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Tech Interview Questions

Practice the exact questions companies are asking right now.

Questions
11.9k
Companies
570
Updated
10.05.2026
11.9k Questions 570 Companies10.05.2026
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 20 results
Nuro logo
Nuro
Hard
Software Engineer

Aggregate and Query Vehicle Obstacle Data

Design a metrics aggregation and query system for road-obstacle data collected by a small fleet of vehicles. The data may include locations of surroun...

System DesignStorage & ShardingBatch & Stream Processing
1
0
21 people solved
Aug 31, 2026
Mercor logo
Mercor
Medium
Machine Learning Engineer Locked

Implement a Referral Network

This question evaluates skills in modeling and manipulating directed acyclic graphs, implementing graph-based ranking metrics (reachability and flow c...

Coding & AlgorithmsGraphsData Structure Design
17
0
186 people solved
May 2, 2026
OpenAI logo
OpenAI
Medium
Software Engineer Locked

Spreading Contagion on a Grid

This question tests graph traversal and multi-source BFS on a 2D grid, evaluating a candidate's ability to model simultaneous state propagation across...

Coding & Algorithms
18
0
157 people solved
Jun 8, 2026
Databricks logo
Databricks
Medium
Software Engineer Locked

Design a Thread-Safe Buffered Writer with a Background Flush Thread

This question assesses a candidate's ability to design a concurrent, thread-safe component that decouples fast in-memory writes from slower disk I/O u...

System DesignConcurrencyData Structure Design
90
0
1051 people solved
Jun 23, 2026
Google logo
Google
Medium
Software Engineer Locked

Expand Recursive Key-Value Placeholders in a Template

Expand %KEY% placeholders in a template, recursively resolving placeholders inside mapped values. Use memoized dependency traversal to preserve litera...

Coding & AlgorithmsGraphsParsing & Interpreters
13
0
192 people solved
Aug 4, 2026
ByteDance logo
ByteDance
Hard
Machine Learning EngineerNew Grad

Implement a Transformer Decoder from Scratch Without Starter Code

With no starter code, no skeleton and no other scaffolding, implement a transformer decoder from scratch in about 30 minutes. Write it in Python with ...

Machine LearningTransformers & AttentionML Coding
1
0
14 people solved
Aug 20, 2026
Stripe logo
Stripe
Medium
Software Engineer Locked

Build an Account Transfer Ledger

This question evaluates the ability to implement transaction processing, state management, validation of transfers (including rejects and platform len...

Coding & AlgorithmsPayments & LedgersData Structure Design
24
0
370 people solved
Mar 13, 2026
Amazon logo
Amazon
Medium
Software EngineerSenior+ Locked

Design a Scalable Metrics Monitoring System

Design a scalable monitoring platform for metric ingestion, time-series storage, dashboards, ad hoc queries, and alert evaluation. Explore series iden...

System DesignObservabilitySystem Design Fundamentals
13
0
205 people solved
Jul 23, 2026
Google logo
Google
Medium
Software Engineer

Check if all substrings are dictionary words

You are given a string s (letters only) and access to an English dictionary dict (a set of valid words). Return true if every contiguous substring of ...

Coding & AlgorithmsString Algorithms
51
0
483 people solved
Mar 11, 2026
Airbnb logo
Airbnb
Medium
Software Engineer Locked

Render Wrapped Paragraphs Inside One Text Box

Render paragraphs with independent word-wrapping widths inside one ASCII box, preserving word order while padding every line to the largest requested ...

Coding & Algorithms
8
0
87 people solved
Aug 1, 2026
Harvey logo
Harvey
Medium
Software Engineer

Implement a Formula Spreadsheet

Design and implement a small in-memory spreadsheet. The spreadsheet must support cell labels such as A1 and B10, where a label consists of uppercase l...

Coding & AlgorithmsData Structure DesignGraphs
18
1
229 people solved
Apr 11, 2026
Meta logo
Meta
Medium
Data Scientist Locked

Evaluate a Live-Stream Group Notification Under Network Effects

Design an evaluation for live-stream group notifications that measures product impact beyond clicks. Define an intent-to-treat effect, address network...

Analytics & ExperimentationExperiment Design (A/B Testing)Causal Inference
29
1
231 people solved
Jul 6, 2026
C3 AI logo
C3 AI
Medium
Data ScientistIntern

Explain the Margin View of Boosting Classification

Explain the Margin View of Boosting Classification A multiple-choice question offers these explanations for why boosting is used in classification: it...

Machine LearningSupervised LearningML Fundamentals
1
0
12 people solved
Sep 15, 2026
Databricks logo
Databricks
Hard
Software EngineerSenior+ Locked

Implement Generalized Tic-Tac-Toe

Implement generalized Tic-Tac-Toe for two players on a rectangular board with a configurable consecutive-mark winning length. Handle horizontal, verti...

Coding & AlgorithmsSimulation & State Machines
28
1
271 people solved
Jul 7, 2026
Jump Trading logo
Jump Trading
Hard
Software Engineer Locked

Design a Compact Columnar File Format

Design a simplified Parquet-like file format and specify write and read operations. Make the API or object boundaries explicit, then cover invariants,...

Software Engineering FundamentalsStorage Formats & Partitioning
8
0
105 people solved
Aug 6, 2026
Databricks logo
Databricks
Medium
Software EngineerSenior+ Locked

Design Chat Deletion Semantics Under Concurrent Sends

Design deletion semantics for a chat backend when message sends and thread deletion race across servers. Define the visible consistency contract, line...

System DesignConsistency & AvailabilityReal-Time Systems
51
1
468 people solved
Jul 14, 2026
OpenAI logo
OpenAI
Hard
Machine Learning Engineer Locked

Implement Backprop for a Tiny Network

This question evaluates understanding of backpropagation, gradient derivation, numerical stability of softmax cross-entropy, and practical implementat...

Machine LearningML CodingNeural Networks & Training
204
0
1754 people solved
Apr 3, 2026
LinkedIn logo
LinkedIn
Medium
Software EngineerSenior+ Locked

Merge Keyed N-Ary Trees

Merge two keyed N-ary trees into a fresh result while preserving the required child order and matching nodes only within the same parent. Account for ...

Coding & AlgorithmsTrees
26
0
283 people solved
Jun 11, 2026
Notion logo
Notion
Medium
Software Engineer Locked

Design a Todo List Object Model

This question evaluates object-oriented design and API modeling skills, focusing on domain modeling, class responsibilities, encapsulation, and design...

Software Engineering FundamentalsLow-Level Design (OOP)Code Quality & Maintainability
50
0
678 people solved
Jun 1, 2026
Google logo
Google
Medium
Machine Learning Engineer

Design a watch-next video recommender and derive its losses and optimizer update rules

Design the "watch next" recommendations for a large video-sharing platform. While a user is watching a video, the system chooses and orders a list of ...

ML System DesignRecommendation SystemsNeural Networks & Training
1
0
16 people solved
Aug 20, 2026
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