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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
MongoDB logo
MongoDBAppleGustoGoogle

Also asked at Gusto, Google

Easy
Software Engineer

Maximize Eight-Dollar Shares without Giving Anyone Four

Problem Distribute all money dollars among children children. Each child must receive at least one dollar, and no child may receive exactly four dolla...

Coding & AlgorithmsGreedyMath & Number Theory
2
0
16 people solved
Goldman Sachs logo
Goldman SachsMicrosoftGoogle

Also asked at Google, Palantir, PayPal, Bloomberg, Rubrik

Medium
Software Engineer

Smallest String Reachable Through Allowed Index Swaps

Problem Each pair gives two zero-based positions whose characters may be swapped any number of times. Return the lexicographically smallest string rea...

Coding & AlgorithmsGraphsSorting
0
0
13 people solved
Google logo
GoogleMetaAmazon

Also asked at Amazon, Microsoft, Bloomberg, Anduril, Karat, Criteo, Tripadvisor, Spotify, SAP

Easy
Software Engineer

Check Whether Available Letters Can Form a Note

Check Whether Available Letters Can Form a Note Given lowercase strings ransomNote and magazine, return whether the note can be formed using letters f...

Coding & AlgorithmsArrays & Strings
1
0
11 people solved
Citadel logo
Citadel
Easy
Software EngineerIntern Locked

Reduce Hashing and Safely Delete Shared File Content

Design file-content deduplication with deferred hashing, collision checks, stable shared-content identities, and reference-counted deletion.

System DesignData Structure DesignFile & Media Storage
26
1
268 people solved
Sep 3, 2026
Decagon logo
Decagon
Medium
Software Engineer Locked

Implement a Recipe Cart

This question evaluates the ability to design and implement stateful data structures and aggregation logic for tracking ingredient counts, applying ti...

Coding & AlgorithmsData Structure DesignStacks & Queues
43
0
323 people solved
May 20, 2026
Google logo
Google
Medium
Software EngineerSenior+

Assign the Minimum Number of Cars to Rental Requests

Each rental request has a unique request ID, a start time, and an end time. Assign a car ID to every request so that one car is never used by overlapp...

Coding & AlgorithmsIntervals & SchedulingGreedy
1
0
32 people solved
Jun 27, 2026
Amazon logo
AmazonGoogleMicrosoft

Also asked at Microsoft, Bloomberg, Apple, Meta, Roblox, TCS, BCG, Oracle, Goldman Sachs, Uber, Snowflake, Zeta Global, Nutanix, MathWorks

Medium
Software Engineer

Minimize CPU Intervals with Equal-Label Cooldowns

Problem Every tasks entry is a unit-time task labeled A through Z. Execute them in any order, inserting idle intervals if needed. Equal labels must ha...

Coding & AlgorithmsGreedyIntervals & Scheduling
0
0
12 people solved
Reddit logo
Reddit
Hard
Machine Learning Engineer Locked

Explain and Reduce Position Bias in Ranking

Explain position bias in click-based ranking, distinguish examination from relevance, and assess propensity estimation, debiasing, and reliable evalua...

Machine LearningRanking ModelsModel Evaluation
11
0
76 people solved
Aug 23, 2026
Glean logo
Glean
Medium
Software Engineer

Design a Test Strategy for a System That Counts the Leaves on a Large Tree

In a QA engineer interview, the testing scenario was: how would you test a system that counts the number of leaves on a large tree? The prompt is deli...

Software Engineering FundamentalsTesting & Quality
1
0
23 people solved
Sep 30, 2026
Fuse Energy logo
Fuse Energy
Medium
Software Engineer

Design a Fitness Activity Tracking App with Followers and Leaderboards

Design a fitness activity tracking app where followers can see current trails, users can query top activities by time range, and leaderboards are supp...

System DesignSearch & Feed Systems
46
0
409 people solved
Apr 9, 2026
Capital One logo
Capital One
Medium
Data ScientistSenior+ Locked

Compare Logistic Regression and Random Forest in Python

Compare logistic regression and random forest for a binary classification problem implemented in Python. Cover preprocessing pipelines, regularization...

Machine LearningSupervised LearningModel Evaluation
33
0
249 people solved
May 31, 2026
Google logo
GoogleMicrosoftBloomberg

Also asked at Bloomberg, Meta, Amazon

Easy
Software Engineer

Apply Score-Record Operations and Sum the Remaining Scores

Problem Start with an empty score record. An integer token appends that score; + appends the sum of the latest two remaining scores; D appends twice t...

Coding & AlgorithmsStacks & QueuesSimulation & State Machines
0
0
11 people solved
Google logo
Google
Hard
Machine Learning Engineer Locked

Explain Importance Sampling in LLM Training

Study importance sampling through likelihood ratios, support assumptions, off-policy LLM data, variance growth, clipping, and diagnostics.

Machine Learning
5
0
95 people solved
Aug 14, 2026
Headlands logo
Headlands
Medium
Data Scientist Locked

t-Stat With an Added Orthogonal Regressor, Live Sharpe Check, and Absolute-Loss Estimator

Three written quantitative questions: how an OLS t-statistic changes when an orthogonal regressor is added, how many flat live trading days should mak...

Statistics & MathHypothesis TestingRegression & Statistical Modeling
8
0
63 people solved
Aug 30, 2026
Grammarly logo
GrammarlyGoogleAmazon

Also asked at Amazon, Microsoft, JPMorgan Chase, Meta

Medium
Software Engineer

Best Value from Up to Two Separate Events

Problem Each event has a start time, an end time and a value. Choose at most two events to attend, with no overlap between their inclusive time interv...

Coding & AlgorithmsIntervals & SchedulingSorting
1
0
17 people solved
Nuro logo
Nuro
Hard
Software Engineer Locked

Search Large Vehicle Records with Bounded Memory

Design range search over petabytes of large vehicle records with one-year retention, selective indexes, bounded-memory execution, and stable result de...

System DesignIndexing & Query PerformanceStorage & Sharding
10
0
111 people solved
Aug 31, 2026
Google logo
GoogleMicrosoftMeta

Also asked at Meta, Amazon, Bloomberg, LinkedIn, Oracle, Palo Alto Networks, Josh Technology

Easy
Software Engineer

Mirror Binary-Tree Child Links through the Original Root

Problem Invert a binary tree by exchanging left and right children throughout the tree, and return its root. Keep the supplied TreeNode interface with...

Coding & AlgorithmsTrees
1
0
14 people solved
Airbnb logo
AirbnbGoogleRippling

Also asked at Rippling, Ramp, Amazon, Waymo, OpenAI

Hard
Software Engineer

Maintain Spreadsheet Cells with Persistent Sum Dependencies

Problem Implement Excel(height,width), with rows 1..height and columns A..width initially zero. set(row,column,val) replaces a cell value and removes ...

Coding & AlgorithmsData Structure DesignGraphs
3
0
27 people solved
Verkada logo
Verkada
Medium
Software Engineer Locked

Validate a Partially Filled Sudoku Board

Validate a partially filled Sudoku board by checking every row, column, and three-by-three box for duplicate digits. The prompt distinguishes validity...

Coding & Algorithms
13
0
112 people solved
Sep 4, 2026
ByteDance logo
ByteDance
Medium
Software EngineerNew Grad

Check Whether an n x n Tic-Tac-Toe Game Is Over (Win or Draw)

You are given the current state of an n x n tic-tac-toe board played by two players. A player wins by occupying all n cells of any row, any column, th...

Coding & AlgorithmsGrids & Matrices
3
0
53 people solved
Sep 13, 2026
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