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

Maximum Length of a Word Selection With All Unique Characters

You are given an array of lowercase strings words. Select a subset of these words (zero or more, chosen in any order) and concatenate them. The select...

Coding & Algorithms

26 people solved

Mar 6, 2026

Design an Online Coding Judge

This question evaluates system design and scalability skills for building a high-throughput, low-latency online coding judge, covering distributed arc...

Evaluate Impact of New Roblox Homepage Tab

Evaluate the Impact of a New Roblox Homepage Tab Roblox plans to replace an existing homepage tab with a new one. The team needs to measure whether th...

Analytics & ExperimentationExperiment Design (A/B Testing)Metrics & KPIs

Machine Learning Engineer Locked

Reverse a Linked List in Groups of K

Implement reverse_k_group(values, k) for a singly linked list represented by the array values in traversal order. Work through the function contract, ...

Software Engineer Locked

Design a distributed crossword solving service

This question evaluates distributed systems and large-scale backend architecture skills, including task decomposition, scheduling, dynamic load balanc...

System DesignJob Scheduling & WorkflowsFault Tolerance & Failover

258 people solved

Oct 17, 2025

Analyze Minimum Completion Time for Target Courses in a Prerequisite DAG

Interview Prompt You are given courses, each course's completion time, prerequisite edges, and a list of target courses. Design an algorithm for the m...

Software Engineering Fundamentals

Compute ruin probability with bold betting

Probability of Reaching 5 Tokens Before Ruin Setup - You start with 3 tokens, target is 5 tokens, and ruin is 0. - On each turn, you bet as many token...

Statistics & MathProbabilityPuzzles & Brainteasers

Design distributed word count without MapReduce

System Design: Distributed Word Frequency Counting (No MapReduce) Context You need to design a distributed system that computes word frequencies over ...

System DesignBatch & Stream ProcessingDistributed Transactions & Idempotency

Detect credit-card transaction fraud

Credit-Card Fraud Detection: Real-Time Decisioning and System Design You are designing a real-time decisioning system for card-payment authorizations ...

ML System DesignModel EvaluationUnsupervised Learning

Data Scientist Locked

Build and evaluate an order prediction model

This question evaluates a data scientist's competency in building and evaluating binary classification models with temporal constraints and operationa...

Machine LearningSupervised LearningModel Evaluation

Build a QuadTree From a Grid

Implement a compressed QuadTree for a square grid. You are given an n x n grid of values, where n is a power of two. The values are not limited to bin...

Find returning users from access logs

Given a large user access log, parse it and identify which user_ids are returning customers—i.e., they have at least one visit on two or more distinct...

Data Manipulation (SQL/Python)

Software Engineer Locked

Design an E-Commerce Shopping Website

This question evaluates a candidate's ability to design scalable, distributed backend systems for high-traffic e-commerce workloads. It tests practica...

Write SQL to flag suspect payments and chargebacks

Assume today is 2025-09-01. Using only CASE WHEN and JOINs (no window functions required), write a single SQL query that produces, for each user with ...

Data Manipulation (SQL/Python)

Compute weekly 3-week rolling sums in SQL

Using PostgreSQL, write a single query that outputs, for each calendar week in a given range, the sum of amounts in that week and a rolling sum over t...

Data Manipulation (SQL/Python)

Data Scientist Locked

Return sorted values after quadratic transform

This question evaluates understanding of mathematical transformations and array manipulation, specifically how applying a quadratic function affects t...

Coding & AlgorithmsTwo Pointers & Sliding WindowArrays & Strings

Solve three coding interview problems

You are given three independent coding questions. 1) Decode an encoded string Given an encoded string s, decode it using the following rule: - Pattern...

Coding & AlgorithmsDynamic ProgrammingGrids & Matrices

Software EngineerSenior+ Locked

Implement stream queries and bounded-difference subarrays

This question evaluates proficiency in data structures and algorithmic problem-solving, covering streaming uniqueness tracking (first-non-repeated ele...

Coding & AlgorithmsStacks & QueuesTwo Pointers & Sliding Window

Recommend and validate a budget allocation strategy

Using insights you would derive from the SQL task (top advertiser by total spend; most profitable program by net profit and by margin), propose a conc...

Analytics & ExperimentationBusiness Case AnalysisExperiment Design (A/B Testing)

Verify and modify inorder subsequence

Question Given a binary tree and a sequence of numbers, design an algorithm to check in O(n) time and O( 1) extra space whether the sequence is a subs...

Coding & AlgorithmsTreesDynamic Programming

160 people solved

Aug 4, 2025

Tech Interview Questions

Maximum Length of a Word Selection With All Unique Characters

Design an Online Coding Judge

Evaluate Impact of New Roblox Homepage Tab

Reverse a Linked List in Groups of K

Design a distributed crossword solving service

Analyze Minimum Completion Time for Target Courses in a Prerequisite DAG

Compute ruin probability with bold betting

Design distributed word count without MapReduce

Detect credit-card transaction fraud

Build and evaluate an order prediction model

Build a QuadTree From a Grid

Find returning users from access logs

Design an E-Commerce Shopping Website

Write SQL to flag suspect payments and chargebacks

Compute weekly 3-week rolling sums in SQL

Return sorted values after quadratic transform

Solve three coding interview problems

Implement stream queries and bounded-difference subarrays

Recommend and validate a budget allocation strategy

Verify and modify inorder subsequence

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