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

"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_

"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"

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

"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."

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

"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."

CarlosFull Stack, Shopify

"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."

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."

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

"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."

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

"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."

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

"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."

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

_The_TaNk_

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

"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."

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

CarlosFull Stack, Shopify

"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."

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."

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

"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."

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

"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."

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

"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."

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

Databricks

Hard

Data Scientist

Test coin fairness from 560 tails in 1000 flips

You flip a coin n = 1000 times and observe 560 tails. At significance level α = 0.05, test whether the coin is fair. - State the null and alternative ...

Compute extinction probability in a branching process

Compute extinction probability in a branching process You start with 1 cell at time 0. Every minute, each existing cell independently transitions with...

Statistics & MathProbability

Analyze TSV File for User Page Visits and Patterns

visits +-----------+-----------+------+ | person_id | timestamp | page | +-----------+-----------+------+ | 1 | 100 | A | | 1 ...

Data Manipulation (SQL/Python)

Count ordered pairs that concatenate to target

Given a list of integers numbers and an integer target, count the number of ordered pairs (i, j) with i != j such that concatenating numbers[i] follow...

Coding & AlgorithmsArrays & Strings

Compute monthly new subscribers and YoY deltas

Write a single SQL query that returns monthly counts of new subscribers starting at 2019-06, plus year-over-year (same-month prior year) comparisons. ...

Data Manipulation (SQL/Python)

Software EngineerSenior+ Locked

Design an At-Most-Once Job Scheduler

This question evaluates a candidate's competency in distributed systems and system design, focusing on at-most-once execution semantics, fault toleran...

System DesignJob Scheduling & WorkflowsDistributed Transactions & Idempotency

How would you investigate a metric decline?

Scenario You are a Data Scientist supporting a consumer marketplace product. A key business metric (e.g., orders/day, conversion rate, revenue, profit...

Analytics & ExperimentationMetric DiagnosticsSegmentation & Cohort Analysis

Data Scientist Locked

Analyze time series and design validation experiment

This question evaluates competency in time series analysis, change-point detection, count-based forecasting, causal inference and experiment design, a...

Analytics & ExperimentationTime Series & ForecastingCausal Inference

Determine Whether a Word Transformation Exists

Given a beginWord, an endWord, and a list of valid words wordList, determine whether it is possible to transform beginWord into endWord. Rules: - Each...

Design cloud storage with quotas and compression

System Design: Multi‑Tenant Cloud Storage Service (Take‑Home) You are tasked with designing a multi‑tenant cloud storage service that supports file up...

System DesignFile & Media StorageAPI Design

Data Scientist Locked

Test if one value comes from N(μ,σ²)

Formulate a two-sided test of whether a single observed value comes from a normal distribution with known mean and standard deviation, giving the test...

Backend EngineerSenior+

Compute time to burn tree

Given the root of a binary tree and the value of a target node that starts burning at time 0, fire spreads every minute from a burning node to its lef...

Design a URL shortener: short-code generation, fast redirects and scaling

Design a URL shortening service. A user submits a long URL and receives a short link; anyone who opens the short link is redirected to the original UR...

System DesignSystem Design FundamentalsCaching

Build and Validate Passport Form UI

Passport Pattern Validation UI and Logic Context: Implement this in a vanilla HTML/CSS/JavaScript environment (single file, no frameworks). You are gi...

Software Engineering Fundamentals

Software Engineer Locked

Implement a debounce function

This question evaluates a candidate's ability to implement a debounce utility using runtime features such as closures, timers, and function-context pr...

Coding & AlgorithmsJavaScript & TypeScriptConcurrency

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

Compute maximum distinct-product pickup days

Question Given an array of positive integers representing quantities of different products, on day i (starting from 1) you must pick exactly i distinc...

Implement Trie search with wildcard matching

Design a text dictionary using a Trie. Support the following operations: - addWord(word): Insert a lowercase English word. - search(pattern): Return t...

Coding & AlgorithmsString Algorithms

Software Engineer Locked

Find max node-value range across components

This question evaluates understanding of undirected graph connectivity and component-wise aggregation, specifically the ability to identify connected ...

Software Engineer Locked

Design a bidirectional data sync dashboard

This question evaluates distributed system design skills focused on reliable bidirectional data synchronization, conflict resolution, event ingestion,...

System DesignDistributed Transactions & IdempotencyAPI Integration & HTTP Clients

129 people solved

Feb 9, 2026

Tech Interview Questions

Test coin fairness from 560 tails in 1000 flips

Compute extinction probability in a branching process

Analyze TSV File for User Page Visits and Patterns

Count ordered pairs that concatenate to target

Compute monthly new subscribers and YoY deltas

Design an At-Most-Once Job Scheduler

How would you investigate a metric decline?

Analyze time series and design validation experiment

Determine Whether a Word Transformation Exists

Design cloud storage with quotas and compression

Test if one value comes from N(μ,σ²)

Compute time to burn tree

Design a URL shortener: short-code generation, fast redirects and scaling

Build and Validate Passport Form UI

Implement a debounce function

Design an operations dashboard with justifications

Compute maximum distinct-product pickup days

Implement Trie search with wildcard matching

Find max node-value range across components

Design a bidirectional data sync dashboard

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ML System Design

System Design Interview