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

Evaluate Groupon's Impact on Restaurant's Profitability and Strategy

Evaluating a Groupon-Style Deal for a Restaurant You own a restaurant, and a Groupon-style deals website proposes selling discount vouchers for your v...

Analytics & ExperimentationBusiness Case AnalysisGrowth & Monetization

Software Engineer Locked

Implement an in-memory storage with TTL and scans

This question evaluates implementation of an in-memory two-level key->field->value store with TTL semantics, lexicographic scans and prefix filtering,...

Design quota enforcement for high concurrency

System Design: Quota Enforcement Service at Very High QPS Context You are designing a multi-tenant quota and rate-limiting service used by many backen...

System DesignRate LimitingAPI Design

Software Engineer Locked

Find kth element and sliding-window kth in stream

This question evaluates understanding of order statistics and selection in arrays as well as sliding-window stream processing, including maintaining k...

Coding & AlgorithmsSortingData Structure Design

Software Engineer Locked

A Project You Decided Not to Ship

This question evaluates judgment and ownership by asking about a project abandoned before release rather than one that shipped. It tests decision-maki...

Behavioral & LeadershipOwnership & ExecutionAmbiguity & Decision Making

Machine Learning Engineer

Design a scalable service and model performance

System Design: Multi-Region, 50k QPS, p95 < 100 ms Context Design an online, read-heavy key-value service (for example, a user profile or feature look...

System DesignKey-Value StoresConsistency & Availability

Design Siri-vs-GPT query routing

You are a Data Scientist at Apple designing a feature that decides whether a user's natural-language query should be routed to Siri or to a GPT-based ...

Machine LearningML System DesignModel Evaluation

Software Engineer Locked

Implement Calendar, Tokenizer, and Meeting Optimizer

This question evaluates competencies in interval scheduling and overlap detection, custom string tokenization and parsing rules, and combinatorial opt...

Coding & AlgorithmsIntervals & SchedulingDynamic Programming

Compute DAU and rolling MAU with zero days

You have two tables in PostgreSQL: Tables users - user_id (STRING / INT, PK) - signup_date (DATE) logins - user_id (STRING / INT, FK → users.user_id) ...

Data Manipulation (SQL/Python)Metrics & KPIsSQL

Solve three interview coding problems

This interview report described three coding tasks: 1. Generate a run-length spoken sequence Start with s1 = "1". To build the next term, read the ...

Coding & AlgorithmsArrays & StringsBacktracking & Recursion

Machine Learning Engineer

Write self-attention and cross-entropy pseudocode

You are asked to explain core Transformer / deep learning components. Part A — Self-attention pseudocode Write clear pseudocode (not full code) for sc...

Machine LearningTransformers & AttentionML Coding

Test easy–medium array/string tasks

For typical easy–medium array and string problems, list the most important edge cases you would test (e.g., empty input, single element, duplicates, a...

Coding & AlgorithmsTesting & Quality

Design a contiguous segment allocator

Design an in-memory contiguous segment allocator over an array of n cells (indexed 0..n- 1), all initially free. Support two operations: 1) allocate(l...

Coding & AlgorithmsData Structure DesignIntervals & Scheduling

Design a Multimodal Training Data Pipeline

Design a backend system for collecting, filtering, and storing training data sent by many clients. Clients upload records that may include large media...

Implement factorial and count trailing zeros

Answer the following coding questions in Python. 1) Implement factorial Implement a function factorial(n) that returns $n!$ for a non-negative integ...

Coding & AlgorithmsMath & Number Theory

Data Scientist Locked

Estimate Experiment Duration with Power Analysis

Estimate A/B test sample size and duration for a binary metric. Connect alpha, power, baseline rate, and minimum detectable effect to traffic, trigger...

Analytics & Experimentation

Solve four classic algorithm problems

You are given four independent coding tasks. For each task, implement the required function. --- Problem 1: Zigzag level-order traversal of a binary t...

Coding & AlgorithmsDynamic ProgrammingTrees

Software Engineer Locked

Architecture and Data-Scaling Trade-offs

This question evaluates a candidate's grasp of software architecture and database scaling trade-offs, covering microservices versus monolithic design ...

Software Engineering Fundamentals

Check if each prefix forms 1..k permutation

You are given an integer array arr of length n that is a permutation of the numbers 1..n (each number appears exactly once), but in arbitrary order. F...

Coding & AlgorithmsArrays & Strings

Design scalable LRU cache and backtracking API

Design scalable LRU cache and backtracking API System Design: Two Production-Ready Services A) Thread-Safe LRU Caching Service Design and describe a p...

System DesignCachingConcurrency

308 people solved

Jul 26, 2025

Tech Interview Questions

Evaluate Groupon's Impact on Restaurant's Profitability and Strategy

Implement an in-memory storage with TTL and scans

Design quota enforcement for high concurrency

Find kth element and sliding-window kth in stream

A Project You Decided Not to Ship

Design a scalable service and model performance

Design Siri-vs-GPT query routing

Implement Calendar, Tokenizer, and Meeting Optimizer

Compute DAU and rolling MAU with zero days

Solve three interview coding problems

Write self-attention and cross-entropy pseudocode

Test easy–medium array/string tasks

Design a contiguous segment allocator

Design a Multimodal Training Data Pipeline

Implement factorial and count trailing zeros

Estimate Experiment Duration with Power Analysis

Solve four classic algorithm problems

Architecture and Data-Scaling Trade-offs

Check if each prefix forms 1..k permutation

Design scalable LRU cache and backtracking API

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