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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
Lambda logo
Lambda
Medium
Software Engineer

Implement a Persistent Key-Value Store on Top of a Fixed-Size Block Device

Implement a key-value store on top of a block device. The device is the only storage you have: it holds a fixed number of fixed-size blocks addressed ...

Software Engineering FundamentalsKey-Value StoresDatabase Internals
1
0
18 people solved
Oct 25, 2026
Meta logo
Meta
Hard
Data Engineer

Task Manager: Filter, Deduplicate, Multi-Key Sort, Then Order Subtasks Around Parents

Implement a TaskManager class. Its constructor receives a list of existing tasks, and its method print_prioritized_tasks() prints the tasks that pass ...

Software Engineering FundamentalsSortingTrees
1
0
16 people solved
Nov 7, 2026
OpenAI logo
OpenAI
Hard
Software EngineerNew Grad

Count Ordered Four-Shop Road Paths That Visit One Shop of Each Type

You need to buy school supplies at four different kinds of shop: a bookshop for a workbook, a school-supply shop for glue, a sports store for a pair o...

Coding & AlgorithmsGraphs
11
0
161 people solved
Oct 3, 2026
Meta logo
Meta
Medium
Machine Learning Engineer

Implement the Forward Pass of Multi-Head Attention From Scratch

Implement the forward pass of a multi-head attention layer from scratch. The interviewer provides no test cases, so correctness has to be argued from ...

Machine LearningML CodingTransformers & Attention
35
0
423 people solved
Sep 25, 2026
Citadel logo
Citadel
Medium
Software Engineer

Constant-Time Ticker Portfolio With Uniform, Weighted and Streaming Random Picks

Design and implement a portfolio of stock ticker symbols (strings such as AAPL) that supports three operations, each in constant time: - add(ticker): ...

Software Engineering FundamentalsData Structure DesignMath & Number Theory
0
2
11 people solved
Nov 6, 2026
Bloomberg logo
BloombergAmazonGoogle

Also asked at Google, Microsoft, Meta, Arista Networks, Revolut, Infosys, Oracle, Nutanix, Apple, ByteDance, TikTok, NVIDIA, Palo Alto Networks

Medium
Software Engineer

Reverse an Inclusive Segment of List Nodes

Problem Reverse the nodes from position left through position right in a singly linked list, leaving the rest in its original order. Positions are one...

Coding & AlgorithmsLinked Lists
7
0
70 people solved
OpenAI logo
OpenAI
Hard
Software Engineer Locked

Leftmost-Fit Memory Allocator: Allocate Consecutive Units and Free by Owner

Simulate a memory allocator over n units: each allocation takes the leftmost run of consecutive free units for an owner, and each free releases all of...

Coding & AlgorithmsData Structure DesignTrees
66
0
495 people solved
Sep 20, 2026
Anthropic logo
Anthropic
Medium
Software Engineer Locked

Performance-Model a Sharded Matrix Multiply: FLOPs, Memory, Network and Roofline

Model the performance of a matrix multiplication by hand: count floating-point operations, memory bytes and network bytes, apply the roofline model to...

ML System DesignGPU Programming
30
0
270 people solved
Sep 18, 2026
Apple logo
Apple
Medium
Software Engineer

Validate a Binary Search Tree with a Supplied Value Comparator

Determine whether a binary tree is a valid binary search tree when node values are not restricted to numeric types. A supplied comparison function can...

Coding & AlgorithmsTrees
4
1
34 people solved
Oct 23, 2026
Applied Intuition logo
Applied Intuition
Hard
Software Engineer

Scale Conway's Game of Life to a Dense 1M x 1M Board With File-Backed Row Streaming

Conway's Game of Life is played on a grid of cells, each either alive (1) or dead (0). Each generation is computed from the previous one, with every c...

