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

Square

Medium

Software EngineerSenior+

Build a Trust-Aware BIN Database

Build a Trust-Aware BIN Database Implement process_bin_operations(operations) for an in-memory database of card-number prefixes. A prefix identifies a...

Software Engineer Locked

Merge Overlapping Intervals

Merge an unsorted collection of closed integer intervals into a deterministic, non-overlapping union. Explain shared-endpoint behavior, duplicates, co...

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...

Count integer pairs satisfying 1/x + 1/y = 1/N

You are given a positive integer N ($1 \le N \le 10^6$). Consider the Diophantine equation: \[ \frac{1}{x} + \frac{1}{y} = \frac{1}{N}, \] where x a...

Compute early signals for user retention

You are given two tables that track signups and user transactions. Tables users - user_id (STRING, PK) — unique user - signup_ts (TIMESTAMP) — time th...

Data Manipulation (SQL/Python)SQLSegmentation & Cohort Analysis

Data Scientist Locked

Define and critique a user activity metric

This question evaluates a candidate's ability to design and critique user-activity metrics, covering event-level instrumentation, metric validity, and...

Analytics & ExperimentationMetrics & KPIsUser Behavior & Funnels

Data Scientist Locked

Analyze A/B test with rigorous diagnostics

This question evaluates a data scientist's competency in experimental design and rigorous A/B test analysis, including covariate balance checks, prima...

Analytics & ExperimentationExperiment Analysis & ReadoutCausal Inference

Infer causal impact without an A/B test

Evaluate Impact of a Shipped Version on Disconnections (No A/B Holdout) Context A new client version was shipped system-wide with the goal of reducing...

Statistics & MathCausal InferenceHypothesis Testing

Design elevator scheduling for small building

Design elevator scheduling for small building Design the control policy for a single elevator serving a small building: 3 floors plus 1 basement (stop...

System DesignSimulation & State MachinesSystem Design Fundamentals

Write rolling-window SQL over weekly cohorts

You have two tables: users and transactions. Write a single SQL query (use CTEs) to produce, for each calendar week and user, weekly_revenue, a 4-week...

Data Manipulation (SQL/Python)

Variance of an Equal-Weight Portfolio with Uncorrelated and Equicorrelated Assets

A portfolio holds n assets. The return of every asset has variance 1, and the portfolio is equally weighted, with weight 1/n on each asset. Find the v...

Statistics & MathPortfolio Construction & Alpha ResearchProbability

Determine Maximum Consecutive Order Days Per User

Determine Maximum Consecutive Order Days Per User orders +----+---------+------------+ | id | user_id | order_date | +----+---------+------------+ | ...

Data Manipulation (SQL/Python)SQL

Software Engineer Locked

Summarize Transcript Events in a Sliding Window

Implement rolling summaries over arrival-ordered transcript events. After each event, report the maximum transcript length and number of distinct user...

Explain Role Fit, Conflict Resolution, and Learning

Explain Role Fit, Conflict Resolution, and Learning Prepare concise answers for a recruiter and hiring-manager conversation. Use only real experience ...

Behavioral & Leadership

Design a fullstack app with frontend focus

Design a fullstack app with frontend focus Design a Full‑Stack Web Application (Frontend Emphasis) Context You are given a 2–3 page requirements docum...

System DesignReact & UI FrameworksAPI Design

Implement PyTorch training loop

Implement a basic PyTorch training loop You are given a PyTorch neural network model, a DataLoader that yields (inputs, targets) batches, an optimizer...

Coding & AlgorithmsML CodingNeural Networks & Training

Discuss Python mutability, copying, and GIL

In Python, explain the differences between mutable and immutable objects and illustrate how they affect function arguments and container behavior. Des...

Data Manipulation (SQL/Python)Programming LanguagesConcurrency

Design metrics and write SQL for a case

Case: Measure the impact of outreach on subsequent purchases and diagnose anomalies. Define your primary metric and write SQL. Schema and tiny samples...

Data Manipulation (SQL/Python)

Solve BFS and grid tasks

The coding rounds included several algorithmic problems: 1. Threshold search with binary search: You are given floors 1..n and an API canOperate(floor...

Coding & AlgorithmsGraphsBinary Search

Compute the Eddington number from ride distances

Given a list of positive integers distances, where distances[i] is the distance traveled on day i, compute the cyclist’s Eddington number E: E is the ...

Coding & Algorithms

54 people solved

Feb 26, 2026

Tech Interview Questions

Build a Trust-Aware BIN Database

Merge Overlapping Intervals

Find the Most Common Visit Pattern

Count integer pairs satisfying 1/x + 1/y = 1/N

Compute early signals for user retention

Define and critique a user activity metric

Analyze A/B test with rigorous diagnostics

Infer causal impact without an A/B test

Design elevator scheduling for small building

Write rolling-window SQL over weekly cohorts

Variance of an Equal-Weight Portfolio with Uncorrelated and Equicorrelated Assets

Determine Maximum Consecutive Order Days Per User

Summarize Transcript Events in a Sliding Window

Explain Role Fit, Conflict Resolution, and Learning

Design a fullstack app with frontend focus

Implement PyTorch training loop

Discuss Python mutability, copying, and GIL

Design metrics and write SQL for a case

Solve BFS and grid tasks

Compute the Eddington number from ride distances

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