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Tech Interview Questions

Practice the exact questions companies are asking right now.

Questions
12.2k
Companies
569
Updated
10.14.2026
12.2k Questions 569 Companies10.14.2026
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
Databricks logo
Databricks
Medium
Software EngineerSenior+ Locked

Explain storing files to disk with concurrency

This question evaluates systems programming concepts (OS I/O, page cache, fsync semantics) and Java concurrency mechanisms (thread-safety, synchroniza...

Software Engineering FundamentalsConcurrencyOperating Systems
21
0
395 people solved
Oct 10, 2025
Citadel logo
Citadel
Hard
Data Scientist

Sort a nearly sorted array

Given an array of length \(n\) in which every element is at most \(k\) positions away from its location in the fully sorted order, design an algorithm...

Coding & AlgorithmsHeaps & Priority QueuesSorting
8
0
146 people solved
Jan 30, 2026
LinkedIn logo
LinkedIn
Medium
Software Engineer

Check perfect square using binary search

Perfect Square Check (Binary Search) Given a positive integer n, determine whether it is a perfect square (i.e., there exists an integer x such that x...

Coding & AlgorithmsBinary Search
13
2
174 people solved
Feb 11, 2026
Google logo
Google
Medium
Data Scientist

Implement piecewise linear interpolation for time-to-empty

Time-to-Empty from a Discharge Curve (Piecewise Linear Interpolation) Implement a function time_to_empty(checkpoints, current_soc) that returns the nu...

Coding & Algorithms
7
0
74 people solved
Oct 13, 2025
Applied Intuition logo
Applied Intuition
Hard
Software Engineer

Track simulations and report timeouts

You are implementing a monitoring component for many concurrent simulations. Each simulation produces a stream of event objects of the form: - sim_id ...

Coding & Algorithms
5
0
69 people solved
Dec 8, 2025
Point72 logo
Point72
Medium
Quantitative Researcher

Solve Three Probability Models

Solve Three Probability Models Solve three independent probability questions. Show the sample space or stochastic assumptions in each part and give an...

Statistics & Math
3
0
48 people solved
Dec 14, 2025
Snapchat logo
Snapchat
Medium
Software Engineer Locked

Find Maximum Island Perimeter

This question evaluates grid traversal and connected-component analysis skills, focusing on reasoning about perimeters and boundary conditions in bina...

Coding & Algorithms
3
0
66 people solved
Apr 5, 2026
Asana logo
Asana
Medium
Software Engineer Locked

Design an Extensible Animal-Chess Game Engine

Design an extensible object-oriented engine for a turn-based animal-chess game whose concrete rules arrive separately. Separate immutable state, move ...

Software Engineering FundamentalsLow-Level Design (OOP)
15
0
231 people solved
Jul 16, 2026
EliseAI logo
EliseAI
Medium
Software Engineer

Explain prompt engineering strategies for chatbots

Prompt Engineering for Reliable, Steerable, and Safe Chatbots Context You are designing a production-grade chatbot that must be reliable (consistent, ...

Machine LearningPrompt EngineeringLLM Applications
22
0
165 people solved
Sep 6, 2025
Fannie Mae logo
Fannie Mae
Medium
Data Scientist

Contrast UI vs backend testing; design UI-change test cases

Part A — Differentiate UI vs backend testing: For a single-page web app backed by a BFF (backend-for-frontend) that calls a payment API, explain preci...

Behavioral & Leadership
3
0
70 people solved
Oct 13, 2025
Apple logo
Apple
Medium
Machine Learning Engineer

Optimize image filters on device

You are shipping an image-filter feature that must run entirely on a mobile device. Users expect preview latency below 30 ms on common phones, memory ...

ML System Design
7
0
126 people solved
Mar 1, 2026
Amazon logo
Amazon
Medium
Frontend EngineerNew Grad Locked

Format a Forest of Nested Comments

Format an arbitrarily ordered forest of comments as deterministic preorder trees while preserving sibling order and drawing correct continuation and f...

Coding & Algorithms
4
0
45 people solved
Aug 22, 2026
Google logo
Google
Medium
Software EngineerIntern Locked

Find shortest subarray with ≥k distinct integers

This question evaluates understanding of array algorithms, handling of distinct-element counting, and the ability to design time- and space-efficient ...

Coding & Algorithms
9
0
81 people solved
Jan 6, 2026
Akuna Capital logo
Akuna Capital
Hard
Software Engineer Locked

Maximize Distinct Values with Cross-Array Swaps

Given arrays a and b of equal length and an integer k, perform at most k swaps. Work through the function contract, boundary cases, correctness argume...

Coding & Algorithms
2
0
42 people solved
May 24, 2026
Two Sigma logo
Two Sigma
Medium
Data Scientist Locked

Design features for house price prediction

This question evaluates competence in feature engineering, data preprocessing, baseline regression modeling, and model evaluation for tabular price pr...

Machine LearningFeature EngineeringData Cleaning & Wrangling
17
0
130 people solved
Jan 22, 2026
xAI logo
xAI
Medium
Software Engineer Locked

Explain process vs thread and memory-sharing risks

This question evaluates a candidate's understanding of OS concurrency fundamentals, specifically the distinction between processes and threads, memory...

Software Engineering FundamentalsOperating SystemsConcurrency
11
0
130 people solved
Oct 27, 2025
Meta logo
Meta
Medium
Data Scientist

Compute video-call SQL metrics with edge cases

Use 'today' = 2025-09-01. Assume UTC timestamps. Write SQL to answer both parts below and call out how your queries handle edge cases (duplicates, fai...

Data Manipulation (SQL/Python)SQLData Cleaning & Wrangling
31
1
268 people solved
Oct 13, 2025
Meta logo
Meta
Hard
Software Engineer

Design a basic bank system API

In-Memory Bank System: API, Data Model, Invariants, Semantics, and Edge Cases Goal Design and implement an in-memory bank system that supports account...

System Design
14
0
102 people solved
Sep 6, 2025
TikTok logo
TikTok
Medium
Backend Software Engineer

Explain Database Index Benefits and Write Costs

Explain Database Index Benefits and Write Costs Why do relational databases use indexes, and why is creating an index on every column usually a poor d...

Software Engineering Fundamentals
2
0
25 people solved
Apr 12, 2026
TikTok logo
TikTok
Medium
Software Engineer

Solve string grouping and tree right-view problems

Problem 1: Group words that are anagrams You are given an array of strings words. Two strings are anagrams if they contain the same characters with th...

Coding & AlgorithmsArrays & StringsTrees
12
0
130 people solved
Feb 11, 2026
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