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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
Microsoft logo
Microsoft
Medium
Software EngineerSenior+

Design a replicated key-value store with quorums

Design a distributed system that replicates key–value pairs across multiple replicas. The interviewer wants to focus on replication, quorums, and fail...

System DesignKey-Value StoresConsensus & Replication
12
0
111 people solved
Dec 17, 2025
Flipster logo
Flipster
Easy
Software Engineer

Design 64-bit distributed IDs and a parking lot

You have two system-design prompts. 1) 64-bit database ID generator Design a service/library that generates globally unique 64-bit integer IDs for dat...

System Design
7
0
51 people solved
Feb 12, 2026
Lyft logo
Lyft
Easy
Data Scientist

Determine Probability of Single Ride on Following Day

Determine Probability of a Single Ride on the Following Day A pricing experiment gives each new rider two ride opportunities on day 1. For each offere...

Statistics & MathProbability
44
0
183 people solved
Jul 12, 2025
Google logo
Google
Medium
Software Engineer

Validate course catalog dependencies

Design a function to validate an e-learning course catalog. You are given: ( 1) a set of course IDs, and ( 2) a list of prerequisite pairs (u, v) mean...

Coding & AlgorithmsGraphs
8
0
128 people solved
Aug 1, 2025
DoorDash logo
DoorDash
Hard
Data Scientist

Explain why DoorDash and job change

Behavioral & Leadership (Onsite) — Data Scientist Context You are interviewing for a Data Scientist role focused on marketplace and operations. Use co...

Behavioral & LeadershipMotivation & FitAmbiguity & Decision Making
9
0
115 people solved
Oct 13, 2025
Google logo
Google
Medium
Software Engineer

Design at-least-once notification delivery

System Design: At-Least-Once Notification System Context Design a multi-channel notification platform (email, SMS, push, in-app) that guarantees at-le...

System DesignMessaging & Event-DrivenDistributed Transactions & Idempotency
17
0
156 people solved
Sep 6, 2025
Reddit logo
Reddit
Hard
Data Scientist

Justify synthetic control and handle inference

Synthetic Control: Assumptions, Estimation, Inference, and Diagnostics Context You are estimating the causal effect of an intervention on a single tre...

Statistics & MathCausal InferenceHypothesis Testing
14
0
205 people solved
Oct 13, 2025
PayPal logo
PayPal
Medium
Data Scientist

Optimize thresholds under fraud costs

Cost-sensitive Thresholding for Fraud (ATO) Classifier Context You are evaluating a binary classifier for account takeover (ATO) fraud on a large vali...

Statistics & Math
12
0
91 people solved
Oct 13, 2025
Shopify logo
Shopify
Medium
Product Manager

Validate Possibly Biased Cancellation-Reason Data and Present It to Leadership

You are a product manager at an e-commerce platform, and the current cancellation rate is x%. Customers who cancel choose a reason from a list, and th...

Analytics & ExperimentationExperiment Design (A/B Testing)Communication & Stakeholders
1
0
14 people solved
Apr 21, 2026
Spotify logo
Spotify
Medium
Product Manager

Leading Spotify's Market Launch in South Africa from Scratch

Spotify entered South Africa in 2018. Suppose it had not, and you are the product manager asked to lead Spotify's launch in that country. How would yo...

Product Design & StrategyRequirements & Launch ExecutionGrowth & Monetization
1
0
18 people solved
Oct 1, 2024
PayPal logo
PayPal
Medium
Data Scientist

Explain Window Functions and Joins in SQL and Python

TABLE transactions | transaction_id | user_id | merchant | amount | currency | transaction_ts | | 1001 | 17 | Walmart | 45.80...

Data Manipulation (SQL/Python)
3
0
34 people solved
Aug 4, 2025
Boston Consulting Group logo
Boston Consulting Group
Medium
Data Scientist

Explain AUC, activations, ensembles, and imbalance

Machine Learning Metrics and Modeling Choices — Multi-part You are given model scores and binary labels for a small dataset and asked to compute ROC A...

Machine LearningModel EvaluationML Fundamentals
20
0
142 people solved
Oct 13, 2025
DoorDash logo
DoorDash
Easy
Product Analyst Locked

Investigate LA successful orders drop

This question evaluates product and data analytics competencies including metric decomposition, causal inference, funnel analysis, and experimentation...

Analytics & ExperimentationMetric DiagnosticsExperiment Design (A/B Testing)
16
0
138 people solved
Feb 19, 2026
Microsoft logo
Microsoft
Easy
Data ScientistNew Grad

Explain KNN and PCA and key tradeoffs

In a Data Scientist internship interview, you are asked ML fundamentals: 1) K-Nearest Neighbors (KNN) - Explain how KNN works for classification and r...

Machine Learning
7
0
106 people solved
Nov 24, 2025
Meta logo
Meta
Medium
Software Engineer

Reverse between equal-value nodes in list

Given the head of a singly linked list and a target value v, locate the first two nodes whose values equal v (call them A and B, with A before B) and ...

Coding & Algorithms
7
0
67 people solved
Sep 6, 2025
Google logo
Google
Medium
Software EngineerNew Grad

Track Island Counts as Land Is Added

Track Island Counts as Land Is Added Problem Implement trackIslandCounts(grid, additions) -> counts. grid is a rectangular array containing 0 for wate...

Coding & Algorithms
8
0
67 people solved
Dec 8, 2025
DoorDash logo
DoorDash
Medium
Machine Learning Engineer Locked

Minimize batches and allocate riders by time

This question set evaluates algorithmic problem-solving in scheduling and resource allocation, assessing understanding of batching under capacity and ...

Coding & AlgorithmsIntervals & SchedulingGreedy
21
0
300 people solved
Feb 3, 2026
Otter.Ai logo
Otter.Ai
Medium
Data EngineerSenior+

Find Every Project with the Most Employees

The interview report explicitly identified the “Project with Most Employees” SQL exercise. Use the following self-contained PostgreSQL schema: `text e...

Data Manipulation (SQL/Python)
3
0
46 people solved
Apr 2, 2026
Figureai logo
Figureai
Medium
Data EngineerSenior+ Locked

Build a Firmware Data Quality and Release-Feedback Framework

Design a firmware telemetry quality framework that brings data and firmware teams together around versioned contracts, pre-release tests, canary check...

System Design
3
0
31 people solved
May 20, 2026
Medium
Software Engineer

Distinguish Checked and Unchecked Exceptions in Java

What is the difference between checked and unchecked exceptions in Java? Give examples and explain what the distinction requires at a method boundary....

Software Engineering FundamentalsProgramming Languages
0
0
5 people solved
Jan 14, 2026
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