Data Engineer Interview Questions
Practice 132 real interview questions for Data Engineer roles. From companies including Meta, TikTok, Rbcroyalbank, Amazon, Capital One. Covers Coding & Algorithms, Data Manipulation (SQL/Python), Behavioral & Leadership, System Design.
"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."
Build a Transaction CSV Cleaning Pipeline
You receive a raw CSV file containing customer transaction data with the columns date, amount, customer_id, payment_method, and notes. Known data-qual...
Describe Resolving Stakeholder Trade-Offs
Tell me about a time when you worked with multiple stakeholders who had different needs or priorities, and you had to create a solution that satisfied...
Write SQL Data Transformation Queries
Use SQL to solve the following data transformation tasks. Assume standard SQL features are available, including window functions and recursive common ...
Explain Spark Execution and Optimization
You are interviewing for a Data Engineer role. Answer the following Apache Spark and PySpark fundamentals questions in a practical production-data con...
Design an event analytics platform
Design a data platform for raw product events with this schema: - event_id - event_type - user_id - user_setting as a nested object - event_metadata a...
Implement Portfolio Trading Optimizer
You are given an array prices, where prices[i] is the price of one stock on day i. You may perform multiple buy/sell transactions over the period, but...
Design Data Quality and Observability Pipeline
Design a production data orchestration, data quality, and observability framework for batch and streaming data pipelines. Your design should address: ...
Discuss Challenges and Career Goals
Answer the following behavioral interview questions: 1. What was the most difficult problem you have faced in your work, and how did you approach it? ...
Implement Election Report and Banking Pipeline
You are given two independent data engineering coding tasks. Task 1: SQL Election Exit Poll by State Report An election analytics team needs a report ...
Answer Amazon Behavioral Questions
You are interviewing for an Amazon Software Development Engineer internship final round. Prepare strong, structured responses to the following behavio...
Explain impact and partnership
Prepare for a hiring manager interview and a cross-functional partner conversation. Be ready to answer questions such as: - Why do you want to join th...
Evaluate credit-limit increase profitability
Business/Analytics Case: Credit Limit Increase Strategy You are a data scientist supporting a consumer credit business. Scenario The company is consid...
Write SQL using joins and window functions
SQL Coding: Rank within Groups with Joins You are given two tables: accounts - account_id (string) - customer_id (string) - segment (string) — e.g., "...
Describe past NLP work and collaboration
Scenario In an initial phone screen, the interviewer asks you to introduce yourself, then drills into your resume. Questions (answer using concrete ex...
Compute User Login Streaks
Given a table user_login_log with the following columns: - user_id: the user identifier - login_date: the calendar date of a login event A user may ha...
Answer conflict and ambiguity with STAR stories
Job Fit / Behavioral: STAR Stories Prepare answers using the STAR (Situation, Task, Action, Result) format for the following prompts: 1. Tell me about...
Write SQL for first share and closest collaborator
You are given event data about users viewing design files. Assume the following tables: - files(file_id, creator_id) - creator_id is a VARCHAR user ...
Compute Minimum Days with Cooling Period
You are given an ordered list of products to manufacture and a non-negative integer space representing the cooling period. Each day, you may either: -...
Explain Pandas and SQL Basics
You are interviewing for a Data Engineer internship. Answer the following short data-manipulation questions: 1. In pandas, what is the difference betw...
Implement a DAG task graph
Implement a class TaskGraph to represent a directed acyclic graph of tasks. Support these operations: 1. add_task(task_id: str) -> None: Add a task if...