Strings

19 people solved

GoogleMicrosoftAmazon

Easy

Software Engineer

List Email Spellings That Occur More Than Once

Problem List every duplicate email from Person once, under the output label Email. The email field is guaranteed non-NULL and contains no uppercase le...

Data Manipulation (SQL/Python)SQLData Cleaning & Wrangling

Design a Spam Review Workflow with Classifiers, AI Agents, and Human Labelers

Design a Spam Review Workflow with Classifiers, AI Agents, and Human Labelers Design a spam detection system that combines a classifier, an AI agent, ...

ML System DesignAI AgentsAnnotation & Label Quality

78 people solved

Sep 9, 2026

Design a Large-Scale Personalized Recommendation System End to End

Design a recommendation system end to end. When a user opens a product surface, the system picks a small, ordered set of items to show out of a very l...

ML System DesignRecommendation SystemsRanking Models

Maximize Nonoverlapping Trades under a Transaction Cap

Problem Given chronological prices and an integer k, return the maximum profit from at most k buy/sell transactions. Hold at most one share at a time:...

Coding & AlgorithmsDynamic Programming

String Left Before the Final Round of Removing Each Letter's First Occurrence

You are given a string s of lowercase English letters. One round of the following operation is applied to it again and again until the string becomes ...

Coding & AlgorithmsArrays & Strings

5 people solved

Nov 5, 2026

Design a Notification System That Delivers Events to Users at Scale

Design the notification system for a large social platform. Many product services, such as comments, reactions, friend requests, messages, and event r...

System DesignReal-Time SystemsMessaging & Event-Driven

Allocate Work Between an E3 Engineer and an Intern

You are responsible for guiding an E3 engineer and an intern. How would you divide work, provide support, and help both contribute and grow? Constrain...

Behavioral & LeadershipMentoring & Team GrowthLeadership & Influence

Software Engineer Locked

Compute Load Factors in a Service Dependency DAG

Compute exact service load factors as one entry request propagates through a dependency DAG and converging paths accumulate. The question defines unre...

Software Engineer Locked

Merge Two Strings Using the Longest Edge Overlap

Compare both suffix-to-prefix concatenation orders, merge the longest edge overlap, and favor the original string order when overlap lengths tie.

Coding & AlgorithmsString Algorithms

Evaluating a Production LLM: Quality Dimensions, Offline Evals and Live Monitoring

In a product manager interview, you are asked to walk through how you have evaluated the quality and performance of a large language model (LLM) runni...

Machine LearningAI Product ManagementLLM Evaluation

Software Engineer Locked

IPv4 CIDR Range Membership Queries

This question evaluates a candidate's ability to design an efficient longest-prefix-match lookup structure for IP address ranges, a core networking an...

Software Engineer Locked

Design an LLM Inference Serving System

Design production inference serving for one or more large language models from admission through streamed token generation. Explore model lifecycle, a...

ML System DesignLLM Inference & ServingGPU Infrastructure

319 people solved

Jul 26, 2026

Visa Tools

Visa Sponsors

H-1B Odds Calculator

Visa Bulletin

Tech Interview Questions

Expected Total Backward Steps When Called Guests Move to the Front of a Random Line

Probability Limited Stock Covers Every Customer in a Queue

Simulate a fixed-capacity least-recently-used cache over get and put operations

Generate All Distinct Permutations of a List with Duplicate Values

Design a Product Catalog Ingested From Full Retailer Snapshots With Admin Overrides

Design an Order Fulfillment System

Design automatic travel insurance enrollment triggered by customer location

Reorder the Original Array into Strict Alternating Peaks

List Email Spellings That Occur More Than Once

Design a Spam Review Workflow with Classifiers, AI Agents, and Human Labelers

Design a Large-Scale Personalized Recommendation System End to End

Maximize Nonoverlapping Trades under a Transaction Cap

String Left Before the Final Round of Removing Each Letter's First Occurrence

Design a Notification System That Delivers Events to Users at Scale

Allocate Work Between an E3 Engineer and an Intern

Compute Load Factors in a Service Dependency DAG

Merge Two Strings Using the Longest Edge Overlap

Evaluating a Production LLM: Quality Dimensions, Offline Evals and Live Monitoring

IPv4 CIDR Range Membership Queries

Design an LLM Inference Serving System

Choose your next challenge

Blind 75

ML System Design

System Design Interview