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

"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

DoorDash

Medium

Data Scientist

Analyze Order Spending Patterns Across Cities Using SQL

Orders order_id | user_id | order_date | city | order_value 1 | 101 | 2023-01-03 | LA | 23.50 2 | 102 | 2023-01-04 | NY | 45.00 3 | 101 | 2023-01-10 |...

Data Manipulation (SQL/Python)

Identify Major Components of DoorDash's Operational Costs

DoorDash Operational Cost Structure and Optimization DoorDash leadership wants to understand the operational cost structure of a three-sided food-deli...

Analytics & ExperimentationBusiness Case AnalysisMetrics & KPIs

Compute letter frequencies from encoded string

Problem You are given an encoded string s representing a string of lowercase English letters (a–z). The encoding follows these rules: 1. Letters a to ...

Coding & AlgorithmsParsing & InterpretersArrays & Strings

Address Fraud Detection with Imbalance and Concept Drift Solutions

Address Fraud Detection with Imbalance and Concept Drift Solutions You are building a fraud-detection model for an online payments product that must s...

Merge two interval lists into a union

You are given two lists of closed intervals [start, end]. Each list is individually sorted by start and contains non-overlapping intervals. Merge the ...

Estimate percentile from buckets

You are given an approximate histogram of search-query frequencies. Each bucket i is represented as (left_bd_i, right_bd_i, bucket_count_i), where buc...

Data Scientist Locked

How do you sample uniformly from an infinite stream?

This question evaluates understanding of streaming algorithms, randomized sampling and probability, and algorithmic space–time trade-offs involved in ...

Coding & AlgorithmsProbabilityMath & Number Theory

Find right-side view of binary tree

You are given the root of a binary tree. From the right side of the tree, at each depth you can see exactly one node: the rightmost node at that depth...

Coding & AlgorithmsTrees

Program Execution Deep Dive

Program Execution Deep Dive Describe an end-to-end program or product you led as a Product Manager. The interviewer wants to understand how you captur...

Product / Decision Making

Compute duration and stopping rules correctly

Experiment Runtime Planning: Same‑Day Delivery Attach Rate You are planning an A/B test on the same‑day delivery attach rate (the proportion of eligib...

Analytics & ExperimentationExperiment Design (A/B Testing)Sequential & Adaptive Testing

Assess SQL joins, unions, windows, dedup, and pandas

Using the schema and sample data below, answer all sub-questions. Unless stated, assume ANSI SQL and explain any dialect-specific choices. Schema: - c...

Data Manipulation (SQL/Python)

Design an email flu-shot experiment

End-to-End Experiment Design: Email Campaign to Increase Verified Flu Vaccinations Context: You are designing a 30-day email campaign to increase veri...

Analytics & Experimentation

Identify and Fix Predictive Model Performance Gaps

Model Review: Month Encoding, Feature Scaling, and Imbalanced Data You are auditing an existing predictive model for operational performance. The curr...

Machine LearningSupervised LearningFeature Engineering

Solve BST range average and merge intervals

1) Given a binary search tree and an inclusive range [L, R], compute both the sum and the average of all node values where L <= val <= R. Use the BST ...

Prioritize a new warehouse proposal with data

Build vs. Lease vs. Defer: New Fulfillment Center Decision Context You are evaluating whether to open a new fulfillment center (FC) to improve deliver...

Analytics & ExperimentationBusiness Case AnalysisTime Series & Forecasting

Machine Learning Engineer

Design and train a PPO pipeline

End-to-End PPO Training: Describe Your Pipeline You are asked to explain, in concrete and reproducible terms, how you trained a policy with Proximal P...

Find buildings with rightward view

Find buildings with rightward view You are given an array of building heights aligned along a street that faces the ocean to the right. Return the ind...

Software EngineerIntern Locked

Kth Employee Reached in an Ordered Hierarchy

This tree-algorithms interview question evaluates practical understanding of ordered hierarchy traversal and repeated subtree selection queries. It is...

Coding & AlgorithmsTrees

Software Engineer Locked

Derive MLP shapes and explain PyTorch broadcasting

This question evaluates understanding of tensor shapes, linear layer forward computation, and deep-learning-framework broadcasting semantics. It is co...

Adjust YouTube Ad Scores Using Mixed-Effects Linear Regression

Adjusting YouTube Ad Scores with Mixed-effects Regression One hundred reviewers each rate the same 100 YouTube ads on a 1 to 10 scale. Some reviewers ...

Machine LearningRegression & Statistical Modeling

132 people solved

Jul 12, 2025

Tech Interview Questions

Analyze Order Spending Patterns Across Cities Using SQL

Identify Major Components of DoorDash's Operational Costs

Compute letter frequencies from encoded string

Address Fraud Detection with Imbalance and Concept Drift Solutions

Merge two interval lists into a union

Estimate percentile from buckets

How do you sample uniformly from an infinite stream?

Find right-side view of binary tree

Program Execution Deep Dive

Compute duration and stopping rules correctly

Assess SQL joins, unions, windows, dedup, and pandas

Design an email flu-shot experiment

Identify and Fix Predictive Model Performance Gaps

Solve BST range average and merge intervals

Prioritize a new warehouse proposal with data

Design and train a PPO pipeline

Find buildings with rightward view

Kth Employee Reached in an Ordered Hierarchy

Derive MLP shapes and explain PyTorch broadcasting

Adjust YouTube Ad Scores Using Mixed-Effects Linear Regression

Choose your next challenge

Blind 75

ML System Design

System Design Interview