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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
NVIDIA logo
NVIDIA
Hard
Software Engineer

Design a distributed multi-user counter

Design a Horizontally Scalable Distributed Counter Service Context You are designing a distributed counter service used concurrently by many clients. ...

System DesignDistributed CoordinationConsistency & Availability
9
0
139 people solved
Sep 6, 2025
Pinterest logo
Pinterest
Medium
Data Scientist

Clean and Aggregate Transactions for Finance Dashboard

transactions id | user_id | amount | timestamp | category 1 | 1001 | 19.99 | 2023-01-01 09:00:00 | grocery 2 | 1001 | 5.50 | 2023...

Data Manipulation (SQL/Python)
80
0
30 people solved
Jul 12, 2025
Citadel logo
Citadel
Medium
Data Scientist

Derive lower bound for equicorrelation rho

Equicorrelation Matrix PSD Condition Setup Consider zero-mean, unit-variance random variables whose pairwise correlations are all equal to a common va...

Statistics & MathProbability
18
0
148 people solved
Oct 13, 2025
Datadog logo
Datadog
Medium
Software Engineer

Implement write with internal buffer

Implement a buffered writer over an expensive sink API. You are given a function writeToDevice(byte[] chunk) that may accept at most M bytes per call ...

Coding & Algorithms
5
0
81 people solved
Sep 6, 2025
xAI logo
xAI
Medium
Software Engineer

Explain strings, moves, and concurrency

Question What is a string in programming languages? What fields are stored in a typical struct string and how would you implement one yourself? What i...

Coding & Algorithms
27
0
94 people solved
Jul 29, 2025
Scale AI logo
Scale AI
Easy
Machine Learning Engineer Locked

Explain LLM post-training methods and tradeoffs

This question evaluates a practitioner's knowledge of LLM post-training methods—including supervised fine-tuning, preference optimization approaches (...

Machine LearningFine-Tuning & Alignment TechniquesAI Safety & Alignment
42
0
405 people solved
Feb 12, 2026
Grammarly logo
Grammarly
Medium
Software Engineer

Design a collaborative spreadsheet

Design an online spreadsheet service similar to Google Sheets. Users can open the same workbook concurrently and directly edit cells, formulas, rows, ...

System DesignReal-Time SystemsAPI Design
11
0
186 people solved
Feb 13, 2026
CVS Health logo
CVS Health
Medium
Data Scientist

Write SQL for dedup and purchase shares

You are given two tables with intentional duplicates. Write SQL to: (a) identify duplicate user_ids and produce a canonical, deduplicated users set; (...

Data Manipulation (SQL/Python)
3
0
31 people solved
Oct 13, 2025
Databricks logo
Databricks
Medium
Software Engineer Locked

Compute 5-minute rolling average load

This question evaluates understanding of sliding-window aggregation and efficient data-structure design for time-series event streams, focusing on com...

Coding & AlgorithmsData Structure DesignTwo Pointers & Sliding Window
11
0
214 people solved
Feb 3, 2026
ByteDance logo
ByteDance
Medium
Site Reliability Engineer Locked

How would you troubleshoot Linux services?

This question evaluates proficiency in Linux system administration and site reliability engineering tasks—specifically troubleshooting disk-full condi...

Software Engineering FundamentalsReliability & SREOperating Systems
14
0
101 people solved
Jan 22, 2026
Google logo
Google
Easy
Data ScientistSenior+

Explain mixed models and fixed vs random effects

In an applied DS setting, you are modeling an outcome (e.g., watch time per session, conversion, or rating) across multiple entities (e.g., users, cre...

Statistics & MathRegression & Statistical Modeling
18
0
129 people solved
Oct 13, 2025
Luma AI logo
Luma AI
Hard
Software Engineer Locked

Implement Refactoring Assessment Features

This question evaluates proficiency in implementing spec-driven algorithms and data structures in Java, covering route reconstruction (directed graph/...

Coding & Algorithms
2
0
25 people solved
May 25, 2026
Meta logo
Meta
Medium
Backend Engineer Locked

Design an Instagram-like platform

This question evaluates proficiency in scalable backend architecture, distributed systems, data modeling, media storage and processing, API design, fe...

System Design
7
0
89 people solved
Apr 8, 2026
Point72 logo
Point72
Medium
Quantitative Researcher

Explain Encapsulation, Inheritance, and Polymorphism in C++

Explain Encapsulation, Inheritance, and Polymorphism in C++ Explain encapsulation, inheritance, and polymorphism in C++ by designing a small hierarchy...

Software Engineering Fundamentals
5
0
37 people solved
Dec 14, 2025
Google logo
Google
Medium
Data Scientist

Find most co‑purchased product pairs in SQL

Given the schema and sample data below, write ANSI-SQL to return the top 5 unordered product pairs most frequently purchased together across distinct ...

Data Manipulation (SQL/Python)SQLIndexing & Query Performance
25
1
176 people solved
Oct 13, 2025
SIG (Susquehanna) logo
SIG (Susquehanna)
Medium
Data Scientist Locked

Compute bus-on-time and dice-sum probabilities

This question evaluates understanding of probability concepts including a continuous uniform waiting-time model for bus arrivals and discrete outcome ...

Coding & Algorithms
11
0
88 people solved
Jan 22, 2026
Meta logo
Meta
Medium
Machine Learning Engineer

Design Place Recommendation System

Design a machine learning system for a maps or local-discovery product that recommends places a user may want to visit. The system should provide pers...

ML System DesignRecommendation SystemsRanking Models
12
0
223 people solved
Mar 17, 2026
Meta logo
Meta
Medium
Software EngineerSenior+ AI

Build a FastAPI summarization service

Implement a minimal but production-ready FastAPI service for text summarization. Requirements: - Expose an endpoint POST /summarize. - The request bod...

Coding & Algorithms
8
0
80 people solved
Jan 19, 2026
Amazon logo
Amazon
Hard
Software Engineer Locked

Find the Most Common Visit Pattern

This question evaluates the ability to process timestamped event logs and extract ordered length-3 visit sequences, testing skills in sorting, frequen...

Coding & Algorithms
4
0
39 people solved
May 23, 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
42
0
166 people solved
Jul 12, 2025
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