Tech Interview Questions

Practice the exact questions companies are asking right now.

Questions

12.2k

Companies

569

Updated

10.14.2026

12.2k Questions 569 Companies10.14.2026

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

Hebbia

Medium

Software Engineer

Design a Multi-Agent Chat Backend

Design the backend for an LLM-powered chat product used by customers in a financial-technology setting. The interviewer will show a simple demo of a c...

Machine Learning Engineer

Design App Store search

Design the search system for a mobile app marketplace similar to an app store. Users enter short queries such as 'photo editor', 'budget tracker', or ...

ML System Design

93 people solved

Dec 17, 2025

Design batch and streaming ETL architecture

Design batch and streaming ETL architecture System Design: End-to-End Data Platform for Product Analytics (Batch + Near-Real-Time) Context Design a sc...

System DesignETL & Data PipelinesBatch & Stream Processing

Software EngineerNew Grad

How Would You Optimize a Program

You are given an existing program that produces correct results but is too slow in production. Describe a structured plan to optimize it. Your answer ...

System DesignDebuggingMemory Management

Answer leadership and ambiguity scenarios

Question Answer the following behavioral & leadership questions with concrete examples. Use a structured format such as STAR (Situation, Task, Actions...

Behavioral & LeadershipLeadership & InfluenceConflict & Collaboration

247 people solved

Jan 1, 2026

Hard

Software EngineerSenior+

Scheduling Four Apps at Once on Kubernetes and a Node-Feedback Scheduler Plugin

You are in a technical-depth interview for a senior backend infrastructure role on a team that runs its workloads on Kubernetes. After some discussion...

System DesignContainers & OrchestrationJob Scheduling & Workflows

Data Scientist Locked

Explain an End-to-End ML Project to Mixed Audiences

Prepare an end-to-end ML project deep dive that covers problem framing, leakage-safe validation, a real challenge, deployment or handoff, impact, limi...

Behavioral & Leadership

Debug a cache incident end-to-end

Incident Scenario: Elevated Latency and Surge in Cache Misses You are paged for elevated tail latency and a spike in cache misses in a microservice th...

Software Engineering FundamentalsDebuggingCaching

Data Scientist Locked

Measure causal impact of YouTube ads

Estimate the incremental sales effect of a 6-week YouTube campaign, explain why regressing weekly sales on ad spend is biased, and design and size a g...

Analytics & ExperimentationCausal InferenceExperiment Design (A/B Testing)

Make Every Password Block a Palindrome

Implement minimum_palindromic_block_changes(password, k). The password length is a multiple of k. Partition it into consecutive blocks of exactly k ch...

How did you handle an ethical issue?

Describe a time when you encountered an ethical issue at work. What was the situation, why was it ethically sensitive, what options did you consider, ...

Behavioral & LeadershipEthics & Responsibility

Design a high-throughput distributed rate limiter

Question Design a high-throughput, distributed rate-limiting service that runs across multiple regions with low latency and burst tolerance. The servi...

System DesignRate LimitingPartitioning & Consistent Hashing

Design an object-oriented parking lot system

Design an object-oriented model for a parking lot management system. Requirements: - The parking lot has multiple levels; each level has multiple park...

Software Engineering FundamentalsLow-Level Design (OOP)

Explain ROC-AUC vs PR-AUC tradeoffs

Question You trained a binary classifier that outputs predicted probabilities. Compare ROC-AUC and PR-AUC (the latter usually reported as Average Prec...

Machine LearningModel Evaluation

Minimize image processing cost with discount

Question You have n images. For the i-th image, processing costs filterCost[i] per day and must run from startDay[i] to endDay[i] inclusive. Each day ...

Coding & AlgorithmsIntervals & SchedulingGreedy

Software EngineerNew Grad

Track Island Counts as Land Is Added

Track Island Counts as Land Is Added Problem Implement trackIslandCounts(grid, additions) -> counts. grid is a rectangular array containing 0 for wate...

Software Engineer Locked

Design a Merchant Ledger Service

This question evaluates system design skills related to modeling monetary values, transactional integrity, idempotency, auditability, concurrency cont...

System DesignPayments & LedgersDistributed Transactions & Idempotency

Software EngineerNew Grad

Maximum-Sum Star with at Most K Arms

Given a simple undirected graph with an integer value on each node and an integer k, return the largest node-value sum of any nonempty star subgraph w...

Coding & AlgorithmsGraphsGreedy

Design a Multimodal Training Data Pipeline

Design a backend system for collecting, filtering, and storing training data sent by many clients. Clients upload records that may include large media...

Implement streaming CTR with deduplication

Implement a Python function to compute streaming, per-campaign CTR over a sliding 24-hour window with click de-duplication and late-arriving events. R...

Coding & AlgorithmsBatch & Stream ProcessingArrays & Strings

123 people solved

Oct 13, 2025

Tech Interview Questions

Design a Multi-Agent Chat Backend

Design App Store search

Design batch and streaming ETL architecture

How Would You Optimize a Program

Answer leadership and ambiguity scenarios

Scheduling Four Apps at Once on Kubernetes and a Node-Feedback Scheduler Plugin

Explain an End-to-End ML Project to Mixed Audiences

Debug a cache incident end-to-end

Measure causal impact of YouTube ads

Make Every Password Block a Palindrome

How did you handle an ethical issue?

Design a high-throughput distributed rate limiter

Design an object-oriented parking lot system

Explain ROC-AUC vs PR-AUC tradeoffs

Minimize image processing cost with discount

Track Island Counts as Land Is Added

Design a Merchant Ledger Service

Maximum-Sum Star with at Most K Arms

Design a Multimodal Training Data Pipeline

Implement streaming CTR with deduplication

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