Tech Interview Questions

Practice the exact questions companies are asking right now.

Questions

11.9k

Companies

569

Updated

10.02.2026

11.9k Questions 569 Companies10.02.2026

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

Perplexity

Hard

Software Engineer

In-Memory File System: Strict mkdir, touch, ls, rm, rmdir and a Command Runner

Implement an in-memory file system with directories and files under a single root, /. The task is delivered as a multi-file project with provided test...

Software Engineering FundamentalsData Structure Design

Count Islands in a Grid and Track the Count as Land Cells Are Added

A map is a grid with m rows and n columns in which every cell is land (1) or water (0). An island is a maximal group of land cells connected horizonta...

Coding & AlgorithmsGraphsGrids & Matrices

Software EngineerIntern

Order Book With Per-Exchange BBO and Cross-Exchange NBBO Queries

Design and implement an in-memory order book that aggregates resting quantity from several exchanges. Every record has an exchange name, a price, a qu...

Software Engineering FundamentalsData Structure DesignHeaps & Priority Queues

Fix Seekable POST Body Replay After a 307 Redirect in Python requests

You are working in a checkout of the open-source Python HTTP library requests. When a server answers a POST with 307 Temporary Redirect, the client mu...

Software Engineering FundamentalsDebugging

Distribute 500 GB of Model Weights to 1,000 GPU Workers: Lower Bound and Design

A newly trained model has 500 GB of weights. The weights must be copied to every machine in a fleet of GPU workers, somewhere between 100 and 1,000 ma...

System DesignFile & Media Storage

Count Events in a Trailing 15-Minute Window with a Fixed-Size Ring Buffer

Implement an event counter for a monitoring system. It supports two operations: - record(timestamp): an event happened at timestamp, an integer number...

Software Engineering FundamentalsData Structure Design

Determine Whether the Last Array Index Is Reachable by Forward Jumps

You are given a list of non-negative integers nums and start at index 0. The value nums[i] is the longest jump you may make from index i: from i you m...

Coding & AlgorithmsGreedy

Verify Business Records with Field and Name Rules

Implement verifyBusinesses(records, requiredFields, lengthField, forbiddenPhrases, ignoredSuffixes). Apply the validation stages below and return one ...

Coding & AlgorithmsArrays & StringsData Cleaning & Wrangling

Count Index Triplets Whose Max Minus Min Is at Most d

You are given an integer array arr and a non-negative integer d. A triplet is a choice of three distinct positions i < j < k of arr. Its spread is the...

Coding & AlgorithmsTwo Pointers & Sliding Window

Machine Learning Engineer

Design a Multi-Tenant Enterprise RAG Assistant: Hybrid Retrieval, Reranking, ACLs

Design a retrieval-augmented generation (RAG) assistant for enterprise customers, in the style of ChatGPT Enterprise: employees ask questions in natur...

ML System DesignRetrieval-Augmented GenerationEmbeddings & Vector Search

Investigate a Server Saturated by Logging

A server is being overwhelmed and logs may be involved. Explain how you would trace the cause, stabilize the service, and prevent the problem from rec...

Software Engineering FundamentalsDebuggingObservability

Software EngineerNew Grad

Count Subarrays Whose Step-by-Step Changes Match an Up, Flat, Down Pattern

You are given an integer array nums of length n and an array pattern of length m whose values are each -1, 0 or 1. Each pattern value describes the re...

Coding & AlgorithmsArrays & Strings

Route and Batch Inference with Eight GPUs

Discuss an inference API design, concentrating on load balancing and batching. Then address a cluster with eight GPUs: one large model needs all eight...

ML System DesignGPU InfrastructureMLOps & Model Serving

Find the first larger value for every element of a circular array

You are given an integer array nums that is treated as circular: after the last element, scanning continues from the first element. For every index i,...

Coding & AlgorithmsStacks & Queues

51 people solved

Sep 21, 2026

Implement the Forward Pass of Multi-Head Attention From Scratch

Implement the forward pass of a multi-head attention layer from scratch. The interviewer provides no test cases, so correctness has to be argued from ...

Machine LearningTransformers & AttentionML Coding

Performance-Model a Sharded Matrix Multiply: FLOPs, Memory, Network and Roofline

This round is a performance-modeling exercise for machine learning systems, done by hand. Consider the matrix multiplication C = A × B, where A has sh...

Subtract Blocked Periods from Allowed Deployment Windows

Given time intervals when deployment is allowed and intervals when it is blocked, return the remaining allowed deployment windows. Implement available...

Coding & AlgorithmsIntervals & SchedulingSorting

Software EngineerIntern

Virtual Card Case Study: Trade-offs, Card Number Rule Checks, and Debugging a Filter

You are working through a technical case study about virtual credit card numbers. A virtual card number is a card number that the issuer generates on ...

Software Engineering FundamentalsDebugging

Software Engineer Locked

Design a Deduplicated Personalized News Feed

Design a personalized news feed that groups cross-publisher coverage into story clusters without losing source diversity or freshness.

Software EngineerNew Grad

Find the Integer Point Covered by the Most Street Lamps

A street is modeled as a number line. You are given lights, where lights[i] = [position_i, range_i] describes a street lamp at integer coordinate posi...

Coding & AlgorithmsIntervals & Scheduling

46 people solved

Sep 27, 2026

Tech Interview Questions

Practice with Claude Code or Codex

In-Memory File System: Strict mkdir, touch, ls, rm, rmdir and a Command Runner

Count Islands in a Grid and Track the Count as Land Cells Are Added

Order Book With Per-Exchange BBO and Cross-Exchange NBBO Queries

Fix Seekable POST Body Replay After a 307 Redirect in Python requests

Distribute 500 GB of Model Weights to 1,000 GPU Workers: Lower Bound and Design

Count Events in a Trailing 15-Minute Window with a Fixed-Size Ring Buffer

Determine Whether the Last Array Index Is Reachable by Forward Jumps

Verify Business Records with Field and Name Rules

Count Index Triplets Whose Max Minus Min Is at Most d

Design a Multi-Tenant Enterprise RAG Assistant: Hybrid Retrieval, Reranking, ACLs

Investigate a Server Saturated by Logging

Count Subarrays Whose Step-by-Step Changes Match an Up, Flat, Down Pattern

Route and Batch Inference with Eight GPUs

Find the first larger value for every element of a circular array

Implement the Forward Pass of Multi-Head Attention From Scratch

Performance-Model a Sharded Matrix Multiply: FLOPs, Memory, Network and Roofline

Subtract Blocked Periods from Allowed Deployment Windows

Virtual Card Case Study: Trade-offs, Card Number Rule Checks, and Debugging a Filter

Design a Deduplicated Personalized News Feed

Find the Integer Point Covered by the Most Street Lamps

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