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

Tower

Medium

Machine Learning Engineer

Explain the KV Cache and Prefill-Decode Disaggregation in LLM Serving

This round for a machine learning engineer role focused on ML infrastructure rather than modeling. The interviewer asked conceptual questions about se...

Machine LearningLLM Inference & ServingTransformers & Attention

Add Distinct-Letter Counts across Every Substring

Problem The appeal of a string is the number of distinct letters it contains. Given a lowercase string s, return the total appeal of all its nonempty ...

Coding & AlgorithmsArrays & StringsDynamic Programming

Solve two algorithm problems from a menu

Choose two problems from an algorithms menu (arrays, strings, hash maps, graphs). For each: 1) state clarifying assumptions, 2) implement a correct so...

Coding & AlgorithmsArrays & StringsGraphs

Software Engineer Locked

Schedule Fixed-Order Tasks with a Cooldown

Find the minimum calendar days needed to execute tasks in their fixed input order when repeated task IDs require a specified number of complete cooldo...

Data ScientistIntern Locked

Compute the Arc Length of a Curve

Derive the exact arc length of y = (2/3)x^(3/2) + 1 on [0, 1], showing the derivative, integral setup, and evaluation.

Software Engineer Locked

Describe a Complex Project You Worked On and Why It Was Challenging

Behavioral hiring-manager question: describe a complex project you worked on and explain why it was challenging, often after a resume walk-through. Te...

Behavioral & LeadershipProject Deep Dive

Reverse Each Binary Row and Invert Its Bits

Problem Flip the square binary image horizontally by reversing each row, then replace 0 with 1 and 1 with 0. Return the resulting image. `cpp class So...

Coding & AlgorithmsGrids & MatricesTwo Pointers & Sliding Window

Most Frequent k Words or Bestselling Titles with Alphabetical Tie-Breaks

Given a list of items, such as the words in a stream of text (the hot words) or the book titles in a list of sales (the bestsellers), return the k ite...

Coding & AlgorithmsHeaps & Priority QueuesSorting

37 people solved

Apr 28, 2026

GoogleMetaMicrosoftAmazon

Easy

Software Engineer

Return Indices of Words Containing a Given Character

Return Indices of Words Containing a Given Character You are given a 0-indexed array of strings words and a character x. Return an array containing th...

Coding & AlgorithmsArrays & Strings

7 people solved

OpenAI

Hard

Machine Learning Engineer

Compute time to infect all cells

You are given an n × m grid representing people in a city. - Each cell is either infected (1) or healthy (0). - Two cells are neighbors if they share ...

Coding & AlgorithmsGrids & MatricesGraphs

Software Engineer Locked

Implement retrieval and evaluation for a simple RAG

This question evaluates understanding of embedding-based retrieval, cosine similarity ranking, and retrieval evaluation metrics (Recall@10 and MRR@10)...

Coding & AlgorithmsRetrieval-Augmented GenerationEmbeddings & Vector Search

Python Generators, yield, Lazy Evaluation and How Decorators Work

Explain what generators and decorators are in Python and why you would use them. These came as a quick oral sequence in the fundamentals half of a tec...

Software Engineering FundamentalsProgramming Languages

Build a Tic-Tac-Toe App

Implement a simple Tic-Tac-Toe mobile app that can be completed in a 45-minute coding interview. Requirements: - Display a 3x3 board. - Support two lo...

Smallest Valid Course Order from Prerequisite Pairs, with Cycle Detection

Courses are numbered 0 to n - 1, and some courses must be taken before others. Return an order in which every course can be taken, or an empty list if...

Coding & AlgorithmsGraphsHeaps & Priority Queues

Compute max events in any 60-second window

Design a function that, given a non-decreasing list of integer timestamps (seconds), returns the maximum number of events occurring within any contigu...

Coding & AlgorithmsTwo Pointers & Sliding Window

Implement encode/decode for list of strings

You are given a list of strings (may include digits and symbols). Implement two methods: - encode(List<String> input) -> String: converts the list int...

Coding & AlgorithmsParsing & InterpretersArrays & Strings

Software Engineer Locked

Resolve a Workplace Conflict

Prepare a grounded conflict-resolution story that demonstrates listening, evidence, ownership, and a durable working agreement.

Behavioral & Leadership

Software Engineer Locked

Design a Fault-Tolerant Online Chess Service

Design a fault-tolerant online chess service with authoritative move ordering, server-managed clocks, reconnects, spectators, and recovery from applic...

Software Engineer Locked

Design Interviewer Availability and Atomic Booking APIs

Design a relational schema and three APIs for interview scheduling: interviewers mark available time slots, candidates list available slots in the nex...

Data Scientist Locked

Handle repeated churn in SQL

This question evaluates proficiency in time-based data manipulation and analytics, including handling repeated churn and resubscription, interval logi...

Data Manipulation (SQL/Python)SQLSegmentation & Cohort Analysis

225 people solved

Jan 22, 2026

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Tech Interview Questions

Explain the KV Cache and Prefill-Decode Disaggregation in LLM Serving

Add Distinct-Letter Counts across Every Substring

Solve two algorithm problems from a menu

Schedule Fixed-Order Tasks with a Cooldown

Compute the Arc Length of a Curve

Describe a Complex Project You Worked On and Why It Was Challenging

Reverse Each Binary Row and Invert Its Bits

Most Frequent k Words or Bestselling Titles with Alphabetical Tie-Breaks

Return Indices of Words Containing a Given Character

Compute time to infect all cells

Implement retrieval and evaluation for a simple RAG

Python Generators, yield, Lazy Evaluation and How Decorators Work

Build a Tic-Tac-Toe App

Smallest Valid Course Order from Prerequisite Pairs, with Cycle Detection

Compute max events in any 60-second window

Implement encode/decode for list of strings

Resolve a Workplace Conflict

Design a Fault-Tolerant Online Chess Service

Design Interviewer Availability and Atomic Booking APIs

Handle repeated churn in SQL

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