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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 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
Valon logo
Valon
Hard
Software Engineer

Implement an in-memory SQL-like table

Implement a simplified in-memory SQL-like database for a single table. You should support the following operations on a table with a fixed schema (a l...

Coding & AlgorithmsData Structure Design
22
0
395 people solved
Feb 17, 2026
DoorDash logo
DoorDash
Hard
Data Scientist

Design and analyze a switchback experiment

Design and Analyze a Switchback Experiment: Reducing Cold-Food Incidents for Bike Couriers You are a data scientist on a delivery-marketplace team. A ...

Analytics & ExperimentationExperiment Design (A/B Testing)Experiment Analysis & Readout
77
0
520 people solved
Oct 13, 2025
Generalmotors logo
Generalmotors
Medium
Software EngineerSenior+ Locked

Diagnose N+1 Queries and Design a Correct Service Cache

Explain N+1 query patterns, joins and batch fetching, cache keys, freshness, stampede control, and end-to-end performance validation.

Software Engineering FundamentalsIndexing & Query PerformanceCaching
4
0
46 people solved
Aug 30, 2026
Scale AI logo
Scale AI
Easy
Software Engineer Locked

Present a Metrics-Driven Technical Project

Present a real technical project so a general software-engineering audience can understand its problem, architecture, tradeoffs, and impact. Clarify y...

Behavioral & Leadership
15
0
104 people solved
Jul 27, 2026
Optiver logo
Optiver
Hard
Software Engineer

Design a topic-based news subscription system

Topic-Based News Subscription Service — Design and Implementation Context Build an in-memory service that manages subscribers and delivers relevant ne...

System DesignSearch & Feed SystemsRate Limiting
90
0
1577 people solved
Sep 6, 2025
DoorDash logo
DoorDash
Medium
Software Engineer Locked

Design an Alert Notification Service for Downstream Consumers

Design an alert service that accepts producer events and delivers each one independently to matching downstream consumers. The architecture must isola...

System DesignMessaging & Event-DrivenDistributed Transactions & Idempotency
69
0
510 people solved
Aug 4, 2026
Axon logo
Axon
Medium
Software EngineerSenior+

Design camera-footage upload with custody chain

System design prompt You’re building a backend service for uploading recorded body-camera / dashcam footage from client devices (often on unreliable n...

System DesignFile & Media StorageApplication Security
48
1
832 people solved
Feb 11, 2026
Glean logo
Glean
Hard
Software Engineer

Search Words in a Character Grid

You are given a 2D grid board of lowercase English letters with m rows and n columns. A word can be constructed from letters of sequentially adjacent ...

Coding & AlgorithmsBacktracking & RecursionGrids & Matrices
12
0
235 people solved
Apr 15, 2026
eBay logo
eBay
Easy
Applied Scientist

Design fast query-to-listing retrieval over tens of millions of listings

Users type free-text search queries into a marketplace, and the catalog holds tens of millions of listings. Design how the system quickly retrieves th...

ML System DesignRetrieval & Candidate GenerationSearch & Feed Systems
2
0
16 people solved
Sep 24, 2026
Tekion logo
TekionGoogleMicrosoftOracle

Also asked at Microsoft, Oracle

Hard
Software Engineer

Minimize the Diameter after Joining Two Trees

Problem You are given two undirected trees. The first has n nodes labeled 0 through n - 1, and the second has m nodes labeled 0 through m - 1. The row...

Coding & AlgorithmsTrees
0
0
10 people solved
Rippling logo
Rippling
Medium
Software Engineer Locked

Design a Data-Driven Expense Rule Evaluator

Design an expense-policy evaluator whose rules are stored as validated JSON so policies can be added or changed without deploying code. Make the API o...

Software Engineering FundamentalsParsing & Interpreters
29
0
252 people solved
Jul 27, 2026
Google logo
GoogleMicrosoftAmazonMeta

Also asked at Amazon, Meta

Hard
Software Engineer

Longest Proper Prefix That Is Also a Suffix

Problem Return the longest nonempty prefix of s that is also a suffix, excluding s itself. The prefix and suffix occurrences may overlap. Return the e...

Coding & AlgorithmsString Algorithms
0
0
10 people solved
Google logo
GoogleMetaAmazon

Also asked at Amazon, Bloomberg, Microsoft, Swiggy, Starbucks

Medium
Software Engineer

Measure Immediate Deliveries among Customers’ First Orders

Problem Return immediate_percentage: the percentage of customers whose first order was immediate, rounded to two decimal places. An order is immediate...

Data Manipulation (SQL/Python)SQL
1
0
8 people solved
Discord logo
Discord
Medium
Software EngineerSenior+ Locked

Design a Local Leader Election System

This question evaluates distributed systems skills—specifically leader election, failure detection, state propagation, and the ability to design and i...

System DesignDistributed CoordinationFault Tolerance & Failover
18
1
323 people solved
May 16, 2026
Capital One logo
Capital One
Medium
Software EngineerSenior+

Simulate a Bank Ledger With Validated Transfers, Deposits and Withdrawals

A retail bank's core system keeps every account's balance in memory and must apply a stream of customer requests strictly in the order they arrive. Ea...

Coding & AlgorithmsSimulation & State Machines
2
0
25 people solved
Apr 19, 2026
Anthropic logo
Anthropic
Hard
Software Engineer Locked

Design guardrails and fallback for LLM reliability

This question evaluates a candidate's ability to design safety and reliability layers for LLM-driven production systems, covering guardrails, input/ou...

System DesignLLM ApplicationsFault Tolerance & Failover
84
1
876 people solved
Feb 11, 2026
Meta logo
Meta
Hard
Software Engineer Locked

Resolve Ambiguous Requirements Before Building

Practice answering an engineering behavioral question about ambiguous or incomplete requirements without inventing product behavior. Use a concrete de...

Behavioral & Leadership
8
0
65 people solved
Aug 3, 2026
Harvey logo
Harvey
Medium
Software Engineer Locked

Evaluate Symbol Expressions

This question evaluates the ability to parse and evaluate arithmetic expressions with symbol references, perform recursive dependency resolution, and ...

Coding & Algorithms
14
1
193 people solved
May 2, 2026
Meta logo
Meta
Medium
Software Engineer

Design a Real-Time Chat Service for One-to-One and Group Messaging

Design a real-time messaging service for a social network's chat product. Users exchange text messages in one-to-one conversations and in group conver...

System DesignReal-Time SystemsDistributed Transactions & Idempotency
4
0
33 people solved
Sep 14, 2026
Nuro logo
Nuro
Medium
Software Engineer Locked

Build a Concurrent Recurring Job Scheduler

Design a thread-safe recurring job scheduler with concurrent schedule and deschedule operations. Specify timing semantics, cancellation races, stale e...

Software Engineering Fundamentals
7
0
99 people solved
May 26, 2026
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