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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
Google logo
Google
Hard
Software Engineer

Least Palindromic Permutation Above a Target

Problem You are given lowercase English strings s and target of the same length. Return the lexicographically smallest string satisfying all of these ...

Coding & AlgorithmsGreedyArrays & Strings
0
0
8 people solved
Optiver logo
Optiver
Hard
Data Scientist

Find next terms in sequences

Pattern Recognition: Find the Rule and Next Term You are given 8 number sequences. For each sequence: - Identify a clear rule that generates the terms...

Statistics & MathPuzzles & Brainteasers
39
0
272 people solved
Sep 6, 2025
Concentric Ai logo
Concentric Ai
Medium
Software Engineer Locked

Maximize Profit Under a Bitwise-OR Limit

Choose a subset of items whose combined bitwise OR does not exceed a numeric limit and return the maximum total profit, with the empty subset availabl...

Coding & Algorithms
6
0
85 people solved
Aug 10, 2026
Harvey logo
Harvey
Medium
Backend Engineer

Resolve conflict across teams

Describe a time when you had to coordinate between two teams that were in conflict or seriously misaligned. What caused the disagreement, how did you ...

Behavioral & LeadershipConflict & CollaborationCommunication & Stakeholders
19
0
156 people solved
Feb 18, 2026
Uber logo
Uber
Medium
Machine Learning Engineer

Design a feed ranking system

Design a machine-learning-based feed ranking system for a consumer product. The system should rank candidate posts or items for a user's home feed in ...

ML System DesignRecommendation SystemsRanking Models
13
0
254 people solved
Mar 1, 2026
Jain Global logo
Jain Global
Medium
Data Engineer Locked

Model Effective-Dated Compliance Restrictions for Securities

Model effective-dated compliance restrictions across companies, countries, and securities in a versioned security master. Work through temporal schema...

System Design
4
0
43 people solved
Jul 26, 2026
DoorDash logo
DoorDash
Medium
Data ScientistSenior+ Locked

Evaluate a Bike-Delivery Pilot with Marketplace Metrics

A marketplace experimentation case about launching a bike-delivery option. Candidates select a city, quantify parking friction, define business and op...

Analytics & Experimentation
9
0
81 people solved
Jul 18, 2026
Salesforce logo
Salesforce
Medium
Software EngineerSenior+

Generate All Balanced Parenthesis Strings with n Pairs in Sorted Order

Given a number of pairs n, list every string made of exactly n opening brackets ( and n closing brackets ) that is balanced. A string is balanced when...

Coding & AlgorithmsBacktracking & Recursion
1
0
15 people solved
May 6, 2026
Google logo
GoogleAmazon
Medium
Software Engineer

Finish a Land and Water Ride from Large Lists

Finish a Land and Water Ride from Large Lists A visitor must choose exactly one land ride and exactly one water ride, and complete them sequentially i...

Coding & AlgorithmsIntervals & SchedulingGreedy
0
0
9 people solved
Google logo
Google
Medium
Software Engineer

Return Words Matching a Typed Prefix

Given words and a query prefix, return all words starting with that prefix in lexicographic order. Implement: `python def prefix_matches(words: list[s...

Coding & Algorithms
7
0
75 people solved
Mar 6, 2026
Google logo
Google
Medium
Data Scientist

Estimate population singletons from a 10% log

A daily search log has one row per query string. You draw a 10% simple random sample of rows without replacement. Define a “unique query” (singleton) ...

Statistics & MathSampling & EstimationProbability
33
0
225 people solved
Oct 13, 2025
Discord logo
Discord
Medium
Software Engineer

Design leader election using Redis leases

Design Leader Election Using Redis Leases You have N stateless service instances all running the same code. At any instant, exactly one instance must ...

System DesignDistributed CoordinationFault Tolerance & Failover
59
0
464 people solved
Oct 25, 2025
PayPal logo
PayPal
Medium
Data Scientist

Design and Analyze A/B Test for Cashback Program

Design and Analyze A/B Test for Cashback Program A/B Test Design: Checkout Cashback Program (PayPal) Scenario PayPal plans to launch a checkout cashba...

Analytics & ExperimentationExperiment Design (A/B Testing)Metrics & KPIs
6
0
117 people solved
Aug 4, 2025
NVIDIA logo
NVIDIA
Medium
Software Engineer

Solve unique triplets summing to target

Solve unique triplets summing to target Implement a function that, given an integer array nums and an integer target T, returns all unique triplets [x...

Coding & AlgorithmsTwo Pointers & Sliding WindowSorting
12
0
191 people solved
Jul 15, 2025
Lambda logo
Lambda
Hard
Software Engineer

Design and explain infra, K8s, routing, and fleet

System Design and Operations Deep-Dive Context: You are interviewing for a Software Engineer role with a focus on system design and engineering. Provi...

System DesignCI/CD & DeploymentContainers & Orchestration
30
0
205 people solved
Sep 6, 2025
Microsoft logo
Microsoft
Easy
Data Scientist

Explain KNN and how to tune it

K-Nearest Neighbors (KNN) fundamentals You are interviewing for a Data Scientist role. 1. Explain how the KNN algorithm works for both classification ...

Machine LearningSupervised LearningFeature Engineering
43
0
416 people solved
Jan 17, 2026
Google logo
Google
Easy
Data Scientist

Count super-streak segments in an event stream

You are given a time-ordered sequence of events. Each event has: - type, a string or integer event type. - ts, an integer timestamp in milliseconds or...

Coding & AlgorithmsSimulation & State MachinesBatch & Stream Processing
38
0
292 people solved
Jan 2, 2025
Google logo
Google
Medium
Software Engineer

How to host many domains on one IP?

You have a single Linux server with one public IPv4 address. A coffee shop, butcher shop, and auto repair shop each want their own website and their o...

System DesignNetworking
35
0
250 people solved
Feb 1, 2026
Amazon logo
Amazon
Medium
Software Engineer

Implement a Single-Node Priority Pub/Sub

Implement a simplified in-memory publish-subscribe system that runs on a single machine. The system should support users subscribing to topics with a ...

Software Engineering FundamentalsMessaging & Event-DrivenConcurrency
4
0
93 people solved
Apr 9, 2026
Google logo
Google
Medium
Data ScientistSenior+

Simulate Uniform(0,1) from random bits

Assume you have access to a function rand_bit() that returns 0 or 1 with equal probability and independent across calls. How would you generate a rand...

Coding & Algorithms
9
0
151 people solved
Nov 24, 2025
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