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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 testimonial
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_ testimonial
_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"

Chris testimonial
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 testimonial
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."

Jake testimonial
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 testimonial
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."

Carlos testimonial
CarlosFull Stack, Shopify

"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."

boba.tea.vibes testimonial
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."

Andy testimonial
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 testimonial
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."

Shruti testimonial
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 testimonial
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."

Bianca testimonial
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 testimonial
tambrahm007

"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."

toa testimonial
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 testimonial
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_ testimonial
_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"

Chris testimonial
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 testimonial
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."

Jake testimonial
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 testimonial
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."

Carlos testimonial
CarlosFull Stack, Shopify

"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."

boba.tea.vibes testimonial
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."

Andy testimonial
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 testimonial
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."

Shruti testimonial
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 testimonial
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."

Bianca testimonial
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 testimonial
tambrahm007

"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."

toa testimonial
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
Robinhood logo
Robinhood
Medium
Software Engineer

Design a Cron Job Scheduler for 100K Jobs With At-Least-Once Execution

Design a job scheduler service. Users register recurring jobs, each with a cron expression that says when it runs, and the service must start a run of...

System DesignJob Scheduling & WorkflowsDistributed Coordination
5
0
64 people solved
Oct 2, 2026
Tower logo
Tower
Medium
Quantitative ResearcherIntern

Can Test Correlation Exceed Training Correlation?

A linear model is fitted on 70% of a dataset containing 100,000 observations. Its predictions have Pearson correlation 0.20 with the training targets....

Statistics & MathRegression & Statistical ModelingModel Evaluation
1
0
16 people solved
Oct 24, 2026
Snapchat logo
Snapchat
Medium
Machine Learning Engineer

Evaluate a Binary Model with Confusion Counts, Calibration, and Normalized Entropy

Explain the four cells of a binary classification confusion matrix, useful offline metrics, model calibration, and normalized entropy. Connect each me...

Machine LearningModel Evaluation
1
0
14 people solved
Oct 28, 2026
Google logo
GoogleAmazonMicrosoft

Also asked at Microsoft, Meta, Bloomberg, TikTok, Goldman Sachs, Oracle, Zoho, Mastercard, TCS, Adobe, IBM, Infosys, Huawei

Hard
Software Engineer

List All Nonattacking Queen Boards

Problem Place n queens on an n by n chessboard so that no pair shares a row, column, or diagonal. Return every distinct valid board, without repeated ...

Coding & AlgorithmsBacktracking & RecursionGrids & Matrices
4
0
30 people solved
Google logo
GoogleAmazonMeta

Also asked at Meta, Microsoft, Bloomberg, Jump Trading

Hard
Software Engineer

Select a Permutation by Its Lexicographic Rank

Problem List the permutations of the digits 1 through n in increasing lexicographic order. Return the permutation at the one-based position k, as a st...

Coding & AlgorithmsMath & Number Theory
3
0
32 people solved
Medium
Software Engineer

Billing Calculator: Subscription Fees, Mid-Period Upgrades and Tiered Usage

Implement a billing calculator for a product that charges customers a subscription fee and usage-based fees. In the reported online assessment this wa...

Software Engineering FundamentalsLow-Level Design (OOP)Payments & Ledgers
1
0
24 people solved
Oct 13, 2026
OpenAI logo
OpenAI
Hard
Software Engineer Locked

Fault-Tolerant Work Queue with Leases, Fencing Tokens and DAG Task Dependencies

Implement a fault-tolerant work queue in which workers claim tasks under expiring leases, crashed workers' tasks are reassigned, and late reports from...

Software Engineering FundamentalsJob Scheduling & WorkflowsDistributed Coordination
26
0
239 people solved
Sep 20, 2026
Snapchat logo
Snapchat
Medium
Machine Learning Engineer

Find a Strictly Unimodal Array Peak and Analyze Plateaus

An array strictly increases up to a unique maximum and strictly decreases afterward. Return the index of that peak using binary search. Constraints an...

Coding & AlgorithmsBinary Search
1
0
15 people solved
Oct 28, 2026
Glean logo
Glean
Medium
Software EngineerIntern

Shortest Manhattan Distance Between Any X and Any Y in a String or Grid

The interview had two parts. The first gave a string such as "XOXOXXOOYOXO" and asked for the shortest distance between any X and any Y (here 2). The ...

