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Tech Interview Questions

Practice the exact questions companies are asking right now.

Questions
12.1k
Companies
579
Updated
10.10.2026
12.1k Questions 579 Companies10.10.2026
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
ByteDance logo
ByteDance
Medium
Data Scientist

How would you choose a classification threshold?

You trained a binary classifier that outputs a probability score p(y=1|x). You must choose a decision threshold t to convert probabilities into class ...

Machine Learning
10
0
73 people solved
Nov 12, 2025
Block (Square) logo
Block (Square)
Medium
Data Scientist

Write left-join queries with tricky filters

Assume 'today' = '2025-09-01'. Do NOT use window functions (e.g., RANK). Use LEFT JOIN, COUNT(DISTINCT), GROUP BY, HAVING as appropriate. Schema: - us...

Data Manipulation (SQL/Python)SQL
6
0
99 people solved
Oct 13, 2025
Salesforce logo
Salesforce
Medium
Software Engineer

Explain background and Salesforce motivation

Explain background and Salesforce motivation Behavioral: Background, Motivation, and Team Fit (Salesforce, GCP-Focused) Prompt Provide a concise, stru...

Behavioral & LeadershipMotivation & FitProject Deep Dive
17
0
130 people solved
Jul 31, 2025
Meta logo
Meta
Medium
Data Engineer

Define success metrics for a social feed

Define Success Metrics for a Social Feed Feature You are evaluating a change to the main social feed in a large-scale consumer app. Assume events are ...

Analytics & Experimentation
10
0
83 people solved
Sep 6, 2025
Yahoo logo
Yahoo
Medium
Data Scientist

Calculate Total Spend and Identify Key User Metrics

Transactions +----+---------+--------+------------+ | id | user_id | amount | date | +----+---------+--------+------------+ | 1 | 101 | 23....

Data Manipulation (SQL/Python)
70
0
28 people solved
Jul 12, 2025
Meta logo
Meta
Medium
Software Engineer

Design a ticket or hotel reservation system

Design a reservation system (Ticketmaster-style event seats or hotel rooms). Requirements: - Users search availability by date/event. - Users select s...

System Design
3
0
55 people solved
Feb 25, 2026
Tools For Humanity logo
Tools For Humanity
Easy
Data Scientist

Compute reply-based engagement metrics

You work on a microblogging app (Twitter-like). Posts and replies are stored in the tables below. Tables all_post - post_id BIGINT PK - post_author_id...

Data Manipulation (SQL/Python)SQLMetrics & KPIs
4
0
59 people solved
Aug 29, 2025
Visa logo
Visa
Medium
Data Scientist

Compute Total Spent in 2023 Excluding Refunds

transactions +----------------+---------+-------------+--------+------------------+ | transaction_id | user_id | merchant_id | amount | transaction_da...

Data Manipulation (SQL/Python)
2
0
34 people solved
Aug 4, 2025
OpenAI logo
OpenAI
Hard
Software Engineer

Design a multi-tenant Slack-like messenger

System Design: Multi‑Tenant B2B Team Messaging (Slack‑like) Design a multi‑tenant, enterprise‑grade team messaging platform similar to Slack. Function...

System DesignReal-Time SystemsSystem Design Fundamentals
10
0
202 people solved
Sep 6, 2025
Moloco logo
Moloco
Hard
Software Engineer

Find single element when others repeat k times

You are given a sorted array of integers nums in non-decreasing order, and an integer k ≥ 2. Every value in nums appears exactly k times in a row, exc...

Coding & Algorithms
9
0
66 people solved
Nov 9, 2025
Capital One logo
Capital One
Medium
Data Scientist

Compute optimal stopping in a die-rolling game

Optimal stopping with a fair die (3-roll horizon) You observe outcomes of fair six-sided die rolls (faces 1–6) and may stop after any roll to take the...

Statistics & MathPuzzles & BrainteasersProbability
10
0
190 people solved
Oct 13, 2025
Circle logo
Circle
Hard
Software Engineer

Design flight-price search service

Design flight-price search service System Design: Cheapest Flight Search Across Multiple Providers Context Design a backend system that searches multi...

System DesignSearch & Feed SystemsCaching
26
0
250 people solved
Jul 17, 2025
HubSpot logo
HubSpot
Hard
Software Engineer

Design a near-real-time weather API

Question Design a weather data platform that retrieves best-effort hourly dumps from an external Weather Service API for approximately 2,000 locations...

System DesignSystem Design FundamentalsCaching
21
0
261 people solved
Sep 6, 2025
BlackRock logo
BlackRock
Easy
Software Engineer

Evaluate a verbal reasoning passage

True/False/Cannot Say – Reading Comprehension Instructions Read the passage and label each statement as True, False, or Cannot Say based only on the p...

Statistics & Math
8
0
99 people solved
Sep 6, 2025
Microsoft logo
Microsoft
Medium
Software Engineer Locked

Find the Best Connected Strength for Every Tree Node

For every node in a tree of strong and weak neurons weighted +1 and -1, find the best connected nonempty vertex set containing that node. A linear-tim...

Coding & Algorithms
2
0
30 people solved
May 20, 2026
TikTok logo
TikTok
Medium
Software Engineer Locked

Solve two grid problems (islands + min-cost path)

This pair of problems evaluates grid-based algorithm competencies, specifically connected-component detection and translation-invariant shape recognit...

Coding & AlgorithmsGrids & Matrices
13
0
124 people solved
Jan 22, 2026
OpenAI logo
OpenAI
Hard
Software Engineer

Design an online ads serving system

System Design: Low-Latency Targeted Ad Serving (≤100 ms E2E) You are designing an online advertising serving system for web/app inventory with a stric...

System DesignAds SystemsSystem Design Fundamentals
40
0
329 people solved
Sep 6, 2025
Capital One logo
Capital One
Medium
Data Scientist

Write one SQL for exam scores aggregation

You are given an exam database. Write a single SQL statement (CTEs allowed; one final statement only) that satisfies all three requirements below. You...

Data Manipulation (SQL/Python)
5
0
47 people solved
Oct 13, 2025
Amazon logo
Amazon
Hard
Data Scientist

Design an operations dashboard with justifications

Design an Operations Dashboard for Same-Day Delivery Station Performance Goal Create a real-time dashboard for a delivery-station manager to monitor a...

Analytics & Experimentation
8
0
62 people solved
Oct 13, 2025
ByteDance logo
ByteDance
Medium
Software Engineer Locked

Build a Binary Tree from Descriptions

Construct a binary tree from parent-child-side descriptions and return its root, following the cited tree-construction problem.

Coding & Algorithms
1
0
17 people solved
Aug 28, 2026
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