Tech Interview Questions

Practice the exact questions companies are asking right now.

Questions

383

Companies

980

Updated

11.12.2026

383 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

Palantir

Hard

Software Engineer

Learn an Unfamiliar SQL-Like Query Class, Then Solve Tasks with Its Map and Fold Actions

This round tests how quickly you can learn code you have never seen. You are handed a short class that implements a small SQL-like query language. Fir...

Software Engineering FundamentalsProgramming Languages

Fix a Buggy Spring Boot Movie Search Against Five Search Rules

You are given an existing Spring Boot backend that powers a movie search feature, and the search returns wrong results. The search logic is complicate...

Software Engineering FundamentalsDebuggingTesting & Quality

Calculate the Percentage of Highly Active Users by Country

Calculate the Percentage of Highly Active Users by Country The impressions table has these columns: | Column | Meaning | |---|---| | impression_id | I...

Data Manipulation (SQL/Python)SQL

Debug Failing Tests in a Django Movie Search and Filter API

You are given an existing Django project that serves a movie catalog API, together with a suite of automated tests, several of which fail. You have 60...

Software Engineering FundamentalsDebuggingTesting & Quality

SQL: Zero-Filled DAU, Rolling 30-Day MAU, and the MAU Impact of a User-ID Rehash

This SQL round for a data scientist role packed five SQL questions, each with a follow-up, into one hour. The bar was described as error-free answers,...

Data Manipulation (SQL/Python)SQL

Data Scientist Locked

SQL: Count Users With Zero or One Rides per City

Write a PostgreSQL query that counts, per city, the users who have taken zero or one ride in total, including users who never rode. Tests outer joins ...

Data Manipulation (SQL/Python)SQL

Software EngineerNew Grad

Implement Column Pruning and Filter Pushdown on a Query Plan Tree

A query engine represents a SQL query as a tree of plan nodes. You are handed such a tree and asked to "optimize" it. The interviewer does not say whi...

Software Engineering FundamentalsDatabase InternalsTrees

Data Scientist Locked

SQL: Average Ride Rating in Users' First and Third Active Months by City

Write a PostgreSQL query that compares average ride ratings in each user's first and third active months, grouped by city and averaged over individual...

Data Manipulation (SQL/Python)SQL

Load Daily JSONL LLM Chat Logs Into a Warehouse: Schema, Validation, Dedup, Idempotency

A data engineering take-home: load daily JSONL files of LLM conversation logs from object storage into a warehouse, with schema DDL, parsing, validati...

Data Manipulation (SQL/Python)ETL & Data PipelinesData Quality & Validation

Data ScientistSenior+

Measure Customers Ordering from Bottom-Quartile Restaurants

Measure Customers Ordering from Bottom-Quartile Restaurants Write one PostgreSQL SELECT statement or CTE query. Do not create, alter, or modify tables...

Data Manipulation (SQL/Python)SQLMetrics & KPIs

Find Customers with No Matching Order

Problem Return the names of customers who have never placed an order. Match Customers.id to Orders.customerId and label the result Customers. The row ...

Data Manipulation (SQL/Python)SQL

21 people solved

Stripe

Medium

Software Engineer Locked

Reconcile Monthly Bank-Account Balances Across Two Datasets

Compare bank-account balances for a target calendar month, report match status, and distinguish missing comparison records from zero balances.

Data Manipulation (SQL/Python)SQL

Data Scientist Locked

SQL: Monthly Ride Totals and Average Ratings, Newest Month First

Write a PostgreSQL query that reports, for each calendar month, the total number of rides and the average rating rounded to two decimals, newest month...

Data Manipulation (SQL/Python)SQL

92 people solved

Sep 10, 2026

Find Values Owned Only by the Selected User

Use PostgreSQL to find values belonging to one selected user and no other user, while handling repeated values and shared ownership.

Data Manipulation (SQL/Python)SQL

Design an Inventory Service: SQL Schema, Safe Stock Reservations and Analytics

Design an inventory service. The prompt is deliberately vague: you decide which functional and non-functional requirements the service must meet. The ...

System DesignSystem Design FundamentalsTransactions & Isolation

75 people solved

Sep 27, 2026

GoogleMicrosoftAmazon

Easy

Software Engineer

List Email Spellings That Occur More Than Once

Problem List every duplicate email from Person once, under the output label Email. The email field is guaranteed non-NULL and contains no uppercase le...

Data Manipulation (SQL/Python)SQLData Cleaning & Wrangling

Analyze Mission Outcomes and Allocate Response Units

Solve a multi-part data analysis case using mission outcomes and response-unit history. Compute and interpret win rates, compare rest-time groups, han...

Data Manipulation (SQL/Python)Business Case AnalysisSampling & Estimation

Data Scientist Locked

SQL: Users With No Rides in the Most Recent 7-Day Window, Including Non-Riders

Write a PostgreSQL query that lists users with no rides in the most recent 7-day window, including users who never rode. Tests anchoring a date window...

Data Manipulation (SQL/Python)SQL

Find Customers Whose Average Website Resource Usage Exceeds 50 Percent

Write one read-only PostgreSQL query that reports customers whose average website resource usage exceeds 50 percent. Schema | Table | Column | Type | ...

Data Manipulation (SQL/Python)SQL

Build a Chainable Python SQL Query Builder with Where, Alias and Join Support

Implement a small ORM-style query builder in Python. An existing test suite drives it through a fluent API and compares the string returned by render(...

Software Engineering FundamentalsLow-Level Design (OOP)Parsing & Interpreters

44 people solved

Sep 19, 2026

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Tech Interview Questions

Learn an Unfamiliar SQL-Like Query Class, Then Solve Tasks with Its Map and Fold Actions

Fix a Buggy Spring Boot Movie Search Against Five Search Rules

Calculate the Percentage of Highly Active Users by Country

Debug Failing Tests in a Django Movie Search and Filter API

SQL: Zero-Filled DAU, Rolling 30-Day MAU, and the MAU Impact of a User-ID Rehash

SQL: Count Users With Zero or One Rides per City

Implement Column Pruning and Filter Pushdown on a Query Plan Tree

SQL: Average Ride Rating in Users' First and Third Active Months by City

Load Daily JSONL LLM Chat Logs Into a Warehouse: Schema, Validation, Dedup, Idempotency

Measure Customers Ordering from Bottom-Quartile Restaurants

Find Customers with No Matching Order

Reconcile Monthly Bank-Account Balances Across Two Datasets

SQL: Monthly Ride Totals and Average Ratings, Newest Month First

Find Values Owned Only by the Selected User

Design an Inventory Service: SQL Schema, Safe Stock Reservations and Analytics

List Email Spellings That Occur More Than Once

Analyze Mission Outcomes and Allocate Response Units

SQL: Users With No Rides in the Most Recent 7-Day Window, Including Non-Riders

Find Customers Whose Average Website Resource Usage Exceeds 50 Percent

Build a Chainable Python SQL Query Builder with Where, Alias and Join Support

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