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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
Datadog logo
Datadog
Hard
Machine Learning Engineer Locked

Implement Focal Loss for Class-Imbalanced Classification

This question evaluates a candidate's ability to implement a specialized loss function for class-imbalanced classification from basic tensor operation...

Machine Learning
8
0
93 people solved
Jun 25, 2026
Citadel logo
Citadel
Medium
Software Engineer

Optimize password transform and discount scheduling

Optimize password transform and discount scheduling Part 1 — Transform to palindromic k-periodic string: Input: a lowercase string currentPassword and...

Coding & AlgorithmsArrays & StringsIntervals & Scheduling
21
0
189 people solved
Aug 1, 2025
ByteDance logo
ByteDance
Medium
Data Scientist

Probability That One Fair Die Beats Another

Probability That One Fair Die Beats Another Two fair dice, A and B, are represented by integer arrays. Each array element is one physical face, so dup...

Coding & Algorithms
2
0
27 people solved
Apr 4, 2026
Pinterest logo
Pinterest
Hard
Data Scientist

Recover causal effect without a control group

Post-hoc Causal Estimation After a Failed A/B Rollout Context An intern accidentally shipped a feature to 100% of eligible users for 5 consecutive day...

Analytics & ExperimentationCausal InferenceExperiment Analysis & Readout
24
0
154 people solved
Oct 13, 2025
Amazon logo
Amazon
Medium
Software Engineer

Longest Divisible Subarray with One Optional Sign Flip

Longest Divisible Subarray with One Optional Sign Flip You are given an integer array nums and a positive integer k. A nonempty contiguous subarray is...

Coding & AlgorithmsArrays & StringsMath & Number Theory
0
0
4 people solved
Upstart logo
Upstart
Medium
Data Scientist

Solve core probability/statistics mini-problems

Answer the following probability/statistics interview questions. Assume all randomness is independent unless stated otherwise. 1) Radioactive decay (h...

Statistics & MathProbabilityPuzzles & Brainteasers
20
0
141 people solved
Nov 29, 2025
Amazon logo
AmazonPinterestGoogle

Also asked at Google, Meta, Microsoft, Bloomberg, Myntra, Nuro, ServiceNow

Medium
Software Engineer

Count expressions reaching a target sum

Count expressions reaching a target sum Given an array of non-negative integers nums and an integer target T, assign either a + or − sign to each numb...

Coding & AlgorithmsDynamic ProgrammingBacktracking & Recursion
5
0
98 people solved
Google logo
GoogleAmazonBloomberg

Also asked at Bloomberg, Meta, Oracle, Microsoft, LinkedIn, Infosys, Flipkart, ByteDance, Uber

Hard
Software Engineer

Delete a Node From a Search Tree

Given the root of a binary search tree and an integer key, delete the node whose value equals key if it exists. Return the possibly new root while pre...

Coding & Algorithms
18
1
122 people solved
Decagon logo
Decagon
Medium
Software Engineer Locked

Design a Real-Time AI Voice System

This question evaluates system-level engineering skills for real-time conversational AI, covering audio ingestion, speech recognition, dialogue orches...

ML System DesignReal-Time SystemsLLM Applications
36
0
264 people solved
Feb 17, 2026
Shopify logo
Shopify
Medium
Product Manager

Linking a Shopify App's Support Team to Retention and Growth, Plus a Turnaround Plan

You are the product manager for an app that merchants install from the Shopify App Store, and the app already has a customer care team. Leadership wan...

Analytics & ExperimentationMetrics & KPIsCausal Inference
1
0
14 people solved
Apr 30, 2026
Coinbase logo
Coinbase
Medium
Software Engineer

Implement banking ops: transfer, top-k, cashback, merge

Design and implement an in-memory banking system that supports: ( 1) CreateAccount(id, initialBalance) and Transfer(fromId, toId, amount) with validat...

Coding & AlgorithmsLow-Level Design (OOP)Distributed Transactions & Idempotency
22
0
193 people solved
Sep 6, 2025
NVIDIA logo
NVIDIA
Easy
Software Engineer

Compare arrays, linked lists, hash tables, trees

Answer the following computer-science fundamentals questions: 1) What are the time complexities (Big-O) of common sorting algorithms (e.g., bubble sor...

Software Engineering FundamentalsSorting
17
0
219 people solved
Feb 6, 2026
Adobe logo
Adobe
Hard
Machine Learning Engineer Locked

Explain Transformer Attention Fundamentals

This question evaluates understanding of Transformer architectures and LLM training fundamentals, specifically attention mechanics, attention masking ...

Machine LearningTransformers & AttentionLLM Inference & Serving
16
0
113 people solved
May 19, 2026
LinkedIn logo
LinkedIn
Medium
Data Scientist Locked

Explain variance reduction in random forests

This question evaluates understanding of variance reduction in ensemble methods, the impact of inter-tree correlation on averaged predictors, and the ...

Machine LearningML FundamentalsSupervised Learning
15
0
102 people solved
Feb 19, 2026
Amazon logo
AmazonGoogleMicrosoft

Also asked at Microsoft, Deshaw, Meta

Hard
Software Engineer

Minimize the Cost of Merging Exactly K Adjacent Piles at a Time

Problem Piles in stones remain in row order. Each move merges exactly k consecutive current piles into one and costs their combined stone count. Retur...

Coding & AlgorithmsDynamic Programming
0
0
7 people solved
Park+ logo
Park+
Medium
Product Manager

Market Sizing Case: Estimating Delhi's Installed Base of Television Sets

In a product manager interview, you are asked how many televisions there are in Delhi. Talk the interviewer through how you would reach a number. Stat...

Product / Decision MakingEstimation & Market Sizing
1
0
8 people solved
May 27, 2026
Google logo
GoogleAmazonMeta

Also asked at Meta, Microsoft, Bloomberg

Hard
Software Engineer

Largest Sum of a BST Rooted Subtree

Problem Among rooted subtrees of the native binary tree, find the largest sum whose entire subtree is a strict binary search tree. Every left descenda...

Coding & AlgorithmsTreesDynamic Programming
0
0
8 people solved
Pinterest logo
Pinterest
Medium
Software Engineer Locked

Solve Two Grid Search Problems

This question evaluates proficiency in graph traversal on grids, specifically competencies in identifying connected components and modeling propagatio...

Coding & AlgorithmsGrids & Matrices
24
0
156 people solved
Jan 28, 2026
xAI logo
xAI
Medium
Software Engineer

Design a Rate Limiter with Per-User Token Quotas

Design a Rate Limiter with Per-User Token Quotas Design a distributed rate limiter for a high-traffic API platform, with one twist that drives the who...

System Design
9
0
92 people solved
Sep 23, 2025
Wayfair logo
Wayfair
Easy
Data Scientist Locked

Clean scores and return top 5 students

This question evaluates proficiency in data cleaning and transformation for Data Science, focusing on handling missing values, median imputation, and ...

Data Manipulation (SQL/Python)Pandas & Python DataData Cleaning & Wrangling
6
0
96 people solved
Feb 18, 2026
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