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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
LinkedIn logo
LinkedIn
Medium
Machine Learning EngineerSenior+

Transformer Complexity, Inference Optimization, GQA and FlashAttention

In a fundamentals round for a staff-level AI engineering role, the interviewer asked a series of core Transformer questions: the computational complex...

Machine LearningTransformers & AttentionLLM Inference & Serving
6
0
48 people solved
Oct 23, 2026
Optiver logo
Optiver
Medium
Software Engineer

Fastest 1000 Meters: Max Average Speed from 5-Second Distance Splits

A runner's workout is recorded as a list of integers distances, where distances[i] is the number of meters covered during the i-th consecutive 5-secon...

Coding & AlgorithmsTwo Pointers & Sliding Window
46
4
597 people solved
Sep 26, 2026
LinkedIn logo
LinkedIn
Medium
Software Engineer

Randomized String Multiset With Average O(1) Insert, Remove and Weighted Random Pick

Design a data structure that holds a collection of strings in which the same string may be stored several times, and that supports the following opera...

Software Engineering FundamentalsData Structure Design
14
1
153 people solved
Oct 16, 2026
Google logo
GoogleBloombergAmazon

Also asked at Amazon, Meta, PayPal, Zopsmart, Microsoft, Infosys, Zoho, Oracle, Salesforce, Walmart Labs, TCS, Apple, PayPay

Medium
Software Engineer

Read a Down-and-Up Character Layout by Row

Problem Convert the string text by placing its characters into rowCount rows. Start at the top row, travel down one row for each successive character,...

Coding & AlgorithmsArrays & StringsSimulation & State Machines
10
1
65 people solved
Databricks logo
Databricks
Medium
Software Engineer

Tic-Tac-Toe Game Logic With a Random-Move Computer Player

Implement the logic of a tic-tac-toe game. The focus is the game logic, not a user interface. Two players, X and O, take turns placing their mark on a...

Software Engineering FundamentalsSimulation & State MachinesLow-Level Design (OOP)
8
0
60 people solved
Oct 14, 2026
Goldman Sachs logo
Goldman Sachs
Medium
Software EngineerNew Grad

Rearrange an Array to Minimize the Sum of Distinct Counts over All Prefixes

You are given an integer array nums and may rearrange its elements into any order. For an arrangement a of length n, its cost is the sum, over every p...

Coding & AlgorithmsGreedySorting
7
0
65 people solved
Oct 14, 2026
GitHub logo
GitHub
Medium
Software EngineerSenior+

Build an In-Memory Query Engine over JSON Tables with WHERE and ORDER BY

Implement query functionality similar to a relational database over data given as a JSON dictionary. The report says only that the data is a JSON dict...

Software Engineering FundamentalsLow-Level Design (OOP)Database Internals
2
0
14 people solved
Nov 10, 2026
DoorDash logo
DoorDash
Medium
Machine Learning Engineer

Design a Food Ordering Chatbot With Dietary Guardrails and Budget Fine-Tuning

In a round focused on post-training and evaluation of large language models, design a customer-facing chatbot that lets customers of a food-delivery a...

ML System DesignLLM ApplicationsFine-Tuning & Alignment Techniques
1
0
14 people solved
Nov 10, 2026
Google logo
Google
Medium
Software EngineerIntern

Count Evenings Needed to Finish Whole Chapters in Order

A book has chapters with given reading durations in order. Each evening provides a time budget. You may begin a chapter only if you can finish it that...

Coding & AlgorithmsSimulation & State Machines
5
0
47 people solved
Oct 22, 2026
Medium
Software Engineer

Versioned Key-Value Store with Out-of-Order Writes, Snapshots and Read Freezing

You are building an in-memory key-value store that a distributed training job uses to checkpoint model metadata. Every key keeps a history of values, ...

Software Engineering FundamentalsData Structure DesignBinary Search
3
0
29 people solved
Oct 30, 2026
Anthropic logo
Anthropic
Medium
Software Engineer

Fair Coin from a Biased Coin, Uniform 1-to-n Sampler Bug, Monte Carlo with Threads

This coding exercise has four connected parts built on random number generation: a fair coin from an unfair one, a bug hunt in a sampler built on that...

Software Engineering FundamentalsMath & Number TheoryProbability
7
0
66 people solved
Oct 10, 2026
Pinterest logo
Pinterest
Medium
Machine Learning EngineerIntern

Implement Gaussian Naive Bayes Training and Prediction from Scratch

Implement a Gaussian Naive Bayes classifier from scratch, in plain Python or NumPy and without a machine learning library: training estimates per-clas...

Machine LearningML CodingSupervised Learning
6
0
60 people solved
Oct 14, 2026
Salesforce logo
Salesforce
Medium
Software EngineerSenior+

Implement a Rate Limiter for CI Jobs Rather Than for API Requests

In a technical screen built around your experience with cloud infrastructure, Terraform and CI/CD, the interviewer asks how you would implement a rate...

Software Engineering FundamentalsRate LimitingDistributed Coordination
2
0
34 people solved
Oct 23, 2026
Meta logo
Meta
Medium
Software EngineerSenior+

Maximum Character Coverage From Words With No Shared Letters

You are given a list of words and an alphabet. Choose a subset of the words such that no two chosen words share even one character. The coverage of a ...

Coding & AlgorithmsBacktracking & RecursionBit Manipulation
2
0
28 people solved
Nov 1, 2026
Rippling logo
Rippling
Medium
Software Engineer

Task Manager: Validated addTask and Filtered, Sorted printTasks With Child Tasks

Implement an in-memory task manager in Java with two operations, addTask and printTasks. In the reported version a task is a Java record with the fiel...

Software Engineering FundamentalsLow-Level Design (OOP)Sorting
3
0
25 people solved
Nov 2, 2026
DoorDash logo
DoorDash
Medium
Software Engineer

Compute Delivery Pay from an Event Stream and Peak Windows

A delivery worker's day is represented by events containing an order ID, worker ID, timestamp, and status such as accepted, fulfilled, or canceled. Pa...

Software Engineering FundamentalsIntervals & SchedulingAPI Integration & HTTP Clients
4
0
35 people solved
Oct 24, 2026
Amazon logo
Amazon
Medium
Software Engineer

Design an AI-Agent Security Detection Pipeline for 1 TB/Day of Streaming Telemetry

Design a system in which an AI agent works on a stream of security data and runs security detection on it. The incoming traffic is about 1 TB per day....

System DesignSystem Design FundamentalsBatch & Stream Processing
13
0
183 people solved
Oct 9, 2026
Databricks logo
Databricks
Medium
Software Engineer

Thread-Safe Durable Event Writer Shared by Thousands of Threads

Design a thread-safe, durable event writer used by a single application running on one server. Thousands of application threads share a single instanc...

System DesignConcurrencyOperating Systems
62
1
506 people solved
Sep 11, 2026
Applied Intuition logo
Applied Intuition
Medium
Software Engineer

Resolve Variable Assignments With Addition and Subtraction, Flagging Unresolvable Ones

You are given a list of assignment lines. Each line assigns to a variable either an integer or an expression that adds and subtracts integers and othe...

Coding & AlgorithmsGraphsParsing & Interpreters
0
0
18 people solved
Nov 10, 2026
Pinterest logo
Pinterest
Easy
Machine Learning EngineerIntern

Implement a k-Nearest Neighbors Classifier from Scratch

Implement a k-nearest neighbors (KNN) classifier from scratch, without a machine learning library. It was one of two from-scratch ML algorithm impleme...

Machine LearningML CodingSupervised Learning
9
0
61 people solved
Oct 14, 2026
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