Coding & AlgorithmsGrids & Matrices
5
0
61 people solved
Sep 30, 2026
Airbnb logo
Airbnb
Medium
Software Engineer Locked

Implement a Capacity-Aware In-Memory File Store

Implement a capacity-aware in-memory file store spanning file operations, search, users, ownership, compression, and decompression. Follow exact capac...

Coding & AlgorithmsLow-Level Design (OOP)Data Structure Design
86
0
644 people solved
Aug 2, 2026
Optiver logo
Optiver
Hard
Software EngineerNew Grad Locked

Implement Expiration-Aware Retrieval Across Storage Levels

Specify an expiration-aware storage class with ordered capacity levels and deterministic item retrieval. Each lookup scans levels by priority, conside...

Software Engineering FundamentalsData Structure DesignHeaps & Priority Queues
97
1
957 people solved
Aug 26, 2026
OpenAI logo
OpenAI
Medium
Applied Scientist

Extensible card-hand ranking: three of a kind, flush, pair and a discard rule

Build a small card game in code. Each player holds a hand of cards; the program ranks the hands, decides the outcome, and returns a log of the whole p...

Software Engineering FundamentalsLow-Level Design (OOP)
12
0
116 people solved
Sep 17, 2026
Oracle logo
Oracle
Medium
Software Engineer

Cache an Expensive Service Call, Test It, Then Make It Thread-Safe

A service your code depends on is very expensive to call. Make it cheap to use by putting a cache in front of it. Write the code, then write test case...

Software Engineering FundamentalsCachingConcurrency
1
0
22 people solved
Oct 10, 2026
LinkedIn logo
LinkedIn
Medium
Software EngineerSenior+

Design a Distributed Key-Value Store for a Small Company's Internal Use

Design a distributed key-value store for internal use at a small company. Internal services store, read and delete values by key, and the data and tra...

System DesignKey-Value StoresPartitioning & Consistent Hashing
8
0
65 people solved
Sep 29, 2026
Oracle logo
Oracle
Medium
Software Engineer

Remove parentheses from a plus/minus expression by propagating signs

You are given an algebraic expression made of single-letter variables, the operators + and -, and parentheses. Simplify it by removing every pair of p...

Coding & AlgorithmsParsing & InterpretersStacks & Queues
1
0
15 people solved
Oct 29, 2026
Mercor logo
Mercor
Medium
Software Engineer Locked

Debug an Async Payment Refund Function with Retries, Then Make It Idempotent

Find the defects in a short async Python function that issues a payment refund with up to three attempts and then marks the request done, then explain...

Software Engineering FundamentalsDebuggingDistributed Transactions & Idempotency
9
0
178 people solved
Sep 3, 2026
Lyft logo
Lyft
Medium
Software Engineer

Design a Charity Donation System with Payments, a Ledger and Payouts to Charities

Design a charity donation system: users pick a charity on the platform and donate money to it, the platform charges the user's payment method, and the...

System DesignPayments & LedgersDistributed Transactions & Idempotency
1
0
9 people solved
Oct 25, 2026
Databricks logo
Databricks
Medium
Machine Learning Engineer

Design a Messaging App with Group Sends, Chat History and Chat Deletion

Design a messaging app that supports the following: 1. A user can send a new message to one recipient or to several recipients. 2. A user can retrieve...

System DesignReal-Time SystemsStorage & Sharding
1
0
35 people solved
Sep 11, 2026
Amazon logo
Amazon
Medium
Software Engineer Locked

Resume Project Deep Dive: Tech Stack Choices, Trade-offs, Business Logic and Ownership

Walk an interviewer through a project from your resume, explaining why the team chose its technology stack, which trade-offs those choices carried, ho...

Behavioral & LeadershipProject Deep Dive
5
0
101 people solved
Sep 20, 2026
Reducto logo
Reducto
Medium
Software Engineer

Group Document Bounding Boxes into Indentation Levels with a 0.01 Left Tolerance

A document parser returns the text blocks of a document as bounding boxes, listed from top to bottom. Each box has left, top, width, height and page f...

Coding & AlgorithmsSorting
4
0
44 people solved
Oct 13, 2026
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