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

Capital One

Easy

Data Scientist

Differentiate fixed and variable costs with examples

Unit Economics: Fixed vs. Variable Costs in a Subscription Streaming Business Task - Define fixed cost vs. variable cost for a subscription streaming ...

Software EngineerSenior+ Locked

Design O(1) Randomized Multiset

This question evaluates data-structure design skills, understanding of hashing and randomization for uniform sampling, handling of duplicate elements,...

Coding & AlgorithmsData Structure DesignArrays & Strings

Implement topological sort and tree boundary traversal

You are given two separate coding tasks. Problem A — Order courses with prerequisites You have n courses labeled 0..n-1 and a list of prerequisite pai...

Coding & AlgorithmsGraphsTrees

Software Engineer Locked

Process Calendar Events with Deletion, Pagination, and Overlap Queries

Practice implementing an in-memory calendar that supports inserts, deletions, stable ordering, zero-based pagination, and half-open interval overlap q...

Parse and build binary data in Python

Using provided interfaces ByteReader(read(n), read_uint32_le, read_string) and ByteWriter(write(b), write_uint32_le, write_string), implement function...

Data Manipulation (SQL/Python)Parsing & Interpreters

Compute ARPDAU/ARPPU by country

Using only the two tables below, write a single SQL query that returns, for each day and country in the last 7 days inclusive (2025-08-26 through 2025...

Data Manipulation (SQL/Python)

Deep-dive a recent project

Project Deep-Dive (Technical Screen: Behavioral & Leadership) Context You will be asked to walk through a recent project you owned end-to-end. Assume ...

Behavioral & LeadershipProject Deep DiveMetrics & KPIs

Software Engineer Locked

Design fast search for AV raw logs

This question evaluates a candidate's ability to design scalable logging and search infrastructure for autonomous-vehicle telemetry, testing skills in...

System DesignSearch & Feed SystemsStorage & Sharding

Implement Hook and Modify UI Interactions

Task: Implement a custom React hook and wire UI interactions Context You are working in a React app that already includes a basic API module and a sim...

Software Engineering FundamentalsReact & UI Frameworks

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

Design car rental schema and APIs

System Design: Car Rental Platform Design the backend for a car rental platform (think a regional chain like Hertz or Enterprise). The system lets cus...

System DesignSystem Design FundamentalsStorage & Sharding

Software EngineerSenior+ Locked

Design first-time Kubernetes deployment in new cloud

This question evaluates system design and cloud platform engineering skills focused on first‑time Kubernetes deployment, covering account bootstrappin...

System DesignContainers & OrchestrationCloud Platforms

Applied ScientistSenior+ Locked

Merge Overlapping Time Ranges

This question evaluates a candidate's ability to work with interval merging, a core array and sorting problem in technical interviews. It tests unders...

Data Scientist Locked

How validate a driving simulation is realistic?

This question evaluates skills in statistical validation of simulations, distributional comparison between real and simulated driving data, scenario-s...

Analytics & ExperimentationHypothesis Testing

Data ScientistIntern Locked

Managing a Research Project End to End

Explain how you take an ambiguous research question through planning, data validation, execution, review, and a decision-ready handoff with limitation...

Behavioral & Leadership

Data ScientistNew Grad

Evaluate shift from branch to digital channel

Business case: OneMain credit card — branch vs. digital acquisition OneMain runs a credit-card business with two acquisition/servicing flows: - Tradit...

Analytics & ExperimentationBusiness Case AnalysisGrowth & Monetization

Software Engineer AI Locked

Build an Expense Policy Rule Engine

This question evaluates implementing rule-evaluation logic, data modeling for expense records and rule representations, operator semantics, and design...

Coding & Algorithms

150 people solved

Apr 17, 2025

Design a Concurrent, Memory-Bounded Tally Service

Design a tally service that records timestamped events and answers inclusive range-count queries, beginning with an exact baseline and evolving toward...

Software Engineering FundamentalsData Structure DesignConcurrency

Machine Learning EngineerSenior+ Locked

Design a Drop-off Spot Selector

This question evaluates expertise in ML-driven system design for safety-critical autonomous vehicle decisions, covering real-time decision-making, geo...

Design an e-commerce recommendation system

Design an Amazon-Scale E‑Commerce Product Recommendation System Context You are designing a large-scale recommendation system that powers multiple use...

ML System DesignRecommendation SystemsFeature Engineering

180 people solved

Sep 6, 2025

Tech Interview Questions

Differentiate fixed and variable costs with examples

Design O(1) Randomized Multiset

Implement topological sort and tree boundary traversal

Process Calendar Events with Deletion, Pagination, and Overlap Queries

Parse and build binary data in Python

Compute ARPDAU/ARPPU by country

Deep-dive a recent project

Design fast search for AV raw logs

Implement Hook and Modify UI Interactions

Explain LLM post-training methods and tradeoffs

Design car rental schema and APIs

Design first-time Kubernetes deployment in new cloud

Merge Overlapping Time Ranges

How validate a driving simulation is realistic?

Managing a Research Project End to End

Evaluate shift from branch to digital channel

Build an Expense Policy Rule Engine

Design a Concurrent, Memory-Bounded Tally Service

Design a Drop-off Spot Selector

Design an e-commerce recommendation system

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Blind 75

ML System Design

System Design Interview