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."
Simulate Radioactive Decay to Validate Analytical Solution
Scenario Same radioactive-decay problem, but now validate the analytical answer via simulation during the interview. Question Share screen and write r...
Find Index Pairs of Matching Elements in Arrays
Scenario Marketing analytics team needs to find common elements between two sorted arrays of user IDs. Question Given two sorted integer arrays withou...
Solve Logic Puzzles: Algorithms and Proofs Required
Solve Logic Puzzles: Algorithms and Proofs Required Scenario On-site logic/algorithm quiz with hiring manager and VP Question Solve six AMC-8–level ma...
Sort and Rearrange: Efficient Algorithms for Diverse Challenges
Sort and Rearrange: Efficient Algorithms for Diverse Challenges Scenario Coding rounds and infrastructure-style algorithm questions. Question Write an...
Design Efficient Data Structure for Median Retrieval
Scenario Senior problem-solving round assessing algorithmic thinking under time pressure. Question Design a data structure that supports inserting int...
Optimize Oculus Data Streaming with Bandwidth Constraints
Scenario Algorithmic screening for Meta VR/AR teams covering Oculus data streaming and geometric optimization. Question Oculus: Given an array frame_s...
Identify Pirate-Themed Custom Themes Using Jaccard Similarity
Scenario Engineering receives two lists and must identify custom themes that look like Pirate themes. Question a) Write a Python function that compute...
Identify Bugs in Python Script for User Assignment
Scenario A simple Python script assigns users to experiment groups and triggers the free-trial offer. Question Inspect the script and list any bugs or...
Design Algorithm for Longest Substring with K Distinct Characters
Scenario Tech interview round 2 – sliding-window algorithm Question Design an algorithm that finds the length of the longest substring containing at m...
Optimize Driver Repositioning for Minimal Pickup Time
Scenario Design and implement algorithms for ride-sharing dispatch and capacity planning. Question Given historical rider demand density and current d...
Implement nth Fibonacci number
Implement nth Fibonacci number Problem Write a function that returns the n-th Fibonacci number. The Fibonacci sequence is defined as: - \(F(0)=0\) - \...
Implement two-pointer unique-pair sum search
Implement two-pointer unique-pair sum search Given a nondecreasing integer array nums and an integer target, return all unique value pairs [a, b] with...
Decompress an encoded string
Decompress an encoded string Given an encoded string, return its decoded (decompressed) form. Use the following encoding rule: - A positive integer \(...
Design Efficient Multi-Level Access Control System
Scenario Multi-level access control lists (country → city) must be queried quickly. Question Design and implement a permission system where each geogr...
Implement Data Structure for Top-K Elements in Streams
Scenario Analytics feature that must constantly report the K largest numbers seen so far. Question Implement a data structure that ingests a stream of...
Maximize Distinct Purchases Within Budget Constraints
Scenario Given a customer budget and a list of product prices, determine the maximum number of distinct products the customer can afford. Question Des...
Implement Infinite Fibonacci Generator Using Lazy Evaluation
Scenario Testing understanding of Python lazy evaluation and generators. Question Explain what lazy evaluation means in Python and implement a generat...
Determine If Two Strings Are Anagrams Efficiently
Scenario Backend service needs to verify whether two user-provided strings are anagrams for text-matching features. Question Implement a Python functi...
Median, Variance, and Linear Trend of a Daily Temperature Dataset
Median, Variance, and Linear Trend of a Daily Temperature Dataset You are given n daily temperature readings collected in New York City. The data is a...
Fill Missing Time-Series Values with Linear Interpolation (Duplicate Timestamps Allowed)
Fill Missing Time-Series Values with Linear Interpolation (Duplicate Timestamps Allowed) You are given readings from a single sensor as a list of reco...