Data Engineer Interview Questions
If you’ve just begun your Data Engineering interview preparation, it is important to know the type of Data Engineering interview questions to expect. The better your ability to tackle tough Data Engineer interview questions, the better your chances of landing dream Data Engineer jobs at FAANG+ companies.
Data Engineer interview questions are typically around coding, Big Data, and Data Engineering-related concepts, SQL queries, and behavioral aspects.
Before we look at some sample Data Engineer interview questions, let’s first take a quick glance at the important concepts to prepare from an interview perspective.
Below are the concepts you should definitely cover for your Data Engineering interview.
- Algorithms and Data Structures
- Product Sense, Metric Design
- Spark, Kafka
- Automation tools like Airflow
- Data Pipeline Design
- DB Performance Tuning
- Data Modeling
Data Engineering Interview Questions on Coding
Given an integer array arr of size n, find all magic triplets in it. A magic triplet is a group of three numbers whose sum is zero.
Given an array of integers, find any non-empty subarray whose elements sum up to zero.
Given an unsorted set of numbers from 1 to N with exactly two of them missing, find those two missing numbers.
For an array of integers and unique values, write a program code to decipher if the sum of any two integers in the array is equal to a given value.
Data Engineering Interview Questions on SQL Queries
You’re given a dataset with information on users who’ve purchased a list of products. Design a dashboard to highlight specific aspects of user behavior.
You’re given a dataset with the number of users visiting an e-commerce site and purchasing a long list of products. Find the top-performing product in the last one hour.
Create DDL (table and foreign keys) for several tables in a provided ERD.
Create a real-time dashboard to return the number of views for a popular video posted online. Also, find how many users didn’t watch the entire length of the video.
You’re given a raw table with information. Use ETL design to create a clear table with neatly distributed information using SQL.
Generic Data Engineering Interview Questions
How would you handle duplicate data points in an SQL query?
For an expected increase in data volume, what steps would you take to add more capacity to the data processing architecture?
For a given array of integers of length n spanning 0 to n with one missing, you have to write a function missing_number that returns the missing number in the array.
For a given list of integers, write a program to find the index where the sum of the left half of the list equals the right half. Return -1 if there is no index satisfying the condition.
When would you use the NumPy library vs. pandas?
Don’t forget to check company-specific Data Engineering interview questions: