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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 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
C3 AI logo
C3 AI
Medium
Data Scientist

Explain key ML/stats concepts

Explain key ML/stats concepts You are taking an ML/Stats screening with conceptual multiple-choice questions. Answer the following: 1. CNN vs. RNN ...

Machine Learning
4
0
78 people solved
Jul 25, 2025
Trexquant logo
Trexquant
Medium
Software Engineer

Maintain median of a data stream

Design a data structure that supports: - addNum(int x): Add an integer from a stream. - findMedian(): Return the median of all inserted numbers so far...

Coding & Algorithms
14
0
107 people solved
Sep 1, 2025
Amazon logo
Amazon
Medium
Software Engineer

Design object model for an elevator system

Design the object-oriented model for an elevator (lift) system in a multi-floor building that may have multiple elevators. The system should support: ...

Software Engineering FundamentalsLow-Level Design (OOP)Simulation & State Machines
14
0
107 people solved
Oct 31, 2025
Startups.Com logo
Startups.Com
Medium
Machine Learning Engineer

Design efficient Transformer inference with KV cache

You are implementing autoregressive inference for a decoder-only Transformer. 1) Explain what the KV cache is, what tensors are cached per layer, and ...

ML System DesignLLM Inference & ServingTransformers & Attention
14
0
149 people solved
Mar 10, 2026
Google logo
Google
Medium
Software Engineer Locked

Reconstruct original array from doubled shuffle

This question evaluates array manipulation, multiset/frequency reasoning, pairing logic, and careful handling of edge cases such as zeros and negative...

Coding & Algorithms
9
0
78 people solved
Jan 4, 2026
Pinterest logo
Pinterest
Medium
Machine Learning Engineer Locked

Generate all hyperparameter combinations

This question evaluates competence in combinatorial enumeration and manipulation of data structures for generating hyperparameter configurations, test...

Coding & AlgorithmsBacktracking & Recursion
14
0
140 people solved
Jan 22, 2026
TikTok logo
TikTok
Medium
Software Engineer Locked

Count distinct island shapes in a grid

This question evaluates understanding of grid-based connectivity and shape equivalence, exercising skills in graph traversal, spatial normalization, a...

Coding & AlgorithmsGrids & Matrices
8
0
83 people solved
Jan 18, 2026
Snapchat logo
Snapchat
Medium
Software Engineer Locked

Design real-time ad impression and spend tracking

This question evaluates system design and distributed systems skills, focusing on real-time event ingestion, accurate counter aggregation, low-latency...

System DesignAds SystemsData Ingestion & CDC
8
0
127 people solved
Feb 12, 2026
ByteDance logo
ByteDance
Easy
Software Engineer

Find Missing Ranges with Bounds

Given a sorted array of distinct integers nums and two integers lower and upper that define an inclusive interval [lower, upper], return all maximal r...

Coding & Algorithms
6
0
50 people solved
Feb 1, 2026
Reddit logo
Reddit
Hard
Software Engineer

Design a feature store with CI/CD and reliability

System Design: Feature Store for Offline Training and Low‑Latency Online Inference Context You are designing a feature store to support machine learni...

ML System DesignML Data Pipelines & Feature StoresMLOps & Model Serving
14
0
148 people solved
Sep 6, 2025
Lyft logo
Lyft
Hard
Data Scientist

Investigate Causes and Effects of Dynamic Pricing on ETAs

Investigate Causes and Effects of Dynamic Pricing on ETAs Lyft notices that ride wait times, or ETA, increased 20% month over month. The team suspects...

Analytics & ExperimentationMetric DiagnosticsExperiment Design (A/B Testing)
97
0
226 people solved
Jul 12, 2025
Uber logo
Uber
Medium
Software EngineerSenior+ Locked

Design a Real-Time Chat System

This system design question tests a candidate's ability to architect a scalable real-time messaging platform, focusing on transport protocol selection...

System DesignReal-Time SystemsMessaging & Event-Driven
11
0
106 people solved
Jun 19, 2026
Amazon logo
Amazon
Hard
Software Engineer Locked

Explain Aurora-style internals: WAL, MVCC, replication, recovery

This question evaluates knowledge of database storage engine and distributed database internals, covering write-ahead logging, MVCC, replication model...

Software Engineering Fundamentals
6
0
61 people solved
Jan 22, 2026
Meta logo
Meta
Medium
Data Scientist

Write SQL for hashtag source and safety rates

Write SQL for the two tasks below. Assume the schema and sample data as given, and that “today” is 2025‑09‑01. Deduplicate exact duplicates by (date, ...

Data Manipulation (SQL/Python)
2
0
31 people solved
Oct 13, 2025
Visa logo
Visa
Medium
Product Manager

Product Roadmap & Stakeholder Trade-offs

Product Roadmap Prompt: End-to-End Approach and Stakeholder Trade-offs Describe your end-to-end approach to building a product roadmap. Explain how yo...

Product / Decision MakingRoadmapping & PlanningPrioritization & Tradeoffs
28
0
188 people solved
Jul 4, 2025
Airtable logo
Airtable
Medium
Software Engineer

Implement BFS serializer and deserializer

Implement two functions, serialize(obj) -> representation and deserialize(representation) -> obj, for a Python object graph containing str, int, and d...

Coding & AlgorithmsGraphs
26
0
211 people solved
Sep 6, 2025
Amazon logo
Amazon
Medium
Software Engineer

Search target in unknown-length sorted array

You have read-only access to a sorted, increasing array-like interface of unknown length that supports get(i), which returns a valid integer for in-bo...

Coding & Algorithms
6
0
68 people solved
Sep 6, 2025
Upstart logo
Upstart
Medium
Data Scientist

Estimate Family Proportions and Explain Regression Anomalies

Estimate Family Proportions and Explain Regression Anomalies On-site Statistics Round Task Overview You are given a population of families that have e...

Statistics & MathSampling & EstimationRegression & Statistical Modeling
88
0
263 people solved
Aug 4, 2025
Microsoft logo
Microsoft
Medium
Software Engineer Locked

Return Top K Relevant Apps

This question evaluates algorithmic problem-solving around aggregation and ranking, testing skills in computing aggregated relevance scores, determini...

Coding & AlgorithmsHeaps & Priority QueuesSorting
14
0
126 people solved
Mar 16, 2026
Snapchat logo
Snapchat
Medium
Machine Learning EngineerNew Grad Locked

Explain Core ML Concepts

This question evaluates understanding of foundational machine learning and deep learning concepts, including the bias–variance decomposition, differen...

Machine Learning
7
0
82 people solved
Feb 2, 2026
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