PracHub
QuestionsExperienceLearningGuidesInterview PrepGreen Card
PracHub

Master your tech interviews with 10,000+ real questions from top companies.

Product

  • Questions
  • Learning Tracks
  • Interview Guides
  • Resources
  • Green Card Tracker
  • Premium
  • Practice with AI agents
  • For Universities

Browse

  • By Company
  • By Role
  • By Category
  • Topic Hubs
  • Interview Experiences
  • SQL Questions
  • AI Coding Questions
  • Compare Platforms
  • Discord Community

Support

  • support@prachub.com
  • (916) 541-4762

Legal

  • Privacy Policy
  • Terms of Service
  • About Us

© 2026 PracHub. All rights reserved.

Tech Interview Questions

Practice the exact questions companies are asking right now.

Questions
100
Companies
579
Updated
10.10.2026
100 Questions 579 Companies10.10.2026
PLTCHK testimonial
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_ testimonial
_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"

Chris testimonial
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 testimonial
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."

Jake testimonial
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 testimonial
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."

Carlos testimonial
CarlosFull Stack, Shopify

"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."

boba.tea.vibes testimonial
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."

Andy testimonial
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 testimonial
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."

Shruti testimonial
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 testimonial
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."

Bianca testimonial
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 testimonial
tambrahm007

"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."

toa testimonial
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 testimonial
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_ testimonial
_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"

Chris testimonial
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 testimonial
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."

Jake testimonial
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 testimonial
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."

Carlos testimonial
CarlosFull Stack, Shopify

"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."

boba.tea.vibes testimonial
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."

Andy testimonial
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 testimonial
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."

Shruti testimonial
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 testimonial
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."

Bianca testimonial
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 testimonial
tambrahm007

"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."

toa testimonial
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 50 results
Snapchat logo
Snapchat
Medium
Software Engineer Locked

Find Duplicate Files with a Hand-Written Directory Traversal

Build a duplicate-file finder without recursive walking helpers. This exercise covers iterative directory traversal, bounded-memory content comparison...

Software Engineering FundamentalsTreesOperating Systems
13
1
90 people solved
Jul 21, 2026
Cohere logo
Cohere
Medium
Data Engineer Locked

Design a Conversation Log Ingestion Pipeline

This question evaluates a data engineer's competency in designing robust daily ingestion and ETL pipelines for conversation logs, covering schema and ...

System DesignETL & Data PipelinesBatch & Stream Processing
17
0
169 people solved
May 30, 2026
Salient Ai logo
Salient Ai
Hard
Software EngineerSenior+

Find Duplicate Files by Content with Efficient I/O

Using supplied filesystem helpers, design an operation that finds files with identical contents. Explain how to reduce unnecessary file reads and memo...

Software Engineering FundamentalsFile & Media StorageOperating Systems
2
0
22 people solved
Aug 3, 2026
Ninjatrader logo
Ninjatrader
Hard
Software Engineer

Server Log Analyzer: Parse JSON Lines, Summarize Latency, Flag Per-Minute Anomalies

Complete a small server-log analyzer in Python. The online IDE provides three files: server.log (a sample log), analyzer_stub.py (skeleton code with t...

Software Engineering FundamentalsObservabilityBatch & Stream Processing
1
0
13 people solved
Sep 9, 2026
Nubank logo
Nubank
Medium
Software EngineerSenior+ Locked

Design Chargeback Ingestion and CSV Delivery

Design a chargeback ingestion system with validation, deduplication, efficient batch reads, immutable CSV exports, and recoverable FTP or SFTP deliver...

System DesignPayments & LedgersDistributed Transactions & Idempotency
12
0
164 people solved
Sep 2, 2026
Crusoe logo
Crusoe
Easy
Software Engineer Locked

Design a Slack-Like Messaging Platform

This question evaluates a candidate's competency in designing scalable, low-latency distributed messaging architectures, covering conversation modelin...

System DesignReal-Time SystemsMessaging & Event-Driven
29
0
302 people solved
May 2, 2026
Mistral AI logo
Mistral AI
Hard
Software Engineer

Design a PDF-to-Markdown Inference API

Problem Statement Design an inference service that converts PDF files into Markdown. Assume the following building blocks already exist and you do not...

ML System DesignGPU InfrastructureMessaging & Event-Driven
70
0
1160 people solved
Apr 16, 2026
OpenAI logo
OpenAI
Medium
Software Engineer Locked

Design Slack-like multi-tenant global messaging system

This question evaluates a candidate's ability to design large-scale, multi-tenant real-time messaging systems, testing competencies in distributed sys...

