Tech Interview Questions

Practice the exact questions companies are asking right now.

Questions

12.1k

Companies

579

Updated

10.10.2026

12.1k Questions 579 Companies10.10.2026

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

Applied Intuition

Medium

Software Engineer Locked

Build message schema parser with size/type queries

This question evaluates parsing of a simple message schema, construction of mappings from field names to primitive types and byte sizes, and computati...

Ensure thread-safe updates to org hierarchy

Ensure thread-safe updates to org hierarchy Thread-safe Organization Hierarchy: API, Concurrency, and Consistency Context You are building an in-memor...

Software EngineerIntern

Solve three algorithmic OA problems

This is an online assessment (Codility-style, 150 minutes) consisting of three independent coding problems. Solve each one separately; they do not sha...

Coding & AlgorithmsBacktracking & RecursionBit Manipulation

Count substrings and generate TOC

Solve the following two coding problems. 1. Count valid binary substrings Given a string s consisting only of '0' and '1', count how many substrings s...

Data Scientist Locked

Implement np.random.choice

This question evaluates understanding of random sampling algorithms, probability distributions (uniform and weighted), handling of weights and edge-ca...

Implement multi-head self-attention correctly

Implement Multi-Head Self-Attention (from scratch) Context You are given an input tensor X with shape (batch_size, seq_len, d_model). Implement a mult...

Machine LearningTransformers & AttentionML Coding

Design a local activity counter service

System Design: Near-Real-Time Activity Counting Service Context Build a service that ingests high-throughput client events and provides near-real-time...

System DesignBatch & Stream ProcessingData Ingestion & CDC

Explain and Compare SGD and Adam

Explain and Compare SGD and Adam Explain how stochastic gradient descent updates model parameters and how Adam modifies those updates using moving est...

Machine Learning

40 people solved

Apr 20, 2026

Design a distributed job scheduler

Question Design a distributed job scheduler that can run background jobs at specific times or on recurring schedules (similar to cron but scalable and...

System DesignJob Scheduling & WorkflowsDistributed Coordination

Software EngineerIntern

Trace and Debug Agent Tool-Call Failures

An agent fails or receives an exception while calling an external tool. The visible result does not show whether the failure occurred while preparing ...

System DesignObservabilityAPI Integration & HTTP Clients

Design log-query stream processor

Design log-query stream processor Stream Processor: Query Registration and Log Tagging Context You are designing a streaming component that ingests a ...

System DesignString AlgorithmsData Structure Design

Software EngineerNew Grad

Design an In-Memory Pub-Sub Model

Design an object-oriented, in-memory publish-subscribe model. Requirements: - A publisher can publish a message to a topic. - A subscriber can subscri...

Software Engineering FundamentalsLow-Level Design (OOP)Concurrency

303 people solved

Apr 10, 2026

Validate abbreviations and brackets

The coding round included two short implementation problems: 1. Abbreviation validation Given a lowercase word word and a string abbr, determine wheth...

Find shortest path in a Fibonacci-ordered tree

You are given a recursively-defined binary tree T(order) whose shape depends only on order (not on node values). Nodes are labeled 0..N-1 using preord...

Coding & AlgorithmsTrees

Machine Learning Engineer

Implement Multi-Head Attention with a KV Cache and Cached Grouped-Query Attention

Implement the attention layer of a decoder-only transformer from scratch, in three steps that build on each other: standard multi-head attention, a ke...

Machine LearningTransformers & AttentionML Coding

Design and Debug a Point-in-Time Backtest Data Pipeline

Practice diagnosing a point-in-time financial backtest pipeline, from identifier resolution and vendor backfills to stale data, outliers, and look-ahe...

Software Engineer Locked

Build span trees from unordered trace spans

This question evaluates skill in reconstructing hierarchical relationships from unordered span records, testing understanding of tree structure assemb...

Coding & AlgorithmsTrees

Text Editor with a Cursor: Typing, Backspace, and Four-Way Cursor Movement

Implement a TextEditor class that holds one document and a cursor. The cursor sits between two characters, or at the start or end of the text, and eve...

Software Engineering FundamentalsData Structure DesignStacks & Queues

Frontend Engineer Locked

Design Calendar Frontend State for Recurring Events

Design frontend state and APIs for a calendar with bounded views, recurring series, and single-occurrence rescheduling. Separate normalized server dat...

Software Engineer Locked

Implement type AST and infer generics

This question evaluates a candidate's ability to design an abstract syntax tree representation and implement generic type inference for a small langua...

Coding & AlgorithmsParsing & Interpreters

443 people solved

Feb 11, 2026

Tech Interview Questions

Build message schema parser with size/type queries

Ensure thread-safe updates to org hierarchy

Solve three algorithmic OA problems

Count substrings and generate TOC

Implement np.random.choice

Implement multi-head self-attention correctly

Design a local activity counter service

Explain and Compare SGD and Adam

Design a distributed job scheduler

Trace and Debug Agent Tool-Call Failures

Design log-query stream processor

Design an In-Memory Pub-Sub Model

Validate abbreviations and brackets

Find shortest path in a Fibonacci-ordered tree

Implement Multi-Head Attention with a KV Cache and Cached Grouped-Query Attention

Design and Debug a Point-in-Time Backtest Data Pipeline

Build span trees from unordered trace spans

Text Editor with a Cursor: Typing, Backspace, and Four-Way Cursor Movement

Design Calendar Frontend State for Recurring Events

Implement type AST and infer generics

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