Tech Interview Questions

Practice the exact questions companies are asking right now.

Questions

404

Companies

980

Updated

11.12.2026

404 Questions 980 Companies11.12.2026

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

Stripe

Medium

Software EngineerNew Grad

Debug Colander Output Bugs: Stray None, Nested Lists, and Empty List Versus Null

You are given a working copy of Colander, an open-source Python library that validates and deserializes data against a declared schema, into which bug...

Software Engineering FundamentalsDebuggingProgramming Languages

Chat event aggregator: sliding-window message counts and active chats per user

Users can hold conversations in many separate chat sessions. A stream of events describes their activity, and you are asked to build an in-memory aggr...

Software Engineering FundamentalsData Structure DesignStacks & Queues

Conversation Agent History: Paginated Fetching, Then Token-Limit Compaction

You are building the message-history layer of a conversation agent: the component that holds the conversation's messages and hands them to the languag...

Software Engineering FundamentalsAPI Integration & HTTP ClientsLLM Applications

Sliding-Window Chat Analytics: Recent Counts, Live Sessions, Out-of-Order Events

Build an in-memory, single-threaded analytics service for chat sessions. It consumes a real-time stream of interaction log records, and each record ha...

Software Engineering FundamentalsData Structure DesignStacks & Queues

Stack with Constant-Time Minimum over a Sequence of Operations

Design a stack that supports pushing an element, popping the top element, reading the top element, and reading the smallest element currently in the s...

Coding & AlgorithmsData Structure DesignStacks & Queues

Evaluate Ordered Accept/Block Transaction Rules with AND, OR and Parentheses

In this round you write Python in a coding environment that has a built-in AI assistant, and you are expected to use it. Implement a transaction risk-...

Software Engineering FundamentalsParsing & Interpreters

Implement a Per-User Request Throttle Over a Sliding Time Window

Design and implement a throttling API. Given a limit N and a window length W, each user may make at most N requests within any time window of length W...

Software Engineering FundamentalsRate LimitingData Structure Design

Software EngineerSenior+

Rectangle board: add rectangles, count those covering a point, and undo

Implement a board that holds axis-aligned rectangles and supports three operations: add a rectangle, return how many rectangles on the board contain a...

Software Engineering FundamentalsData Structure Design

Make a Web Crawler Concurrent with Thread-Safe Visited State

Start with a single-threaded web crawler, then redesign it for concurrent fetching. Explain how discovered links enter the work queue and how shared v...

Software Engineering FundamentalsConcurrencyGraphs

422 people solved

Oct 5, 2026

RobloxAmazonBloomberg

Medium

Software Engineer

Canonicalize an Absolute Unix Path

Problem Simplify the absolute Unix-style path absolute_path into its canonical form by applying these path-component rules: - Repeated slashes act as ...

Coding & AlgorithmsStacks & QueuesParsing & Interpreters

95 people solved

OpenAI

Hard

Machine Learning Engineer

Rectangle grid with IDs: coverage counts, replace and delete, O(1) queries, batch undo

Implement a class that maintains a two-dimensional grid of cells onto which rectangles are placed, each rectangle with its own ID. The requirements ar...

Software Engineering FundamentalsData Structure Design

Simulate a High-Card Deck Game for Two Players, Then N Players

Model and simulate a simple card game. Define your own classes and methods. The interviewer supplies test cases to check your code, so the design shou...

Software Engineering FundamentalsLow-Level Design (OOP)Simulation & State Machines

Repeatedly Delete Adjacent Duplicate Pairs or Whole Runs of Equal Characters

You are given a string s of lowercase letters and a flag remove_whole_runs. Delete adjacent duplicates repeatedly until none remain, and return the fi...

Coding & AlgorithmsStacks & QueuesArrays & Strings

105 people solved

Oct 10, 2026

CompassBloombergGoogle

Medium

Software Engineer

Decode Nested Repetition Strings with Stacks

Decode strings using the pattern k[encoded], where the bracketed content is repeated k times and may contain nested repetitions. Plain letters remain ...

Coding & AlgorithmsParsing & InterpretersStacks & Queues

21 people solved

Replit

Hard

Software EngineerNew Grad

Convert Editor Keystrokes into a Minimal Insert, Delete and Skip Operation List

A text editor records an editing session as an initial document and a list of keystrokes. The cursor starts at position 0, before the first character ...

Coding & AlgorithmsSimulation & State Machines

In-Memory File System: Add cd and Relative Path Support

Implement an in-memory file system as a class, in stages. The early stages build a tree of directories and files addressed by absolute paths. The fina...

Software Engineering FundamentalsTreesCode Quality & Maintainability

Parse a Truncated Streaming JSON Prefix of Strings and Nested Arrays

A language model streams its output as JSON, and the client wants to show what has arrived so far without waiting for the stream to finish. Given the ...

Coding & AlgorithmsParsing & Interpreters

Software EngineerSenior+

Implement a Fixed-Capacity Ring Buffer in C for Firmware

Implement a fixed-capacity ring buffer (circular buffer) in C. Its storage is set up once, and the write and read positions wrap back to the start of ...

Software Engineering FundamentalsData Structure DesignConcurrency

Software EngineerNew Grad

Minutes Until Spoilage Spreads to Every Fresh Item in a Grid

A storage grid holds perishable items. Each cell is empty (0), holds a fresh item (1), or holds a spoiled item (2). Every minute, each fresh item that...

Coding & AlgorithmsGrids & MatricesGraphs

19 people solved

Oct 24, 2026

GoogleBlackRockAmazon

Easy

Software Engineer

Check Matching and Nested Brackets

Problem The string brackets contains only (, ), [, ], {, and }. Return true exactly when all brackets can be matched correctly; otherwise return false...

Coding & AlgorithmsStacks & QueuesParsing & Interpreters

38 people solved

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Tech Interview Questions

Debug Colander Output Bugs: Stray None, Nested Lists, and Empty List Versus Null

Chat event aggregator: sliding-window message counts and active chats per user

Conversation Agent History: Paginated Fetching, Then Token-Limit Compaction

Sliding-Window Chat Analytics: Recent Counts, Live Sessions, Out-of-Order Events

Stack with Constant-Time Minimum over a Sequence of Operations

Evaluate Ordered Accept/Block Transaction Rules with AND, OR and Parentheses

Implement a Per-User Request Throttle Over a Sliding Time Window

Rectangle board: add rectangles, count those covering a point, and undo

Make a Web Crawler Concurrent with Thread-Safe Visited State

Canonicalize an Absolute Unix Path

Rectangle grid with IDs: coverage counts, replace and delete, O(1) queries, batch undo

Simulate a High-Card Deck Game for Two Players, Then N Players

Repeatedly Delete Adjacent Duplicate Pairs or Whole Runs of Equal Characters

Decode Nested Repetition Strings with Stacks

Convert Editor Keystrokes into a Minimal Insert, Delete and Skip Operation List

In-Memory File System: Add cd and Relative Path Support

Parse a Truncated Streaming JSON Prefix of Strings and Nested Arrays

Implement a Fixed-Capacity Ring Buffer in C for Firmware

Minutes Until Spoilage Spreads to Every Fresh Item in a Grid

Check Matching and Nested Brackets

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