System DesignReal-Time SystemsAuthentication & Authorization
21
0
157 people solved
Dec 1, 2025
J.P. Morgan logo
J.P. Morgan
Medium
Software Engineer II Locked

Design Secure Token Authorization and Large-File Transfer

Design token-based authentication and authorization alongside resumable large-file transfer, covering scoped claims, server-side policy checks, bounde...

System Design
3
0
33 people solved
Aug 8, 2026
Oracle logo
Oracle
Medium
Backend EngineerSenior+ Locked

Design a High-Volume Healthcare Data Ingestion Pipeline

Design a high-volume healthcare ingestion pipeline for sensitive, duplicated, malformed, and versioned partner data, covering validation, replay, faul...

System Design
1
0
16 people solved
Aug 10, 2026
Cognitiv logo
Cognitiv
Hard
Software Engineer Locked

Reason About Duplicate Data and Scaling in Spark

Explain how to define and remove duplicate data in Spark, then scale the pipeline as volume and traffic increase. Candidates must translate business i...

Software Engineering Fundamentals
3
0
40 people solved
Jul 28, 2026
Confluent logo
Confluent
Medium
Software EngineerSenior+

Solve Signature, File, and Queue Problems

Solve the following interview-style problems: 1. Function signature matching You are given a registry of function definitions. Each function has an...

Coding & AlgorithmsData Structure DesignOperating Systems
22
0
207 people solved
Feb 22, 2026
Amazon logo
Amazon
Medium
Software EngineerNew Grad

Search a Unix-Like File Tree with Composable Filters

Problem Search an in-memory Unix-like file tree from a given directory. Return every physical file whose name contains a query string and whose size i...

Coding & Algorithms
2
0
35 people solved
Mar 12, 2026
OpenAI logo
OpenAI
Hard
Software Engineer

Implement a persistent sharded key-value store

Problem Implement a simple key–value store that persists data on disk. You must store the data in fixed-size shards, where each shard is saved in one ...

Coding & AlgorithmsKey-Value Stores
94
1
1199 people solved
Nov 24, 2025
OpenAI logo
OpenAI
Medium
Software Engineer Locked

Build a File-Backed Key-Value Store

This question evaluates a candidate's understanding of persistent key-value storage, in-memory versus on-disk state management, serialization/deserial...

Coding & AlgorithmsKey-Value StoresFile & Media Storage
13
0
122 people solved
Apr 11, 2026
Jump Trading logo
Jump Trading
Easy
Software Engineer Locked

Identify Files That Need Synchronization

Identify source files requiring synchronization by parsing metadata, checking source readability, destination presence and writability, and size or mo...

Coding & Algorithms
20
0
169 people solved
Aug 12, 2026
Airbnb logo
Airbnb
Medium
Software Engineer Locked

Design a Multi-Level In-Memory Cloud Storage Service

Design staged in-memory cloud storage with prefix ranking, user capacity, merging, and conflict-aware backup and restore while surfacing unspecified s...

Software Engineering Fundamentals
9
0
65 people solved
Aug 25, 2026
Amazon logo
Amazon
Medium
Software Engineer Locked

Design a File Searcher With Symbolic Links

Design an in-memory file searcher that filters regular files by suffix and size while optionally following symbolic links. Define deterministic paths ...

Software Engineering FundamentalsGraphs
8
0
80 people solved
Jul 10, 2026
Anthropic logo
Anthropic
Medium
Software Engineer

Design file deduplication across nested directories

Design and implement a file deduplication tool that, given a root directory, identifies groups of duplicate files. Requirements: traverse nested direc...

Coding & AlgorithmsFile & Media Storage
29
0
271 people solved
Aug 14, 2025
Intuit logo
Intuit
Medium
Software Engineer

Find largest filename from ls -l output

You are given a multi-line string (via stdin) that represents the output of ls -l, with one entry per line. Each file line follows the typical ls -l f...

Coding & AlgorithmsParsing & Interpreters
5
0
97 people solved
Oct 13, 2025
Anthropic logo
Anthropic
Medium
Software Engineer Locked

Implement crawler and file deduplication

This question evaluates competencies in concurrent programming, web crawling and graph traversal, thread safety, rate limiting, I/O-efficient file ded...

Coding & AlgorithmsConcurrencyAPI Integration & HTTP Clients
16
0
134 people solved
Feb 28, 2026
Amazon logo
Amazon
Hard
Software Engineer

Design a file search module like UNIX find

Design Task: Object-Oriented module that mimics UNIX find Context Design an object-oriented library that replicates the core functionality of the UNIX...

System DesignLow-Level Design (OOP)
44
0
309 people solved
Aug 13, 2025
Anthropic logo
Anthropic
Medium
Software Engineer

Detect duplicate files by content

Detect duplicate files by content in a filesystem. Given access to a directory tree, return groups of file paths that have identical byte content. Min...

