Data Scientist Coding & Algorithms Interview Questions
Practice 335 real Coding & Algorithms interview questions for Data Scientist roles. From companies including Amazon, Google, Two Sigma, Pinterest, Uber.
"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"
"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"
"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."
"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."
"Got a Google recruiter call on Monday, interview on Friday. Crammed PracHub for 4 days. Passed every round. This platform is a miracle worker."
"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."
"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."
"Legit the only resource you need. TC went from 180k -> 350k. Just memorize the top 50 for your target company and you're golden."
"PracHub Premium for one month cost me the price of two coffees a week. It landed me a $280K+ starting offer."
"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."
"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."
"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."
"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."
"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."
"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."
Identify Longest Consecutive Incrementing Watch-Time Sequence
Scenario A streaming platform records daily minutes watched per user and wants to identify engagement streaks. Question Given an unsorted integer arra...
Maximize Stock Trading Profits Using Dynamic Programming
Scenario Evaluating dynamic-programming skills on stock-trading profits. Question Given an array of daily stock prices and an integer K, write Python ...
Solve Data Structure Challenges with Python Algorithms
Scenario You are given coding challenges in Python to manipulate simple data structures. Question Remove duplicates from a list of integers while pres...
Remove Duplicates While Preserving Order in List
Scenario A data pipeline receives an unordered list of IDs containing duplicates; downstream components require a duplicate-free list while preserving...
Implement Function to Determine Mode and Prime Numbers
Scenario Implementing utility algorithms within a data-processing library. Question Write a function that returns the mode of an integer list; if all ...
Explain Python Virtual Environment Setup and Function Analysis
Scenario Technical screen where candidate and interviewer jointly walk through Python code snippets used in a data-science repository. Question Show h...
Compute Averages of Unique Numbers in Dictionary Lists
Scenario Python tech screen: given a dictionary mapping keys to numeric lists, e.g., {'a':[1,2,1],'b':[1,2,3]}, compute the average of each list after...
Solve Aptitude Test: Logical, Numerical, Verbal Reasoning
Scenario Pre-employment aptitude screen assessing logical, numerical and verbal reasoning within a strict time limit Question You have 15 minutes to s...
Implement Real-Time Rate Limiting for Web Service Requests
Scenario A web service must throttle traffic from clients; you need to decide in real-time whether each incoming request should be served or rejected ...
Optimize Job Routing in Parallel Machine Scheduling
Scenario In the Production Factory game, jobs with varying processing times arrive and must be routed through two parallel machines to minimize total ...
Calculate 7-Day Rolling Average for Energy Consumption
Scenario Hiring manager wants a quick coding exercise to verify programming fluency. Question Write a Python function that takes a list of daily energ...
Implement Python Function for Statistical Test P-Values
Scenario You need a utility that calculates p-values for one-sided and two-sided statistical tests. Question Write a Python function compute_p_value(s...
Find Longest Increasing Continuous Subarray
Solve the longest increasing contiguous subarray problem in one pass. Includes Python code, edge cases, complexity, and a follow-up for returning the ...
Make Two Apple Piles Equal With Doubling Moves
You have two piles of apples: the first pile contains a apples and the second pile contains b apples. In one move you choose one pile to be the receiv...
Streaming Equivalence of Two Trade Feeds with Per-Company Ordering
A market-data system receives trade events from two independent feeds. Each event is a pair (company, trade_id) identifying one trade for one company....