Software Engineer Data Manipulation (SQL/Python) Interview Questions
Practice 55 real Data Manipulation (SQL/Python) interview questions for Software Engineer roles. From companies including Amazon, NVIDIA, DoorDash, Akuna Capital, Stripe.
"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."
Analyze Returning Borrowers Across Two Days of Logs
Analyze Returning Borrowers Across Two Days of Logs You receive two collections of loan-activity records, one for each of two consecutive days. Each r...
Compute delivery metrics and top-K queries
Compute delivery metrics and top-K queries You have restaurant menus and orders for a food delivery platform. Part 1: Given a user location and a set ...
Implement paginated API ingestion
You are given a REST endpoint GET /orders?page=1&limit=100 that returns JSON objects of the form { "page": n, "per_page": m, "total_pages": T, "data":...
Parse and build binary data in Python
Using provided interfaces ByteReader(read(n), read_uint32_le, read_string) and ByteWriter(write(b), write_uint32_le, write_string), implement function...
Explain Python lists, dicts, and concurrency
Explain Python lists, dicts, and concurrency Explain the differences between Python lists and dictionaries (maps), including common operations and the...
Implement a nested object validator
Implement a helper function validate(object, required_style) that checks whether a possibly nested object matches a provided schema. The object may co...
Parse a deeply nested JSON
Parse a deeply nested JSON Given a JSON document with approximately five levels of nesting, write code to traverse it and extract specified fields whi...
Identify false MySQL foreign key statement
MySQL: Which of the following statements is false? A) A column might have a foreign key reference to itself. B) MySQL supports foreign key references ...
Fill missing values with means
You are given a pandas DataFrame df with missing values in multiple numeric columns. Write a concise pandas expression to replace NaNs in each numeric...
Analyze and debug Python utilities
Analyze and debug Python utilities You are given a snippet where a Python helper class repeatedly reads from an HTTP response stream and writes output...
Review a geospatial Python module
You receive a Python module that processes geospatial datasets (CSV/GeoJSON) to compute distances, cluster nearby points, and write summaries. Perform...
Implement a Python test harness
Implement a Python test harness Implement a Python-based test harness for graphics validation. Discuss design of fixtures, parametrization, dependency...
Implement filters and cursor pagination
Design and implement a transaction query module over a dataset or database where each transaction has startDate, endDate, userId, and amount. Requirem...
Print the K-th non-empty line
Given a large UTF-8 text file, write a program that prints the K-th non-empty line. Do not load the whole file into memory. Specify how you handle fil...
Fetch and parse JSON from REST API
Question Set up a minimal coding environment from scratch and write runnable code that fetches and processes data from a REST API. You are given an en...
Discuss Python mutability, copying, and GIL
In Python, explain the differences between mutable and immutable objects and illustrate how they affect function arguments and container behavior. Des...
Set up a Python interview environment
You can use AI coding tools. Prepare a clean laptop for a Python-based onsite and explain your steps: ( 1) Install pyenv and set up a project-specific...
Generate user notifications from schedules
Given a schedule template format and user profile data (timezone, locale, delivery preferences), implement a program that generates a user notificatio...
Count words in a document robustly
Given a text document, return the number of words under a precise definition. First, state the tokenization rules you will use (e.g., treat contractio...
Write SQL with window functions for analytics
Given a table events(user_id, event_time, event_type, value), write SQL to: a) compute each user's rolling 7-day sum of value by day, b) rank each use...