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Data Engineer Interview Questions

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Data Engineer Interview Questions

Data engineers are IT professionals who are needed in almost every industry. Data engineers monitor data trends to determine best next steps for companies. A critical part of a data engineer job is to process raw data into usable data by creating data pipelines and building data systems.

Top Data Engineer Interview Questions & How To Answer

Question 1

Question #1: Can you describe in detail your level of expertise with programming languages?

How to answer
How to answer: Before the interview, review your resume and/or portfolio and make a list of the programs you are most proficient with. If you find that you are lacking the expertise in a program that the company predominately uses, describe yourself as a highly motivated self-starter who will work tirelessly to learn the program(s).
Question 2

Question #2: Explain data engineering in your own words.

How to answer
How to answer: Highlight your role in relation to the larger organization and other roles like data scientists to clearly define your contribution to the overall system of business. Clarify the difference between a database-centric engineer and a pipeline-centric engineer.
Question 3

Question #3: Can you describe your experience working with Apache Hadoop and cloud data management environments?

How to answer
How to answer: Research the company's software, data cloud products, and use of Apache Hadoop to be prepared for this inquiry. Data Engineers must be fluent in programming languages and data management systems used throughout the industry such as Apache Hadoop.

20,235 data engineer interview questions shared by candidates

1. 2nd Maximum Employee Salary -> SQL Tuples? -> Python // and % -> python Two Tables form 3rd using __ (INNER JOIN) (SQL) You have 8 balls, all of equal weight except one. You're given a scale, identify that anomaly ball in 2 or less tiers. 2. 75, 15, 25, 5, 15, ... (Next two numbers) Probability of 3 heads of 5 coins flipped in a go Name of employee with 4th lowest salary (SQL) List of employees with minimum 4th - 11th salaries (SQL) Pseudocode of Factorial of a number with a condition to place error for chars other than positive (or 0) input There's a wrongly wired (it's known) vending machine with Coffee, Tea and Random button (Random gives you either Coffee or Tea). If one button costs 50p, identify the correct buttons while using minimum money.
avatar

Data Automation Engineer

Interviewed at Afiniti

3.5★
Apr 15, 2022

1. 2nd Maximum Employee Salary -> SQL Tuples? -> Python // and % -> python Two Tables form 3rd using __ (INNER JOIN) (SQL) You have 8 balls, all of equal weight except one. You're given a scale, identify that anomaly ball in 2 or less tiers. 2. 75, 15, 25, 5, 15, ... (Next two numbers) Probability of 3 heads of 5 coins flipped in a go Name of employee with 4th lowest salary (SQL) List of employees with minimum 4th - 11th salaries (SQL) Pseudocode of Factorial of a number with a condition to place error for chars other than positive (or 0) input There's a wrongly wired (it's known) vending machine with Coffee, Tea and Random button (Random gives you either Coffee or Tea). If one button costs 50p, identify the correct buttons while using minimum money.

1. Explain about your projects 2. What and how will optimise spark jobs in your work(Spark related questions) 3. How will justify reliability and durability of data 4. What is Lineage graph and check points in Spark 5. Explain Strategic of Spark Coding 1. Input is an array of integers. There is a sliding window of size W which is moving from the very left of the array to the very right. Each time the sliding window moves rightwards by one position. Find the maximum number from each window. Input array is [1, 3, -1, -3, 5, 3, 6, 7] and Sliding window (W) is 3. Output array is [3, 3, 5, 5, 6, 7] 2. Write a query to provide number of times an employee got increment and max increment he has got along with columns emp_id, emp_name, joining_date, dept_name Additional info: a. An emp may not be tagged to any dept b. An emp may not have got any hike Emp table emp_id | emp_name | joining_date | Dept_id Dept table dept_id | dept_name | Dept_Location | Dept_Manager salary_increase table emp_id | increment_date | inc_amount 3. Write a Python program to find element in a list from current element to next index list is ["Mon","Tue","Wed","Thu","Fri","Sat","Sun"] If current element is “Wed” and next index is 2, result is “Fri” If current element is “Sat” and next index is 23 (cyclic), result is “Mon”
avatar

Senior Data Engineer

Interviewed at NIKE

3.9★
Sep 16, 2021

1. Explain about your projects 2. What and how will optimise spark jobs in your work(Spark related questions) 3. How will justify reliability and durability of data 4. What is Lineage graph and check points in Spark 5. Explain Strategic of Spark Coding 1. Input is an array of integers. There is a sliding window of size W which is moving from the very left of the array to the very right. Each time the sliding window moves rightwards by one position. Find the maximum number from each window. Input array is [1, 3, -1, -3, 5, 3, 6, 7] and Sliding window (W) is 3. Output array is [3, 3, 5, 5, 6, 7] 2. Write a query to provide number of times an employee got increment and max increment he has got along with columns emp_id, emp_name, joining_date, dept_name Additional info: a. An emp may not be tagged to any dept b. An emp may not have got any hike Emp table emp_id | emp_name | joining_date | Dept_id Dept table dept_id | dept_name | Dept_Location | Dept_Manager salary_increase table emp_id | increment_date | inc_amount 3. Write a Python program to find element in a list from current element to next index list is ["Mon","Tue","Wed","Thu","Fri","Sat","Sun"] If current element is “Wed” and next index is 2, result is “Fri” If current element is “Sat” and next index is 23 (cyclic), result is “Mon”

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