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

Maximize Unique Characters from Words

You are given a list of lowercase English words. Select a subset of the words such that no character appears more than once across all selected words....

Determine Normality of Single Observation with Z-Test

Hypothesis Test for One Observation Against a Standard Normal You observe a single numeric value x and want to decide whether it could plausibly have ...

Statistics & MathHypothesis TestingProbability

Build a Recommendation System and Conversational Interface from Scratch

Build a Recommendation System and Conversational Interface from Scratch Design an initial recommendation system, then extend it with a chatbot that ca...

Learn from a Major Work Setback

Question Describe a work experience that left you seriously frustrated or disappointed. What was under your control, how did you respond, and what did...

Behavioral & Leadership

Machine Learning Engineer

List regularization methods and trade-offs

Question: Compare Regularization Techniques and When to Use Them Context: You are interviewing for a machine learning engineering role and are asked t...

Machine LearningML FundamentalsNeural Networks & Training

Describe Your Path and Key Data Science Project

Describe Your Path and Key Data Science Project Onsite Behavioral + Project Deep Dive (Data Scientist) Context You are in an onsite behavioral round f...

Behavioral & LeadershipProject Deep DiveExperiment Design (A/B Testing)

Demonstrate Leadership Principles in Projects

Demonstrate Leadership Principles in Projects This Amazon Software Engineer behavioral/technical screen asks you to demonstrate the Amazon Leadership ...

Behavioral & LeadershipLeadership & InfluenceOwnership & Execution

Apply sliding window techniques

Apply sliding window techniques Explain the sliding window technique and apply it to solve: ( 1) Given an array of positive integers and a target S, r...

Coding & AlgorithmsTwo Pointers & Sliding Window

Software Engineer Locked

Implement a Log Rate Limiter

This question evaluates a candidate's ability to design and implement time-based rate limiting and stateful event tracking using appropriate data stru...

Coding & AlgorithmsRate LimitingData Structure Design

Design human review to estimate model accuracy

Design human review to estimate model accuracy You need to estimate the accuracy of an ML classifier on a population of subjects. You can only afford ...

Describe Resolving Stakeholder Trade-Offs

Tell me about a time when you worked with multiple stakeholders who had different needs or priorities, and you had to create a solution that satisfied...

Behavioral & Leadership

Exclude free subscribers via anti-join

Extend your previous monthly new-subscriber + YoY query to exclude companies that ever received a free subscription, using an anti-join against Free_S...

Data Manipulation (SQL/Python)

Design server allocation for multi-type nodes

Design a service to manage a large pool (about 100, 000) of server nodes. Each node can satisfy multiple instance types; clients call getServer(reqNum...

Coding & AlgorithmsSystem Design FundamentalsData Structure Design

Sort and merge string lists by length

Given two unsorted lists of strings, return a single list sorted by ascending string length. Specify your tie-breaking rule for equal-length strings (...

Coding & Algorithms

88 people solved

Sep 6, 2025

Compute cohort GMV and payer rate with edge cases

You are given the following schema (timestamps are UTC): users(user_id INT, country STRING, created_at TIMESTAMP) events(user_id INT, event_ts TIMESTA...

Data Manipulation (SQL/Python)SQLSegmentation & Cohort Analysis

Software Engineer Locked

Serialize Expression Tree Minimizing Parentheses

This question evaluates proficiency with binary expression trees, operator precedence and associativity, and the ability to serialize an abstract synt...

Coding & AlgorithmsParsing & InterpretersTrees

Contrast processes and threads

What are the differences between processes and threads? Compare memory isolation, resource ownership, scheduling, context-switch cost, inter-process c...

Coding & AlgorithmsOperating SystemsConcurrency

Software EngineerSenior+ Locked

Choose models for trading tasks

This question evaluates a candidate's competency in selecting and reasoning about machine learning models for quantitative trading and pricing, includ...

Machine LearningML FundamentalsModel Evaluation

111 people solved

Jan 26, 2026

Find Kth Largest and Tree Ancestors

In a technical phone interview, the candidate was asked two coding problems in the same round: 1. K-th largest element in an array Given an unsorte...

Find normalized list difference efficiently

Given two lists of strings, list1 and list2, return all elements that appear in list1 but not in list2 after applying a consistent normalization step ...

Coding & AlgorithmsArrays & Strings

102 people solved

Sep 6, 2025

Tech Interview Questions

Maximize Unique Characters from Words

Determine Normality of Single Observation with Z-Test

Build a Recommendation System and Conversational Interface from Scratch

Learn from a Major Work Setback

List regularization methods and trade-offs

Describe Your Path and Key Data Science Project

Demonstrate Leadership Principles in Projects

Apply sliding window techniques

Implement a Log Rate Limiter

Design human review to estimate model accuracy

Describe Resolving Stakeholder Trade-Offs

Exclude free subscribers via anti-join

Design server allocation for multi-type nodes

Sort and merge string lists by length

Compute cohort GMV and payer rate with edge cases

Serialize Expression Tree Minimizing Parentheses

Contrast processes and threads

Choose models for trading tasks

Find Kth Largest and Tree Ancestors

Find normalized list difference efficiently

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