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

"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

ByteDance

Medium

Software EngineerNew Grad

Evaluate a Migration from MySQL to MongoDB

A team proposes migrating an existing MySQL-backed service to MongoDB. Explain how you would decide whether the migration is justified, compare the da...

Software Engineer Locked

Build a React team builder with role constraints

This question evaluates frontend React skills including component state management, enforcing role-based constraints and invariants, handling user int...

Coding & AlgorithmsReact & UI FrameworksState Management

133 people solved

Feb 11, 2026

Answer senior-level behavioral interview questions

You are interviewing for a senior machine-learning engineer role on the tech-lead track at Meta, targeting roughly the IC6+ level. This is the first-r...

Behavioral & LeadershipLeadership & InfluenceConflict & Collaboration

Compute optimal stopping in a die-rolling game

Optimal stopping with a fair die (3-roll horizon) You observe outcomes of fair six-sided die rolls (faces 1–6) and may stop after any roll to take the...

Statistics & MathPuzzles & BrainteasersProbability

Explain Technology to a Nontechnical Audience

Explain Technology to a Nontechnical Audience Choose a technical concept and explain it to a nontechnical stakeholder who needs to make a decision bas...

Behavioral & Leadership

Design classification under missingness and imbalance

30-Day Readmission Classifier: End-to-End Plan Context: You are building a binary classifier to predict 30-day readmission using claims and EHR featur...

Machine LearningSupervised LearningModel Evaluation

Software Engineer Locked

Detect overlap of two linked lists with cycles

This question evaluates understanding of linked list data structures, cycle detection techniques, pointer/reference identity, and algorithmic time/spa...

Explain vanishing gradients and activations

Explain the vanishing gradient problem in deep neural networks. In your answer: - Describe how backpropagation works at a high level and why gradients...

Machine Learning

87 people solved

Dec 8, 2025

Write SQL for call metrics

This question evaluates a candidate's competency in SQL-based data manipulation and analytics, specifically aggregations, JOINs across relational tabl...

Data Manipulation (SQL/Python)SQLMetrics & KPIs

Derive lower bound for equicorrelation rho

Equicorrelation Matrix PSD Condition Setup Consider zero-mean, unit-variance random variables whose pairwise correlations are all equal to a common va...

Statistics & MathProbability

Compute unique visitors per department from clicks

Given tables Products(product_id, department, category, subcategory) where department > category > subcategory form a hierarchy, and ClickLog(user_id,...

Data Manipulation (SQL/Python)SQL

Explain parallelism and collectives in training

Parallelism strategies and communication in large-scale training You are designing a distributed training setup for very large neural networks that ca...

ML System DesignNeural Networks & Training

Agoda: steering a travel booking platform through the Covid-19 collapse and recovery

You lead product strategy at Agoda, an online travel booking platform, when the Covid-19 pandemic arrives and travel demand collapses. Set out the str...

Product Design & StrategyProduct StrategyPrioritization & Tradeoffs

Handle missing data and outliers robustly

Customer Churn Modeling: Preprocessing, Missingness, Outliers, and Evaluation Context You are building a binary churn model for a consumer subscriptio...

Design card deck with shuffle and order

Design a playing-card deck library with two methods: shuffle() to return a uniformly random permutation of a standard 52-card deck, and order() to ret...

Coding & AlgorithmsData Structure DesignSorting

Implement left join on Python lists, no packages

Implement a left join in pure Python (no external packages, no pandas). Input: left = list of dicts with key 'id' and arbitrary other fields; right = ...

Data Manipulation (SQL/Python)Data Structure Design

Design a production face recognition system

Design an On-Device Face Recognition System for Mobile Access Control Context You are designing a face-based access control system for mobile devices ...

Machine LearningComputer VisionModel Evaluation

Maximize disjoint k-sum pairs

You are given an integer array nums and an integer k. In one operation you may remove two indices i < j if nums[i] + nums[j] == k; each index can be u...

Software Engineer AI Locked

How would you scale rule evaluation?

Design a scalable expense-policy rule engine for one million rules and thousand-record batches. Covers structured rules, predicate indexes, bitset eva...

System DesignIndexing & Query PerformanceParsing & Interpreters

161 people solved

Apr 17, 2025

Product Sense: Build a Facebook Product for Kids, From Target Age to Safety Metrics

You are a product manager at Facebook and have been asked to design a new service for children. Decide who it should serve and what it should do, take...

Product Design & StrategyProduct SenseTrust & Safety

11 people solved

Dec 31, 2025

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Tech Interview Questions

Evaluate a Migration from MySQL to MongoDB

Build a React team builder with role constraints

Answer senior-level behavioral interview questions

Compute optimal stopping in a die-rolling game

Explain Technology to a Nontechnical Audience

Design classification under missingness and imbalance

Detect overlap of two linked lists with cycles

Explain vanishing gradients and activations

Write SQL for call metrics

Derive lower bound for equicorrelation rho

Compute unique visitors per department from clicks

Explain parallelism and collectives in training

Agoda: steering a travel booking platform through the Covid-19 collapse and recovery

Handle missing data and outliers robustly

Design card deck with shuffle and order

Implement left join on Python lists, no packages

Design a production face recognition system

Maximize disjoint k-sum pairs

How would you scale rule evaluation?

Product Sense: Build a Facebook Product for Kids, From Target Age to Safety Metrics

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