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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
Medium
Data Scientist

Implement anagram check and stable deduplication

Part A — Anagram checker: Write a function is_anagram(a: str, b: str, locale: str = 'en') -> bool that returns True iff a and b are anagrams under the...

Coding & Algorithms
9
0
107 people solved
Oct 13, 2025
Microsoft logo
Microsoft
Medium
Software Engineer Locked

Reconstruct DNA from tagged fragments

This question evaluates understanding of sequence reconstruction, graph modeling, and traversal/orientation constraints, focusing on ordering labeled ...

Coding & AlgorithmsGraphs
9
0
159 people solved
Mar 1, 2026
HackerRank logo
HackerRank
Medium
Machine Learning Engineer

Count Good Subsequences With Equal Character Frequencies

A subsequence is formed by deleting zero or more characters from a string without changing the order of the remaining characters. A non-empty subseque...

Coding & Algorithms
3
0
38 people solved
Apr 23, 2026
Google logo
Google
Medium
Data Scientist

Simulate Coin Flips to Determine Fairness via Empirical Distribution

Scenario You must test whether a coin is fair by simulation. Question Write code that repeatedly simulates n coin flips, records the number of heads, ...

Coding & AlgorithmsHypothesis TestingProbability
14
0
135 people solved
Aug 4, 2025
Upstart logo
Upstart
Medium
Data Scientist

Estimate and Derive Regression Coefficient for X on y

Estimate and Derive Regression Coefficient for X on y Statistics & Probability Onsite — Two-Part Question Context - You have a simple linear data-gene...

Statistics & MathRegression & Statistical ModelingSampling & Estimation
97
0
392 people solved
Aug 4, 2025
Citi logo
Citi
Medium
Software Engineer

Solve two logic brain teasers

Two Classic Logic/Optimization Puzzles Puzzle 1: Heavier Ball with a Balance Scale You have 12 visually identical balls. Exactly one ball is heavier t...

Statistics & MathPuzzles & BrainteasersGreedy
11
0
165 people solved
Sep 6, 2025
C3 AI logo
C3 AI
Hard
Data Scientist Locked

Give Evidence-Based Strengths, Weaknesses, and Feedback

Answer strengths, weaknesses, manager and peer feedback, and project-learning questions with one evidence-based narrative that shows self-awareness an...

Behavioral & LeadershipSelf-Awareness & Growth
1
0
25 people solved
Aug 15, 2026
Millennium logo
Millennium
Medium
Data Scientist Locked

Design a Governed Agent for Portfolio Rebalancing

Design a governed agent that can propose portfolio rebalancing and execute only when deterministic services authorize every step. The candidate must s...

ML System Design
10
0
85 people solved
Jul 30, 2026
Illumio logo
Illumio
Hard
Software EngineerSenior+ Locked

Design a Time-Series Database

Design a time-series database for sustained measurement ingest and range queries across labeled series. Explore partitioning, immutable storage, label...

System Design
1
0
37 people solved
Jul 9, 2026
Instacart logo
Instacart
Medium
Backend EngineerSenior+ AI Locked

Fix the Broken Search Filter in a Book Catalog API

This question tests a backend engineer's ability to implement correct filtering logic, including case-insensitive substring matching, whitespace trimm...

Coding & Algorithms
8
0
68 people solved
Jun 19, 2026
Citadel logo
Citadel
Medium
Data Scientist

Object-Oriented Design of a Battleship Game

Design the game of Battleship in code. Start from the basic classes and interfaces, then work through the game's operations, how the board's state is ...

Software Engineering FundamentalsLow-Level Design (OOP)Simulation & State Machines
0
0
17 people solved
Nov 3, 2025
Meta logo
Meta
Medium
Software Engineer

Find kth largest element in array

Question Given an unsorted array of integers nums and an integer k, return the k-th largest element in the array. The 1st largest element is the maxim...

Coding & Algorithms
9
0
143 people solved
Dec 8, 2025
Instacart logo
Instacart
Medium
Software Engineer Locked

Discuss an Interesting Project and a Deployment Mistake

Discuss an interesting project and a deployment mistake with clear ownership, technical tradeoffs, recovery evidence, and lessons that changed later w...

Behavioral & LeadershipFailure & LearningProject Deep Dive
3
0
34 people solved
Sep 6, 2026
Citadel logo
Citadel
Medium
Data Scientist

Implement Piecewise Linear Interpolation and Extrapolation

Given n points (x_knots[i], y_knots[i]) in arbitrary order and a query x_input, implement piecewise linear interpolation without using an interpolatio...

Coding & Algorithms
8
0
57 people solved
Apr 15, 2026
Intuit logo
Intuit
Medium
Data Scientist

Exclude free subscribers via anti-join

Extend your previous monthly new-subscriber + YoY query to exclude companies that ever received a free subscription, using an anti-join against Free_S...

Data Manipulation (SQL/Python)
5
0
70 people solved
Oct 13, 2025
Concentric Ai logo
Concentric Ai
Medium
Software Engineer Locked

Count Students Outside Their Height-Sorted Positions

Count the positions where students' current heights differ from the nondecreasing arrangement of the same multiset of heights.

Coding & Algorithms
3
0
26 people solved
Aug 10, 2026
Stripe logo
Stripe
Medium
Data Scientist

Write SQL to detect recurring non-subscription users

You have two tables: merchant and transaction. Assume 'today' is 2025-09-01. Schema: merchant(merchant_id INT PK, merchant_name TEXT, country TEXT, cr...

Data Manipulation (SQL/Python)
3
0
47 people solved
Oct 13, 2025
Confluent logo
Confluent
Easy
Software Engineer Locked

Process pod logs with global increments and pop-min

This question evaluates understanding of data structures—particularly priority queues/heaps—and techniques for efficiently handling global/bulk update...

Coding & AlgorithmsHeaps & Priority Queues
23
0
261 people solved
Feb 12, 2026
OpenAI logo
OpenAI
Hard
Machine Learning Engineer

Design an ML search system

Design an ML‑Powered Enterprise Document Search System Context You are designing a multi‑tenant enterprise search system that indexes documents from m...

ML System DesignSearch RelevanceEmbeddings & Vector Search
18
0
241 people solved
Sep 6, 2025
Dropbox logo
Dropbox
Medium
Software Engineer Locked

Implement KV Store and Token Bucket

This question evaluates a candidate's skills in implementing core data structures and concurrent algorithms, specifically in-memory key-value store de...

Coding & AlgorithmsRate LimitingConcurrency
14
0
137 people solved
Oct 3, 2025
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