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 Coin Flips to Determine Fairness via Empirical Distribution
Scenario You must test whether a coin is fair by simulation. Question Write code that repeatedly simulates n coin flips, records the number of heads, ...
Design Algorithm for Longest Increasing Subsequence Length
Scenario Programming assessment and infrastructure panel Question Design an algorithm to return the length of the Longest Increasing Subsequence of an...
Determine If Two Numbers Sum to Target
Scenario Live CodeShare Python/Java question during the same LendingClub interview assessing basic algorithmic fluency. Question Given an integer arra...
Find Smallest Missing Positive Integer in O(n) Time
Scenario LeetCode-style algorithm phone interview Question Implement a function that returns the smallest missing positive integer in an unsorted inte...
Implement Python Function for Longest Unique Substring Length
Scenario Real-time text analytics service enforcing uniqueness constraints Question Implement a Python function returning the length of the longest su...
Determine Length of Longest Unique Substring
Scenario Online assessment: coding portion that follows the SQL questions. Question Implement a function that, given a string s, returns the length of...
Identify Number Pairs Adding to Target in Array
Scenario Coding round to identify all number pairs that add up to a target in an array containing duplicates. Question Given an integer array (may con...
Solve Algorithmic Challenges in Online Coding Assessments
Scenario Online assessment requiring implementation of common algorithmic problems. Question Given an array of integers and a target, return indices o...
Generate Bigrams Using Python List Comprehension and Zip
Scenario Live Python exercise: generate all bigrams from an input string and iteratively optimize the solution. Question Write a Python function that ...
Critique and Test Python Preprocessing Utilities Effectively
Scenario Code review of Python preprocessing utilities (OutlierHandler and three Imputer classes) Question Summarize, at a high level, what the Outlie...
Explain Shell Script Line-by-Line for Data Science Workflows
Scenario Technical screening for a Principal Data Scientist: reviewing shell script and Python classes Question Explain, line by line, what the provid...
Identify Pirate Themes Using Similarity Score Algorithm
Scenario Engineering wants an automated way to spot custom themes that are probably just pirate themes in disguise. Question Write Python that takes t...
Generate Synthetic Clickstream Data with Python Function
Scenario The analytics team needs to generate synthetic click-stream records to test a new reporting pipeline before real traffic arrives. Question Wr...
Solve Search Insert Position Using Binary Search
Scenario Live coding round for an Amazon Applied Scientist position; candidate must solve LeetCode 35 (Search Insert Position) without helper librarie...
Implement Reservoir Sampling; Analyze Time and Space Complexity
Scenario Process an unbounded stream of user IDs and maintain a uniform random sample of k users in memory. Question Implement reservoir sampling for ...
Find Minimum Path Sum in Integer Triangle
Scenario Tech interview round 1 – dynamic programming challenge Question Given a triangle of integers, find the minimum path sum from top to bottom. A...
Determine Maximum Path Length in Directed Acyclic Graph
Scenario A backend service represents task dependencies as a directed graph; you need to understand how deep the longest dependency chain can get. Que...
Calculate 95% Bootstrap Confidence Interval for Order Values
Scenario An e-commerce firm wants a 95% confidence interval for the average order value but only has a single historical sample of order amounts. Ques...
Implement BFS to Find Shortest Path in Graph
Scenario Social network needs to compute the shortest friend-distance between two users in an undirected graph containing millions of nodes. Question ...
Implement and Analyze 'Merge k Sorted Lists' Algorithm
Scenario Algorithm coding challenge during the final interview round. Question Implement LeetCode 23 ‘Merge k Sorted Lists’ and explain your complexit...