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

AmazonGoogleBloomberg

Easy

Software Engineer

Return the Floor of a Square Root

Problem For the nonnegative integer value, return its square root rounded downward to an integer. The result must also be nonnegative. You must not us...

Coding & AlgorithmsMath & Number TheoryBinary Search

13 people solved

InfosysSalesforceAmazon

Easy

Software Engineer

Maximum Number of Balanced L/R Pieces

Problem The string s has equally many L and R characters. Partition the entire string into nonempty contiguous pieces, each also containing equal coun...

Coding & AlgorithmsGreedyArrays & Strings

14 people solved

Google

Hard

Machine Learning Engineer

Interpret Language-Model Perplexity

Interpret Language-Model Perplexity Define perplexity for an autoregressive language model, derive its relationship to average negative log-likelihood...

Machine Learning Engineer Locked

Implement a Text-Embedding Recommender Training Pipeline

Design a local training pipeline for a text-embedding recommender using nested member profiles, item text, and clicked or skipped interactions. The ex...

Find minimum racks for 2D bin packing

You are given N machines. Machine i requires two types of resources: (x_i, y_i). Each rack has capacity (A, B) for the two resources, and a machine mu...

Coding & AlgorithmsDynamic Programming

Software Engineer Locked

Design Disappearing Direct Messages

Design direct messages that disappear after viewing across multiple devices and unreliable networks. Define the deletion trigger and authoritative sta...

Software EngineerSenior+ Locked

Define and Calculate Employee Referral Counts

Compute a referral count for every employee from a list of referrer and referred pairs. The question tests defining direct versus downstream counts, h...

Software Engineering FundamentalsGraphs

Software EngineerSenior+

Implement a Versioned Key-Value Store

Design and implement an in-memory versioned key-value store. Requirements: - put(key, value, timestamp): store value for key at the given integer time...

Expectation and Variance of the Sum of Two Random Variables

Let X and Y be two random variables. How do you calculate $E[X + Y]$ and $\operatorname{Var}(X + Y)$? The report asks only for the two calculations. T...

Statistics & MathProbability

Design an Ad Click Aggregator for Last-Year Counts Using an Existing Logging API

Design a system that aggregates ad clicks. Unlike the commonly practiced version of this problem, which focuses on near-real-time counts over the last...

System DesignAds SystemsBatch & Stream Processing

Count Overlapping Rectangle Updates on a Grid

Count Overlapping Rectangle Updates on a Grid Implement range_add_counts(n, rectangles). Start with an n x n matrix of zeroes. Each rectangle is repre...

Coding & AlgorithmsGrids & Matrices

Software Engineer Locked

Check Whether Two Words Are Case-Insensitive Anagrams

Compare letter multiplicities case-insensitively to recognize anagrams, including repeated letters and empty strings.

Coding & AlgorithmsArrays & Strings

Sort Integers in Ascending Order with Constant Auxiliary Storage

Problem Return nums in ascending order, retaining every occurrence. Implement the sorting procedure yourself, without a built-in sorting routine, in O...

Coding & AlgorithmsSortingHeaps & Priority Queues

Test a Post-Creation Tab While Accounting for User Interference

Test a Post-Creation Tab While Accounting for User Interference A question-and-answer platform is considering adding a post-creation tab next to its e...

Analytics & ExperimentationExperiment Design (A/B Testing)Experiment Analysis & Readout

Measure the Longest Directed Cycle in a One-Exit Graph

Problem In the directed graph represented by edges, each node has at most one outgoing edge. edges[i] gives its destination, or -1 for no edge. Return...

Coding & AlgorithmsGraphs

20 people solved

Point72

Medium

Machine Learning Engineer

Review a RAG Answer Function as a Pull Request, Then Write Tests for Its Bugs

You are reviewing a pull request for a question-answering service built on retrieval-augmented generation (RAG) over documents that carry per-user rea...

Software Engineering FundamentalsRetrieval-Augmented GenerationTesting & Quality

Sort trade executions into a canonical order

You are building a small component in a trading system that consumes trade execution records from an upstream feed. The records may arrive out of orde...

Coding & AlgorithmsSorting

Software Engineer Locked

Walk Through Your Proudest Project, What Made It Special, and What You Would Change

Behavioral project deep-dive for software engineers: describe the project you are proudest of, what made it distinctive, what you learned, and what yo...

Behavioral & LeadershipProject Deep Dive

Software Engineer Locked

Deduplicate a 256 GB File on a Machine With 128 MB of Memory

Remove duplicate records from a single 256 GB file on a machine with only 128 MB of memory. Tests external-memory techniques such as hash partitioning...

Software Engineering FundamentalsSorting

Describing a Product Strategy You Defined, From Diagnosis to Results

Walk me through a time when you were the one who defined the strategy for a product. How did you arrive at it, and what happened? `hint Show the choic...

Behavioral & LeadershipProduct StrategyProject Deep Dive

9 people solved

Sep 29, 2026

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Tech Interview Questions

Return the Floor of a Square Root

Maximum Number of Balanced L/R Pieces

Interpret Language-Model Perplexity

Implement a Text-Embedding Recommender Training Pipeline

Find minimum racks for 2D bin packing

Design Disappearing Direct Messages

Define and Calculate Employee Referral Counts

Implement a Versioned Key-Value Store

Expectation and Variance of the Sum of Two Random Variables

Design an Ad Click Aggregator for Last-Year Counts Using an Existing Logging API

Count Overlapping Rectangle Updates on a Grid

Check Whether Two Words Are Case-Insensitive Anagrams

Sort Integers in Ascending Order with Constant Auxiliary Storage

Test a Post-Creation Tab While Accounting for User Interference

Measure the Longest Directed Cycle in a One-Exit Graph

Review a RAG Answer Function as a Pull Request, Then Write Tests for Its Bugs

Sort trade executions into a canonical order

Walk Through Your Proudest Project, What Made It Special, and What You Would Change

Deduplicate a 256 GB File on a Machine With 128 MB of Memory

Describing a Product Strategy You Defined, From Diagnosis to Results

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