Software Engineering FundamentalsMemory Management
12
0
99 people solved
Oct 14, 2026
Databricks logo
Databricks
Medium
Software EngineerSenior+

Report the Winner After Every Move on an n x n Tic-Tac-Toe Board

Two players play tic-tac-toe on an n × n board, a generalization of the classic 3 × 3 game. Player 1 makes the first move and the players then alterna...

Coding & AlgorithmsSimulation & State Machines
23
1
174 people solved
Sep 18, 2026
Applied Intuition logo
Applied Intuition
Medium
Software Engineer

Implement an In-Memory Key-Value Store With BEGIN, COMMIT and ROLLBACK

Implement an in-memory key-value store that supports these commands: - SET key value: assign the value to the key, overwriting any existing value. - G...

Software Engineering FundamentalsData Structure DesignTransactions & Isolation
1
0
11 people solved
Nov 10, 2026
Robinhood logo
Robinhood
Medium
Software Engineer

Design a live and historical stock quote API fed by a redundant exchange trade feed

Design the market data API for a retail stock-trading app. Clients call two endpoints: - GET /quotes/{symbol}/live returns the real-time quote for one...

System DesignTrading SystemsCaching
19
0
159 people solved
Oct 2, 2026
Google logo
GoogleAmazonMeta

Also asked at Meta, Bloomberg, Microsoft, Expedia, Pinterest, LG Electronics, TCS, Zoho, Veeva Systems

Medium
Software Engineer

Generate the nth Run-Count Sequence Term

Problem A sequence of digit strings begins with "1". Construct each later term by describing the consecutive runs in the preceding term: - Split the p...

Coding & AlgorithmsArrays & StringsSimulation & State Machines
3
1
41 people solved
DoorDash logo
DoorDash
Medium
Software Engineer

Design a URL Shortening Service

Design a service that creates short links for destination URLs and redirects requests for those short links. Clarifying Questions The report supplies ...

System DesignSystem Design FundamentalsAPI Design
1
0
18 people solved
Oct 31, 2026
OpenAI logo
OpenAI
Hard
Machine Learning Engineer Locked

Vectorized 1-Nearest-Neighbor in NumPy and Its Equivalence to a Linear Layer

Implement a 1-nearest-neighbor classifier in NumPy using only vectorized operations, then show that finding the nearest training point is equivalent t...

Machine LearningML Coding
14
0
267 people solved
Sep 20, 2026
DoorDash logo
DoorDash
Easy
Machine Learning EngineerIntern

Build a Labeled Training Dataset from Messy Order and Store Tables with an AI Assistant

In a one-hour AI-assisted coding round for a machine learning role, you work in a HackerRank environment that gives you five small datasets about orde...

Data Manipulation (SQL/Python)Feature EngineeringData Cleaning & Wrangling
1
0
16 people solved
Nov 3, 2026
Applied Intuition logo
Applied Intuition
Hard
Software Engineer

Merge Overlapping Collinear Lane Segments Given as Integer Point Lists

Lane geometry is given as a list of straight lane segments. Each segment is a list of integer points [x, y] that all lie on one straight line, listed ...

Coding & AlgorithmsIntervals & SchedulingMath & Number Theory
8
0
161 people solved
Oct 8, 2026
Databricks logo
Databricks
Medium
Software EngineerNew Grad

Single-Machine Cache with WAL Persistence, Sharded Locks and LRU

A web service handles requests and needs a cache. Design a single-machine cache and write pseudocode for it. An in-memory map is enough for storage; i...

System DesignCachingConcurrency
36
0
303 people solved
Sep 11, 2026
Atlassian logo
Atlassian
Hard
Frontend EngineerSenior+

Build a 2x3 React Feed Grid from Static Data, Then from an API, and Explain Your Hooks

Build a small React view that shows a list of feed items, similar to posts in a social feed, in a fixed six-cell grid: two rows of three equal-width c...

Software Engineering FundamentalsReact & UI FrameworksCSS & Layout
5
0
104 people solved
Oct 3, 2026
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