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

Medium

Data Scientist

Explain Shell Script for Python Virtual Environment Setup

Explain Shell Script for Python Virtual Environment Setup Scenario Shell script for setting up a Python virtual environment during a tech screen Quest...

Find top video category by average time

You are given a pandas DataFrame 'pins' with columns [pin_id:int, category_id:int, time_spent_sec:float, pin_format:string] and a dict 'category_map' ...

Data Manipulation (SQL/Python)

Software Engineer Locked

Minimum Movement Cost to Segregate Binary Digits

Given a binary string, repeatedly move a 1 to the right across adjacent 0 characters until all zeros precede all ones. Work through the function contr...

Software EngineerSenior+ Locked

Enumerate Right-and-Down Paths Through a Binary Matrix

Enumerate every valid top-left-to-bottom-right path through a small binary matrix using only right and down moves. Return move strings in lexicographi...

Review checkout code for defects and privacy

You are reviewing a supermarket checkout implementation. Identify and prioritize issues and fixes across: (a) monetary correctness (avoid floating poi...

Coding & AlgorithmsCode Quality & MaintainabilityApplication Security

Software EngineerIntern

Describe complex projects, failures, and pivots

In a software engineering internship interview, you may be asked a set of behavioral questions about project complexity, decision-making, failure, and...

Behavioral & LeadershipFailure & Learning

Implement minimal RLE encode/decode with max run K

You are given a run-length encoding (RLE) format that compresses a string by grouping consecutive repetitions of a short substring. Encoding format An...

Design a Payment Fraud Detection Service

Design a real-time fraud detection service for a payment platform. When a user submits a payment attempt, the platform calls your service before autho...

System DesignSystem Design FundamentalsPayments & Ledgers

114 people solved

Apr 14, 2026

Design an ad click aggregation service

Design a backend service that ingests ad impression and click events and provides aggregated metrics. Requirements: - Ingest a high-volume stream of e...

Data ScientistNew Grad Locked

Design Uber Eats Restaurant Recommendations

This question evaluates a candidate's ability in end-to-end machine learning system design for personalized restaurant recommendations in a food-deliv...

ML System DesignRecommendation SystemsRanking Models

Design a scalable food news feed

Question Design a news-feed feature for a food discovery app (DoorDash-style). The feed lists items showing title, author, short summary, and engageme...

System DesignSearch & Feed SystemsCaching

Implement lazy unique-merge generator for sorted streams

Write a Python generator merge_unique(a, b) that lazily merges two nondecreasing iterables a and b (potentially infinite) into a single nondecreasing ...

Coding & AlgorithmsArrays & StringsTesting & Quality

Machine Learning Engineer Locked

Explain Core ML Concepts

This question evaluates understanding of core supervised learning concepts—comparing linear and logistic regression, interpreting the bias–variance tr...

Machine LearningML FundamentalsRegression & Statistical Modeling

Group movies via graph traversal

You are given n movies labeled 0..n-1 and a list of undirected pairs (a, b) meaning movies a and b are similar. Group all movies into categories where...

Coding & AlgorithmsGraphs

Update No-Intercept Regression Slopes Across Batches

Data arrives in M batches. Each x_batches[b] and y_batches[b] is a matrix with the same number N of columns and the same number of rows within batch b...

Applied ScientistSenior+

Explain Collaborative Filtering Approaches

Collaborative Filtering for Recommendations: Approaches, Losses, Regularization, Cold Start, Bias, Evaluation, and Scale Context You are designing a r...

Machine LearningRecommendation SystemsModel Evaluation

Machine Learning Engineer Locked

Answer ML fundamentals and diagnostics questions

This question evaluates proficiency with confusion-matrix metrics (recall and false positive rate), ensemble learning trade-offs, decision-tree split/...

Machine LearningML FundamentalsModel Evaluation

Implement a min-heap column allocator

You are given an integer k (number of columns) and an array posts of positive integers where posts[i] is the height of the i-th post. All columns star...

Coding & AlgorithmsHeaps & Priority QueuesData Structure Design

Machine Learning Engineer

Answer conflict, failure, and proud project questions

Behavioral questions Answer the following behavioral prompts using real examples from your experience: 1. Conflict: Tell me about a time you had a con...

Behavioral & LeadershipConflict & CollaborationFailure & Learning

Compute p-values, probabilities, and regularization choices

Answer all parts. A) Hand‑compute a two‑sided p‑value comparing two means using Welch’s t‑test. Sample A: n1=20, mean1=5.2, sd1=1.1. Sample B: n2=24, ...

Statistics & MathHypothesis TestingProbability

216 people solved

Oct 13, 2025

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Tech Interview Questions

Explain Shell Script for Python Virtual Environment Setup

Find top video category by average time

Minimum Movement Cost to Segregate Binary Digits

Enumerate Right-and-Down Paths Through a Binary Matrix

Review checkout code for defects and privacy

Describe complex projects, failures, and pivots

Implement minimal RLE encode/decode with max run K

Design a Payment Fraud Detection Service

Design an ad click aggregation service

Design Uber Eats Restaurant Recommendations

Design a scalable food news feed

Implement lazy unique-merge generator for sorted streams

Explain Core ML Concepts

Group movies via graph traversal

Update No-Intercept Regression Slopes Across Batches

Explain Collaborative Filtering Approaches

Answer ML fundamentals and diagnostics questions

Implement a min-heap column allocator

Answer conflict, failure, and proud project questions

Compute p-values, probabilities, and regularization choices

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Blind 75

ML System Design

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