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Tech Interview Questions

Practice the exact questions companies are asking right now.

Questions
11.9k
Companies
569
Updated
10.02.2026
11.9k Questions 569 Companies10.02.2026
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
OpenAI logo
OpenAI
Medium
Software Engineer Locked

Design a Cloud Development Environment

Design a secure cloud IDE around isolated workspaces, realtime editing, durable state, reconnection, scheduling, and operational controls.

System Design
20
0
186 people solved
Aug 24, 2026
Waymo logo
Waymo
Medium
Software Engineer

Drive a Car to an Unseen Destination Using Only Local Directions Without Circling

A car has to find its destination on a map it cannot see in advance. It only learns about the map as it drives: every time it arrives somewhere, it fi...

Software Engineering FundamentalsGraphs
2
0
24 people solved
Sep 10, 2026
Amazon logo
Amazon
Hard
Software Engineer

Design a Distributed Job Scheduler with Run Logs and Exactly-Once Execution

Design a distributed job scheduler. Clients submit jobs to run at a specified time or on a recurring schedule; the system dispatches each due job to a...

System DesignJob Scheduling & WorkflowsDistributed Coordination
1
0
38 people solved
Sep 3, 2026
StackAdapt logo
StackAdapt
Medium
Machine Learning Engineer

Reservoir Sampling: Uniform k-of-n Sample From a Stream of Unknown Length

Items arrive one at a time from a stream. You do not know the total number of items, n, in advance, and the stream may be far too large to store. Desi...

Statistics & MathMath & Number TheoryProbability
2
0
22 people solved
Sep 9, 2026
LinkedIn logo
LinkedIn
Medium
Software Engineer

Scale a NoSQL Key–Value Store to One Million QPS

How would you scale a single-node NoSQL key–value store to support the following workload? - 50 million key–value pairs. - 1 million total requests pe...

System DesignKey-Value StoresPartitioning & Consistent Hashing
6
0
49 people solved
Aug 31, 2026
Agoda logo
Agoda
Easy
Data EngineerSenior+

Rank Customers by Monthly Revenue with Competition Ties

Calculate each customer's revenue by calendar month, rank customers within each month, and return customers whose revenue rank is within a supplied li...

Data Manipulation (SQL/Python)SQL
1
0
21 people solved
Sep 11, 2026
Citadel logo
Citadel
Medium
Software Engineer

Choose 200 of a Million Records to Label, Improving on Uniform Random Sampling

A dataset holds about one million unlabeled records, and only 200 of them can be selected for labeling. The request is to pick the "useful" data, but ...

Statistics & MathSampling & Estimation
3
0
28 people solved
Aug 29, 2026
Squarepoint logo
Squarepoint
Medium
Data Scientist

Count Index Triplets With an Even Product Modulo a Given Number

Given an integer array nums, count the triplets of indices (i, j, k) with i < j < k for which the product nums[i] nums[j] nums[k] is even. Because t...

Coding & AlgorithmsMath & Number Theory
1
0
14 people solved
Sep 10, 2026
Mercor logo
Mercor
Hard
Software Engineer

Find the Probability That One Shop Supplies the Top Two Coffees

Four distinct coffees are ranked by score: two come from shop A and two from shop B. What is the probability that both coffees from A score higher tha...

Statistics & MathProbability
3
0
41 people solved
Sep 3, 2026
Physical Intelligence logo
Physical Intelligence
Hard
Software Engineer

Hand-Write a Bounded Cache for a Database-Backed Backend Service

In a one-hour hands-on coding round, you work in a remote development environment (an editor connected over SSH) that already contains a small backend...

Software Engineering FundamentalsCachingData Structure Design
2
0
17 people solved
Sep 8, 2026
Tesla logo
Tesla
Hard
Software EngineerSenior+

Design a Distributed Blob Storage System for Build Artifacts

This system design round was set in the interviewing team's own domain: design a distributed storage system for build artifacts, the outputs of the bu...

System DesignFile & Media StorageConsistency & Availability
3
0
29 people solved
Sep 7, 2026
ByteDance logo
ByteDance
Medium
Software EngineerIntern

TCP vs UDP: Key Differences and the Applications That Suit Each

Compare TCP and UDP. Explain how the two transport protocols differ, and for each one, describe the application scenarios where it is the right choice...

Software Engineering FundamentalsNetworking
0
0
9 people solved
Sep 25, 2026
Capital One logo
Capital One
Medium
Software Engineer

Return the Top Two Teams by Points, Goal Difference, and Tie Breakers

Return the indices of the first-place and second-place teams from four arrays of competition statistics. Team i has wins[i] wins, draws[i] draws, scor...

Coding & AlgorithmsSorting
3
0
39 people solved
Aug 27, 2026
Citadel Securities logo
Citadel Securities
Medium
Software Engineer

In-Memory Order Book with Price-Time Order, Level Aggregation and Order Cancel

Implement an in-memory order book for a single instrument. Orders arrive one at a time, each with a unique order id, a side (bid or ask), a price and ...

Software Engineering FundamentalsData Structure DesignTrading Systems
2
0
20 people solved
Sep 11, 2026
Goldman Sachs logo
Goldman Sachs
Easy
Data ScientistIntern Locked

Expected Number of Runs in Coin Tosses

Compute the expected number of same-side runs in 21 coin tosses, where a run is a maximal consecutive sequence of identical outcomes.

Statistics & Math
8
0
65 people solved
Sep 2, 2026
Capital One logo
Capital One
Medium
Data Scientist

Apply Leakage-Safe Imputation and Ordinal Encoding

You receive training and test tables with numeric columns, an ordered categorical column service_tier whose business order is bronze < silver < gold, ...

Machine Learning
7
0
98 people solved
Aug 20, 2026
LinkedIn logo
LinkedIn
Medium
Data Scientist

Diagnose a Drop in Applications from Job Recommendation Emails

Diagnose a Drop in Applications from Job Recommendation Emails Applications attributed to job-recommendation emails suddenly decline on one day. Descr...

Analytics & ExperimentationMetric DiagnosticsUser Behavior & Funnels
1
0
14 people solved
Sep 22, 2026
Attentive logo
Attentive
Medium
Software EngineerSenior+

Design a Simple Message Queue Service Without an Off-the-Shelf Broker

Design a simple message queue service using simpler primitives. You may not build it on an off-the-shelf queue or log such as Kafka: the point is to e...

System DesignMessaging & Event-Driven
1
0
9 people solved
Sep 24, 2026
Confluent logo
Confluent
Medium
Software Engineer

Complete a 9x9 Sudoku Puzzle That Has Exactly One Solution

You are given a 9 x 9 Sudoku puzzle in which some cells are filled with digits and the rest are empty. Fill every empty cell so that the completed boa...

Coding & AlgorithmsBacktracking & Recursion
2
0
21 people solved
Sep 12, 2026
Pinterest logo
Pinterest
Hard
Software Engineer

Insert Plus or Times Between Ordered Numbers to Reach a Target, Evaluated Left to Right

You are given a list of nonnegative integers and a target. Decide whether you can place either + or * between every pair of adjacent numbers so that t...

Coding & AlgorithmsBacktracking & Recursion
2
0
41 people solved
Sep 2, 2026
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