Tech Interview Questions

Practice the exact questions companies are asking right now.

Questions

18.6k

Companies

980

Updated

11.12.2026

18.6k 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

Decagon

Medium

Software Engineer Locked

Implement a Recipe Cart

This question evaluates the ability to design and implement stateful data structures and aggregation logic for tracking ingredient counts, applying ti...

Coding & AlgorithmsData Structure DesignStacks & Queues

323 people solved

May 20, 2026

AmazonGoogleMicrosoft

Medium

Software Engineer

Minimize a Number After Removing Digits

Minimize a Number After Removing Digits Given a decimal string num representing a nonnegative integer and an integer k, delete exactly k digits. Keep ...

Coding & AlgorithmsGreedyStacks & Queues

Implement ordering and undo executor

The interview included two coding tasks: 1. Dependency ordering: Given a set of tasks and their dependency relationships, return a valid execution ord...

Coding & AlgorithmsGraphsStacks & Queues

Control LLM Workflow Quotas and Recovery Costs

A distributed DAG workflow system calls external LLM providers for document summarization, embeddings, extraction, and inference. Model tasks may take...

System DesignRate LimitingDistributed Transactions & Idempotency

Software EngineerNew Grad

Incremental n x n Tic-Tac-Toe Game-Over Check in O(n), Then O(1) per Move

An n x n tic-tac-toe game is played by players 1 and 2. A player wins by occupying all n cells of a row, a column, the main diagonal (cells (i, i)) or...

Software Engineering FundamentalsSimulation & State MachinesData Structure Design

Data Scientist Locked

t-Stat With an Added Orthogonal Regressor, Live Sharpe Check, and Absolute-Loss Estimator

Three written quantitative questions: how an OLS t-statistic changes when an orthogonal regressor is added, how many flat live trading days should mak...

Statistics & MathHypothesis TestingRegression & Statistical Modeling

Check whether every path from a source node ends at a destination

You are given a directed graph with n nodes, a source node and a destination node. Decide whether every path that starts at source ends at destination...

Coding & AlgorithmsGraphs

Software Engineer Locked

Design Retrieval-Augmented Answers from a Document Vault

Design a document-vault question-answering service that returns grounded responses with citations while preserving tenant and document permissions. Co...

ML System DesignRetrieval-Augmented GenerationLLM Applications

Design a Test Strategy for a System That Counts the Leaves on a Large Tree

In a QA engineer interview, the testing scenario was: how would you test a system that counts the number of leaves on a large tree? The prompt is deli...

Software Engineering FundamentalsTesting & Quality

Machine Learning Engineer Locked

Implement Backprop for a Tiny Network

This question evaluates understanding of backpropagation, gradient derivation, numerical stability of softmax cross-entropy, and practical implementat...

Machine LearningML CodingNeural Networks & Training

Software Engineer Locked

Calculate Highway Tolls from Ordered Checkpoint Logs

Calculate a day's total highway toll from chronologically ordered vehicle checkpoint logs, charging every consecutive recorded segment even when a veh...

Coding & AlgorithmsArrays & Strings

Check for a Palindrome after at Most One Deletion

Problem Return whether deleting zero or one character from s can leave a palindrome. The remaining characters keep their original order. `cpp class So...

Coding & AlgorithmsTwo Pointers & Sliding WindowArrays & Strings

11 people solved

Canva

Easy

Software EngineerSenior+

Implement a Key-Value Map from Scratch Without Built-in Dictionaries

Implement a map (a key-value store) from scratch, without using the language's built-in dictionary, hash map or tree map types. It must support: - put...

Software Engineering FundamentalsData Structure Design

Report Seven-Day Revenue Totals and Averages

Problem Report visited_on, amount and average_amount for each complete seven-day window ending on visited_on. amount sums all customer payments over t...

Data Manipulation (SQL/Python)SQL

15 people solved

Nuro

Hard

Software Engineer Locked

Search Large Vehicle Records with Bounded Memory

Design range search over petabytes of large vehicle records with one-year retention, selective indexes, bounded-memory execution, and stable result de...

System DesignIndexing & Query PerformanceStorage & Sharding

Software EngineerSenior+

Multi-tenant resource allocator: entity model, lifecycle state machine, optimistic locking

You are in the low-level design round of a senior backend loop for a multi-tenant SaaS platform. Design the core of a resource allocation module: cust...

Software Engineering FundamentalsLow-Level Design (OOP)Transactions & Isolation

Data Scientist Locked

Count Users Whose First Daily Event Is App Launch

Write PostgreSQL to count users whose first event of each day is an app launch, grouped by operating system and device. Practice deterministic window ...

Data Manipulation (SQL/Python)

Compute the Optimal Prefix-Merging Game Difference

Problem Alice and Bob alternate with Alice first. With more than one stone remaining, choose at least two leftmost stones, add their sum to the curren...

Coding & AlgorithmsDynamic Programming

14 people solved

Anthropic

Medium

Software Engineer Locked

Path Resolution with Symbolic Links

This question evaluates a candidate's ability to implement filesystem-style path resolution, including handling relative and absolute paths, dot compo...

Count Connectable Server Pairs Through Each Tree Vertex

Count Connectable Server Pairs Through Each Tree Vertex You are given a valid unrooted weighted tree with n servers numbered 0..n - 1. Each row edges[...

Coding & AlgorithmsTreesMath & Number Theory

21 people solved

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Tech Interview Questions

Implement a Recipe Cart

Minimize a Number After Removing Digits

Implement ordering and undo executor

Control LLM Workflow Quotas and Recovery Costs

Incremental n x n Tic-Tac-Toe Game-Over Check in O(n), Then O(1) per Move

t-Stat With an Added Orthogonal Regressor, Live Sharpe Check, and Absolute-Loss Estimator

Check whether every path from a source node ends at a destination

Design Retrieval-Augmented Answers from a Document Vault

Design a Test Strategy for a System That Counts the Leaves on a Large Tree

Implement Backprop for a Tiny Network

Calculate Highway Tolls from Ordered Checkpoint Logs

Check for a Palindrome after at Most One Deletion

Implement a Key-Value Map from Scratch Without Built-in Dictionaries

Report Seven-Day Revenue Totals and Averages

Search Large Vehicle Records with Bounded Memory

Multi-tenant resource allocator: entity model, lifecycle state machine, optimistic locking

Count Users Whose First Daily Event Is App Launch

Compute the Optimal Prefix-Merging Game Difference

Path Resolution with Symbolic Links

Count Connectable Server Pairs Through Each Tree Vertex

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