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

Optiver

Medium

Software Engineer Locked

Count Straight-Line Occurrences of a Word in a Letter Grid, Rows and Columns Only

Count how many times a target word appears in a grid of letters when read in a straight line along a row or down a column, with no turns and overlappi...

Coding & AlgorithmsGrids & Matrices

Software Engineer Locked

Determine Whether the Last Array Index Is Reachable by Forward Jumps

Decide whether the last index of an array can be reached from the first when each value gives the longest forward jump allowed from that position. Tes...

Coding & AlgorithmsGreedy

Implement a Dependency-Aware Task Scheduler

Implement a TaskManager class with two methods: - AddTasks(tasks): add one or more tasks into the system. - ConsumeTask(): return and remove the execu...

Coding & AlgorithmsData Structure DesignGraphs

Machine Learning Engineer

Improve Training With Noisy Annotators

You are given a labeled training dataset as a Pandas DataFrame. Each row contains feature columns, an observed label, and an annotator_id identifying ...

Machine LearningAnnotation & Label QualityModel Evaluation

Find Values Repeated in Three Consecutive Log Rows

Problem Report each num that appears in at least three consecutive Logs rows in id order. The source id is an auto-increment key starting at 1. Name t...

Data Manipulation (SQL/Python)SQL

Implement 2048 Board Tilts in Four Directions with Merging and Game-Over Detection

You are implementing the move logic of the sliding-tile game 2048. The board is a 4 x 4 grid. Each cell is either empty, written 0, or holds a tile wh...

Software Engineering FundamentalsSimulation & State Machines

Software Engineer Locked

Design Power-Grid Device Monitoring over Unreliable Networks: Dedup and Late Events

Design a monitoring platform for power-grid devices that report readings and upload logs over unreliable public networks. Ingestion must be idempotent...

System DesignDistributed Transactions & IdempotencyBatch & Stream Processing

Data Science Project You Are Most Proud Of: Stakeholders, Impact and Hindsight

In a hiring-manager interview for a data scientist role, the interviewer first describes what the role involves and then asks about your experience th...

Behavioral & LeadershipProject Deep DiveCommunication & Stakeholders

Software EngineerSenior+

Explain What a Database Index Is: Lookups, Composite Keys and Write Trade-offs

In a short screening call for a senior, customer-facing engineering role, the interviewer asks: > Explain what a database index is. The call focuses o...

Software Engineering FundamentalsIndexing & Query Performance

Hotel Vending Machine Product Design: Guest Segment, Features and Success Metrics

Your interviewer asks you to design a vending machine for a hotel. Decide which guests it is for, which of their problems it should solve, what it sel...

Product Design & StrategyProduct SenseMetrics & KPIs

Backend EngineerNew Grad

Implement Notification Rate Limiter

Implement should_send_notifications(user_id, timestamp) -> bool. You are given two mappings: - each user_id belongs to exactly one team_id - each team...

Coding & AlgorithmsData Structure DesignRate Limiting

Software Engineer Locked

Build a Live API-Connected DAG Workflow for Late-Order Refund Requests

Design a running local order-status workflow that follows a DAG, triggers observable refund requests, and handles repeated evaluations safely.

Software Engineering FundamentalsJob Scheduling & WorkflowsAI-Assisted Development

Software Engineer Locked

Discuss a Challenging Project, Leadership Evidence, and Role Motivation

Prepare specific examples of a challenging project and leadership, then connect genuine interests to verified role responsibilities.

Behavioral & LeadershipProject Deep DiveLeadership & Influence

Implement Checksums and Feature Rollout Evaluation

Complete the following two coding tasks in a 90-minute online assessment. An AI coding assistant may be available, but the submitted code must pass th...

Coding & AlgorithmsGraphsDebugging

Machine Learning Engineer

Implement Simple Linear Regression with Gradient Descent from Scratch

Write simple linear regression trained with gradient descent, from scratch. Given training inputs x (one feature per example) and targets y, learn a s...

Machine LearningML CodingML Fundamentals

45 people solved

Sep 11, 2026

GoogleEPAM SystemsBloomberg

Hard

Software Engineer

Build the Shortest Palindrome by Prepending Only

Problem Add characters only in front of s to make it a palindrome. Return the shortest resulting palindrome. Preserve all existing characters and thei...

Coding & AlgorithmsString AlgorithmsArrays & Strings

13 people solved

Amazon

Medium

Software Engineer Locked

Grid Reachability for a Robot That Cannot Reverse and Has Restricted Turns

Decide whether a robot on a grid with blocked cells can travel from a start cell to a destination when it may never reverse direction and may only mak...

Coding & AlgorithmsGrids & MatricesGraphs

Expected Number of Same-Rank Pairs in a Hand Dealt Without Replacement

A deck contains $M$ ranks with $N$ cards of each rank, so it holds $MN$ cards in total. You are dealt $K$ cards from the shuffled deck, without replac...

Statistics & MathProbabilityPuzzles & Brainteasers

Design a Superhero Dispatch System

Design the backend for a superhero rescue marketplace — a dispatch platform that connects civilians in distress with nearby superheroes. Civilians rep...

System DesignGeo & Delivery SystemsDistributed Transactions & Idempotency

Software Engineer Locked

Convert Leveled Rich-Text Tokens into Nested Lists

Convert ordered rich-text tokens with positive depth levels into the specified nested-list representation while preserving text order. The exercise pr...

Coding & AlgorithmsStacks & Queues

530 people solved

Jul 21, 2026

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Tech Interview Questions

Count Straight-Line Occurrences of a Word in a Letter Grid, Rows and Columns Only

Determine Whether the Last Array Index Is Reachable by Forward Jumps

Implement a Dependency-Aware Task Scheduler

Improve Training With Noisy Annotators

Find Values Repeated in Three Consecutive Log Rows

Implement 2048 Board Tilts in Four Directions with Merging and Game-Over Detection

Design Power-Grid Device Monitoring over Unreliable Networks: Dedup and Late Events

Data Science Project You Are Most Proud Of: Stakeholders, Impact and Hindsight

Explain What a Database Index Is: Lookups, Composite Keys and Write Trade-offs

Hotel Vending Machine Product Design: Guest Segment, Features and Success Metrics

Implement Notification Rate Limiter

Build a Live API-Connected DAG Workflow for Late-Order Refund Requests

Discuss a Challenging Project, Leadership Evidence, and Role Motivation

Implement Checksums and Feature Rollout Evaluation

Implement Simple Linear Regression with Gradient Descent from Scratch

Build the Shortest Palindrome by Prepending Only

Grid Reachability for a Robot That Cannot Reverse and Has Restricted Turns

Expected Number of Same-Rank Pairs in a Hand Dealt Without Replacement

Design a Superhero Dispatch System

Convert Leveled Rich-Text Tokens into Nested Lists

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