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

Apple

Hard

Software Engineer

Implement a Thread-Safe Event Tracker Over a Sliding Time Window

Implement an in-memory event system that records events as they happen and answers questions about the events that fall inside a fixed time window end...

Software Engineering FundamentalsData Structure DesignConcurrency

Software Engineer Locked

Return the Earliest ID Seen Exactly Once

Maintain the earliest single-visit ID with counts and queue pruning, handling permanent duplicates, empty results, and strict versus amortized constan...

Coding & AlgorithmsData Structure DesignLinked Lists

Quantitative Researcher

Total Rainwater Trapped Above an Elevation Profile of Unit-Width Bars

An elevation profile is made of vertical bars of width 1 standing side by side on flat ground. After heavy rain, water collects in the dips between ba...

Coding & AlgorithmsTwo Pointers & Sliding WindowArrays & Strings

28 people solved

Sep 25, 2026

AmazonGoogleMicrosoft

Hard

Software Engineer

Evaluate Parenthesized Sums with Unary Minus

Problem Evaluate a valid expression containing decimal numbers, plus, minus, parentheses and spaces. Unary minus is allowed; unary plus is not. Do not...

Coding & AlgorithmsStacks & QueuesParsing & Interpreters

17 people solved

AmazonGoogleBloomberg

Hard

Software Engineer

Measure Rainwater Held Between Bars

Problem The array heights describes a row of adjacent vertical bars on level ground. Bar i has height heights[i], and every bar is one unit wide. Retu...

Coding & AlgorithmsTwo Pointers & Sliding WindowDynamic Programming

Design a customer support agent dispatcher that handles mid-request breaks

Design and implement the core of a dispatcher for a customer support team. Customers contact support and wait for help. Human support agents sign in, ...

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

Software Engineer Locked

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

Implement an event counter that returns how many events occurred in the trailing 15 minutes, using a fixed-size ring buffer of per-second buckets so m...

Software Engineering FundamentalsData Structure Design

Count Days until a Strictly Warmer Reading

Problem For each day, return how many days pass before the first later temperature strictly greater than that day's reading. Return zero when there is...

Coding & AlgorithmsStacks & QueuesArrays & Strings

In-Memory Per-Second API Rate Limiter: Accept or Reject Each Request

An API endpoint is protected by an in-memory rate limiter. The limiter is created with one value, max_per_second, the largest number of requests it le...

Coding & AlgorithmsRate LimitingData Structure Design

Machine Learning Engineer

Evaluate an Integer Arithmetic Expression String With Operator Precedence

Given a string s that holds a valid arithmetic expression, return its integer value. The expression contains non-negative integers, the binary operato...

Coding & AlgorithmsParsing & InterpretersStacks & Queues

Aggregate Element Counts in Nested Formulas

Problem Parse a valid chemical formula. An element name begins with an uppercase English letter followed by zero or more lowercase letters. A followin...

Coding & AlgorithmsParsing & InterpretersStacks & Queues

String Remaining After Equal-Neighbor Erasure

Problem Starting with lowercase string s, repeatedly erase an adjacent pair of equal letters until no such pair remains. Return the final string. The ...

Coding & AlgorithmsStacks & QueuesArrays & Strings

Remove the Fewest Parentheses to Restore Validity

Problem Remove as few parentheses as possible from s so the parentheses in the result are balanced: every prefix has at least as many opening as closi...

Coding & AlgorithmsStacks & QueuesGreedy

Height of the First Strictly Taller Building to the Right of Each Building

A row of buildings is given as their heights, listed from left to right. For each building, find the first building to its right that is strictly tall...

Coding & AlgorithmsStacks & Queues

Software EngineerSenior+ Locked

Flatten Nested Objects and Lists into Full Leaf Paths

Traverse nested maps and lists with a stack, include every parent key and list index, and return deterministically ordered paths to string leaves.

Coding & AlgorithmsTreesStacks & Queues

Software EngineerSenior+

Design a walk-in service scheduler with VIP priority and a 2:1 VIP-to-regular rate

Design and implement a service scheduler for an in-person customer service center, similar to a walk-in tech support counter in a retail store. A cust...

Software Engineering FundamentalsLow-Level Design (OOP)Stacks & Queues

Name-Keyed Async Task Scheduler with Sequential Lanes, Cancel and Clear by Name

Create a task scheduler for asynchronous functions, built in the style of an event emitter. Each task is submitted under a name together with an async...

Software Engineering FundamentalsJavaScript & TypeScriptConcurrency

52 people solved

Aug 31, 2026

AmazonMicrosoftGoogle

Hard

Software Engineer

Measure the Largest All-One Grid Rectangle

Problem The rectangular grid bits contains the characters 0 and 1. Return the largest area of an axis-aligned rectangle made entirely of 1 cells. Such...

Coding & AlgorithmsGrids & MatricesStacks & Queues

Sum of the Node Values on a Binary Tree's Boundary

Picture walking around the outside of a binary tree, starting at the root: you go down the left edge, along the leaves at the bottom from left to righ...

Coding & AlgorithmsTrees

Validate Parentheses with Optional Wildcard Characters

Problem Return whether s can become a balanced parenthesis string by independently treating each * as (, ), or the empty string. Every closing parenth...

Coding & AlgorithmsGreedyStacks & Queues

16 people solved

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Tech Interview Questions

Implement a Thread-Safe Event Tracker Over a Sliding Time Window

Return the Earliest ID Seen Exactly Once

Total Rainwater Trapped Above an Elevation Profile of Unit-Width Bars

Evaluate Parenthesized Sums with Unary Minus

Measure Rainwater Held Between Bars

Design a customer support agent dispatcher that handles mid-request breaks

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

Count Days until a Strictly Warmer Reading

In-Memory Per-Second API Rate Limiter: Accept or Reject Each Request

Evaluate an Integer Arithmetic Expression String With Operator Precedence

Aggregate Element Counts in Nested Formulas

String Remaining After Equal-Neighbor Erasure

Remove the Fewest Parentheses to Restore Validity

Height of the First Strictly Taller Building to the Right of Each Building

Flatten Nested Objects and Lists into Full Leaf Paths

Design a walk-in service scheduler with VIP priority and a 2:1 VIP-to-regular rate

Name-Keyed Async Task Scheduler with Sequential Lanes, Cancel and Clear by Name

Measure the Largest All-One Grid Rectangle

Sum of the Node Values on a Binary Tree's Boundary

Validate Parentheses with Optional Wildcard Characters

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