Coding & Algorithms
15
0
233 people solved
Aug 1, 2025
Charta Health logo
Charta Health
Medium
Software Engineer Locked

Design a Prefix-Suggestion Search Interface

Design a prefix-search interface over a title file, with clear matching rules, efficient lookup, accessible suggestions, and protection from stale res...

Software Engineering FundamentalsSearch & Feed SystemsState Management
4
0
61 people solved
Sep 9, 2026
Adobe logo
Adobe
Hard
Software Engineer

Design a multimodal embedding service

System Design: Multimodal Embedding Pipeline for Documents, Images, and Videos You are designing a production service that computes embeddings for use...

ML System DesignEmbeddings & Vector SearchDistributed Transactions & Idempotency
11
1
184 people solved
Sep 6, 2025
EY logo
EY
Medium
Data Scientist

Architect cloud data ingestion patterns

Propose a cloud data ingestion and serving pattern for streaming and batch on your preferred cloud (AWS/Azure/GCP). Choose between CDC, event sourcing...

Data Manipulation (SQL/Python)Data Ingestion & CDCBatch & Stream Processing
5
0
46 people solved
Oct 13, 2025
Waymo logo
Waymo
Medium
Software Engineer

Deduplicate a 256 GB File on a Machine With 128 MB of Memory

You have one file of 256 GB containing a large number of records, some of which are duplicates. The machine you run on has only 128 MB of memory. How ...

Software Engineering FundamentalsSorting
2
0
20 people solved
Sep 10, 2026
Intuit logo
Intuit
Medium
Software Engineer Locked

Find largest file in a directory using Bash

This question evaluates a candidate's proficiency with shell scripting and Unix command-line concepts, including recursive file-system traversal, reco...

Software Engineering Fundamentals
10
0
71 people solved
Feb 11, 2026
Oracle logo
Oracle
Medium
Software Engineer

Design a Video Upload Service for 100 GB Files with Chunked, Resumable Uploads

Design a system that lets users upload video files as large as 100 GB. The interviewer steered the discussion through five areas, in this order: handl...

System DesignFile & Media StorageStorage & Sharding
1
0
18 people solved
Sep 14, 2026
Abnormal Security logo
Abnormal Security
Medium
Software Engineer

Design a duplicate-file removal algorithm

Design a duplicate-file removal algorithm Your filesystem contains millions of photos. Duplicates are strictly byte-identical files (no ML/CV similari...

Coding & AlgorithmsArrays & StringsFile & Media Storage
16
0
183 people solved
Jul 16, 2025
Instacart logo
Instacart
Medium
Software Engineer Locked

Design Asset Storage System

This question evaluates proficiency in system design for scalable, durable asset storage and delivery, encompassing distributed storage, metadata mode...

System DesignFile & Media StorageCaching
16
0
226 people solved
May 30, 2026
Waymo logo
Waymo
Medium
Software Engineer

Design an Object Storage Service With Buckets, Keys and Durable Blob Storage

Design an object storage service. Clients create named buckets and, inside a bucket, store, read, list and delete objects: opaque blobs of bytes addre...

System DesignFile & Media StorageStorage & Sharding
1
0
23 people solved
Sep 10, 2026
Databricks logo
Databricks
Hard
Software Engineer

Design concurrent range-aware file caching client

Design concurrent range-aware file caching client System Design: High-throughput Client-side Ranged-read File Cache You are asked to design and specif...

System DesignCachingConcurrency
45
0
758 people solved
Aug 9, 2025
Google logo
Google
Medium
Software EngineerNew Grad Locked

Find the Most Frequent IP Addresses in a File Too Large for Memory

Design an exact, bounded-memory method for finding the most frequent IP addresses in a file far larger than RAM. Analyze memory and disk-I/O trade-off...

Software Engineering FundamentalsSorting
11
0
90 people solved
Jun 17, 2026
Harvey logo
Harvey
Medium
Software Engineer Locked

Find Duplicate Files Safely at Scale

Design a cycle-safe duplicate-file finder with buffered hashing, collision confirmation, bounded traversal state, and crash-aware behavior.

Software Engineering Fundamentals
29
0
202 people solved
Aug 12, 2026
Airwallex logo
Airwallex
Medium
Software EngineerSenior+ Locked

Design a Large-File Analysis Report System

Design an authenticated large-file upload and analysis service with resumable storage, idempotent async jobs, versioned reports, and tenant isolation.

