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

DoorDash

Hard

Analytics Engineer

Walk Through an ETL Project

For an Analytics Engineer interview, walk through an ETL project you built end to end. Describe the business goal, source systems, ingestion pattern, ...

Behavioral & Leadership

Walk through an A/B test end-to-end

Walk through how you would design, run, and analyze an A/B test for a product change. Your answer should include: - Hypothesis framing and choosing pr...

Analytics & ExperimentationExperiment Design (A/B Testing)Hypothesis Testing

113 people solved

Oct 11, 2025

Design a feed ads A/B test with guardrails

Experiment Design: Insert One Extra Ad Every 8 Organic Posts in Main Feed Context You want to increase ad load by inserting one additional ad for ever...

Analytics & Experimentation

Find minimal property set in neighborhood

You are given a list of properties, each Property(id: int, neighborhood: string, capacity: int). Given a targetNeighborhood (string) and groupSize (in...

Coding & AlgorithmsGreedy

Thread Safety, Deadlock Prevention, and Arrays vs Linked Lists

In a rapid-fire concepts segment of a software engineering interview, the interviewer asked four short questions in a row about concurrency and basic ...

Software Engineering FundamentalsConcurrencyLinked Lists

How do you lead under risk and uncertainty?

Answer the following engineering leadership questions (EM/Senior level). Use specific examples. 1. Tell me about a time you rejected a technically exc...

Behavioral & LeadershipAmbiguity & Decision MakingConflict & Collaboration

Explain How You Use AI in Engineering Work

Explain How You Use AI in Engineering Work Prompt How do you use AI-assisted tools in your day-to-day engineering work? Give one concrete example, exp...

Behavioral & LeadershipAI-Assisted Development

Machine Learning Engineer Locked

Design a scalable chatbot platform

This question evaluates a candidate's ability to design a scalable, production-grade chatbot platform that integrates ML-based inference, multi-turn c...

Software Engineer Locked

Kth Largest Perfect Binary Subtree

This question evaluates a candidate's ability to combine tree traversal with structural validation, requiring recognition of perfect binary subtrees a...

Merge overlapping closed intervals into a sorted list of disjoint intervals

You are given a list of closed intervals with integer endpoints, in no particular order. Merge every group of intervals that overlap, and return the r...

Coding & AlgorithmsIntervals & Scheduling

Software Engineer Locked

Find Dictionary Matches for a Jammed String

This question evaluates string-processing and pattern-matching skills, specifically run-length grouping of consecutive characters and efficient dictio...

Coding & AlgorithmsString AlgorithmsArrays & Strings

Describe past NLP work and collaboration

Scenario In an initial phone screen, the interviewer asks you to introduce yourself, then drills into your resume. Questions (answer using concrete ex...

Behavioral & LeadershipProject Deep DiveAnnotation & Label Quality

Implement tap-to-infect color grid on iOS

iOS Grid Infection (Flood Fill) Design Goal Build an iOS app that displays a 2D grid with two colors. When the user taps a cell, all 4-directionally a...

Software Engineering FundamentalsGrids & MatricesiOS

Machine Learning Engineer

Design Large-Scale Inference Serving

Design a production inference serving system for a machine learning model used by 100 million daily active users. Your answer should cover: traffic as...

ML System DesignMLOps & Model ServingGPU Infrastructure

Data ScientistSenior+

Explain Shell Script Line-by-Line for Data Science Workflows

Scenario Technical screening for a Principal Data Scientist: reviewing shell script and Python classes Question Explain, line by line, what the provid...

Defend a Project's Schema, Indexes, and Concurrency Model

Defend a Project's Schema, Indexes, and Concurrency Model Choose one data-heavy service you have built and defend its data model under a detailed tech...

Software Engineering Fundamentals

Applied Scientist Locked

LLM Fundamentals: Tokenization Design and KL-Regularized SFT

This question evaluates depth of knowledge in large language model fundamentals, specifically subword tokenization design and KL-regularized supervise...

Machine LearningLLM ApplicationsFine-Tuning & Alignment Techniques

Count ways to decode digit string

You are given a string s consisting of digits '0' to '9'. The string encodes a message using the following mapping: - '1' → A, '2' → B, ..., '26' → Z....

Coding & AlgorithmsDynamic Programming

Software Engineer Locked

Implement a JSON Parser

This question tests practical knowledge of parsing theory, including lexical analysis and recursive-descent parsing applied to a well-defined grammar....

Applied Scientist Locked

Explain NLP/RL concepts used in LLM agents

This question evaluates proficiency in transformer-based NLP, embedding methods, LLM agent architecture and evaluation, retrieval techniques for RAG, ...

Machine LearningAI AgentsRetrieval-Augmented Generation

242 people solved

Feb 9, 2026

Tech Interview Questions

Walk Through an ETL Project

Walk through an A/B test end-to-end

Design a feed ads A/B test with guardrails

Find minimal property set in neighborhood

Thread Safety, Deadlock Prevention, and Arrays vs Linked Lists

How do you lead under risk and uncertainty?

Explain How You Use AI in Engineering Work

Design a scalable chatbot platform

Kth Largest Perfect Binary Subtree

Merge overlapping closed intervals into a sorted list of disjoint intervals

Find Dictionary Matches for a Jammed String

Describe past NLP work and collaboration

Implement tap-to-infect color grid on iOS

Design Large-Scale Inference Serving

Explain Shell Script Line-by-Line for Data Science Workflows

Defend a Project's Schema, Indexes, and Concurrency Model

LLM Fundamentals: Tokenization Design and KL-Regularized SFT

Count ways to decode digit string

Implement a JSON Parser

Explain NLP/RL concepts used in LLM agents

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ML System Design

System Design Interview