System Design
4
0
71 people solved
Sep 2, 2026
Applied Intuition logo
Applied Intuition
Medium
Software Engineer

Build and present a minimal vehicle log playback app from S3 data in two hours

This round follows a system design round in which you designed a real-time 3D playback viewer for recorded vehicle logs. You now get read access to an...

Software Engineering FundamentalsAI-Assisted Development
1
0
17 people solved
Sep 2, 2026
Anthropic logo
Anthropic
Medium
Software Engineer

Implement file deduplication at scale

Write a program to deduplicate files in a very large directory tree. Identify groups of identical files without loading entire files into memory. Outl...

Coding & AlgorithmsFile & Media Storage
120
0
914 people solved
Sep 6, 2025
Legora logo
Legora
Medium
Software Engineer Locked

Design a Scalable File Upload and Content Extraction Pipeline

Design an asynchronous file-upload and content-extraction system for a language-model workflow, including APIs, storage, queues, workers, retries, and...

System Design
13
0
94 people solved
Jun 22, 2026
Databricks logo
Databricks
Medium
Backend EngineerSenior+

Design a Distributed File System, Scoping the Requirements Yourself

Design a distributed file system. This was a phone-screen system design question for a staff-level backend role. The report gives only the prompt itse...

System DesignFile & Media StorageConsensus & Replication
7
0
56 people solved
Sep 11, 2026
Intuit logo
Intuit
Medium
Software Engineer

Sum palindrome-change costs over all substrings

This is a three-part coding screen. Each part is independent — a string-algorithms problem, a SQL aggregation problem, and a shell-parsing problem — a...

Coding & AlgorithmsArrays & StringsSQL
28
0
326 people solved
Oct 13, 2025
Confluent logo
Confluent
Medium
Software EngineerSenior+

Implement tail -n for a Very Large File

Implement tail -n for a Very Large File Design and implement the core of tail -n: given a seekable file and a non-negative integer n, return the final...

Software Engineering FundamentalsOperating Systems
8
0
125 people solved
Jan 1, 2026
Luma logo
Luma
Medium
Software Engineer

Build a Scalable Text-to-Speech Service Prototype, Then Defend and Extend It

This prompt is one of five offered in a take-home for a software engineering role on an AI product team. The candidate picks one prompt; across the se...

System DesignSystem Design FundamentalsAI-Assisted Development
1
0
12 people solved
Sep 17, 2026
Databricks logo
Databricks
Medium
Software Engineer Locked

Design a multithreaded event logger

This question evaluates a candidate's competency in concurrent programming, synchronization primitives, ordering guarantees, and durable logging mecha...

Software Engineering FundamentalsConcurrency
48
0
384 people solved
Dec 8, 2025
Snowflake logo
Snowflake
Medium
Data Scientist

Design an analytic warehouse for event data

Design a warehouse-ready analytics data model and ingestion plan to support cohort retention, ARPU, and product-case analyses at scale (50M events/day...

Data Manipulation (SQL/Python)
1
0
16 people solved
Oct 13, 2025
Amazon logo
Amazon
Medium
Applied Scientist

Design an S3-like object storage service

Design a cloud object storage service similar to Amazon S3. The service should allow clients to upload, store, and download large files reliably and e...

System DesignFile & Media StorageStorage & Sharding
49
0
462 people solved
Dec 8, 2025
Anthropic logo
Anthropic
Medium
Software Engineer

Describe a Python design-and-coding approach in Colab

Python Coding-and-Design Exercise in Google Colab You are given an open-ended coding-and-design exercise to complete in Python, and the interviewer re...

System DesignCode Quality & MaintainabilityTesting & Quality
42
0
472 people solved
Sep 6, 2025
Apple logo
Apple
Hard
Software Engineer Locked

Design a 200-Terabyte Media Migration and Training Input Pipeline

Design a one-time transfer of 200 TB of images and videos from an on-premises environment to a cloud GPU training cluster. Connect data and model choi...

ML System Design
8
0
98 people solved
Aug 10, 2026
Microsoft logo
Microsoft
Medium
Software Engineer Locked

Design REST APIs for JSON file storage

This question evaluates system design and RESTful API skills for building JSON document storage, covering metadata modeling, concurrency control, auth...

System DesignAPI DesignFile & Media Storage
7
0
127 people solved
Jan 22, 2026
Applied Intuition logo
Applied Intuition
Medium
Software Engineer Locked

Design a Streaming TLV Message Reassembler in C

Design a secure C reassembler for out-of-order TLV packets using bounded indexes, duplicate checks, and a protocol-defined completion rule. Learn safe...

Software Engineering Fundamentals
6
0
64 people solved
Aug 14, 2026
Previous12345Next
Popular Categories
SQLBlind 75
Daily Quest

Sign in to earn XP for every problem you solve.