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About the test:

The Data Engineer Online Test uses scenario-based multiple-choice questions to evaluate candidates on their expertise in data engineering, which involves designing, building, and maintaining data architectures, databases, and processing systems. The test gauges candidates' proficiency in data modeling and warehousing, ETL (Extract, Transform, Load) processes, data pipeline construction, distributed computing systems, database systems, data security principles, and performance optimization strategies for data systems.


9 reasons why
9 reasons why

Adaface Data Engineer Test is the most accurate way to shortlist Data Engineers



Reason #1

Tests for on-the-job skills

The Data Engineer Test helps recruiters and hiring managers identify qualified candidates from a pool of resumes, and helps in taking objective hiring decisions. It reduces the administrative overhead of interviewing too many candidates and saves time by filtering out unqualified candidates at the first step of the hiring process.

Non-googleable questions & proctoring features enable you to be comfortable with conducting assessments online. The Data Engineer Test is ideal for helping recruiters identify which candidates have the skills to do well on the job.

Reason #2

No trick questions

no trick questions

Traditional assessment tools use trick questions and puzzles for the screening, which creates a lot of frustration among candidates about having to go through irrelevant screening assessments.

The main reason we started Adaface is that traditional pre-employment assessment platforms are not a fair way for companies to evaluate candidates. At Adaface, our mission is to help companies find great candidates by assessing on-the-job skills required for a role.

Why we started Adaface ->
Reason #3

Non-googleable questions

We have a very high focus on the quality of questions that test for on-the-job skills. Every question is non-googleable and we have a very high bar for the level of subject matter experts we onboard to create these questions. We have crawlers to check if any of the questions are leaked online. If/ when a question gets leaked, we get an alert. We change the question for you & let you know.

These are just a small sample from our library of 10,000+ questions. The actual questions on this Data Engineer Test will be non-googleable.

🧐 Question

Easy

Count number of occurrences
Mappers
Reducers
Solve
Chusk works as Hadoop developer at Pesla Inc. Chusk is tasked with processing input data to count number of occurrences of each unique word. Chusk did the following to achieve this:

1. Tokenize each word and emit lateral value 1 with Mapper
2. Reducer increments counter for each literal 1 it receives
Chusk is now tasked with optimizing this by using a combiner. Will Chusk be able to reuse existing reducers as combiners?
A: Yes
B: No
C: Because the sum operation is both associative and commutative and the input and output types to the reduce method match
D: Because the sum operation in the Reducer is incompatible with the operation of a combiner
E: Because the combiner is incompatible with a Mapper, which doesn't use the same data type for both the key and value
F: Insufficient information

Medium

Hive ngrams
Solve
Assuming the following Hive statements execute successfully, choose the correct statements that describe the result:

from fooddata select context_ngrams(sentences(lines),
array("twiggy", "romato", null), 68);

A. A bigram of the top 68 sentences that contain the substring "twiggy romato" in the lines column of the input data A1 table.
B. An 68-value ngram of sentences that contain the words "twiggy" or "romato" in the lines column of the fooddata table.
C. A trigram of the top 68 sentences that contain "twiggy romato" followed by a null space in the lines column of the fooddata table.
D. A frequency distribution of the top 68 words that follow the subsequence "twiggy romato" in the lines column of the fooddata table.

Easy

P Q relations
Pig
Solve
Consider the following two relations, P and Q:
 image
What is the output of the following Pig command?

Q = GROUP P BY p2;
DUMP Q;
 image

Easy

Character count
Solve
Penny created a jar file for her character count example written in Java. The jar name is attempt.jar and the main class is com.penny.CharCount.java, which requires an input file name and output directory as input parameters. Which of the following is the correct command to submit a job in Spark with the given constraints?
 image

Medium

File system director
Spark Scala API
Spark Streaming
Solve
Review the following Spark job description:

1. Monitor file system director for new files. 
2. For new files created in the “/rambo” dictionary, perform word count.

Which of the following snippets would achieve this?
 image

Medium

Grade-Division-Points
Spark Scala API
DataFrame
Solve
Consider the following Spark DataFrame:
 image
Which of the given code fragments produce the following result:
 image
 image

Medium

Analyzing Hive Join
Optimization
Solve
Consider the following two Hive tables in a space adventure context:
 image
Assume that the astronauts table is small and can fit in memory. Which of the following queries will take full advantage of a map-side join?
 image

Medium

Hive Archive
Solve
You have a partitioned Hive table sales_data with the following schema:
 image
You want to archive the oldest partition (date='2023-01-01', region='North America') and store it in the Hadoop Distributed File System (HDFS) at /archive/sales_data. Which of the following steps is the correct approach to perform the archiving operation?
A: Enable archiving on the table, and then issue an ALTER TABLE statement to move the partition to the archive directory.

B: Issue an ALTER TABLE statement to move the partition to the archive directory, and then lock the partition to prevent further modifications.

C: Enable archiving on the table, and then use the EXPORT command to export the partition to the archive directory.

D: Use the EXPORT command to export the partition to the archive directory, and then lock the partition to prevent further modifications.

E: Use the EXPORT command to export the partition to the archive directory, and then drop the partition from the sales_data table.

Hard

Jobs file
Solve
Assuming the following Hive statements execute successfully, choose the correct statements that describe the result:
 image
A. Hive reformats JobsFile2 into a structure that Hive can access and moves into to /user/steve/fenty/
B. The file named JobsFile2 is moved to to/user/steve/fenty/
C. The contents of JobsFile2 are parsed as comma-delimited rows and loaded into /user/steve/fenty/
D. The contents of JobsFile2 are parsed as comma-delimited rows and stored in a database

Medium

onCompletion method call
Solve
Do you know when the onCompletion() method is called?
 image

Easy

Topics and partitions
KStream
Partition
Solve
Our ecommerce website, Dove Bonito maintains two topics: 1 high volume topic, "purchase" with 5 partitions and 1 low volume topic "customer" with 3 partitions. The team wants to do a stream-table join of these topics. What would you recommend?

Medium

word-count-output
Solve
 image
What is an adequate topic configuration for the topic word-count-output?

Medium

Applying Functions
Data frames
Functions
Math
Solve
Consider the following R code:
 image
This script defines a function apply_fun that calculates the mean of a vector and adds it to the standard deviation of the vector. The apply function is then used to apply this function to each column of the data frame df. What will be the value of result after the script is run?

Medium

Dataframe Transform
Solve
Review the following Dataframe 'bazinga':
 image
Which of the following commands would turn it into the Dataframe shown below:
 image
 image

Medium

Matrix Manipulation
Matrices
Lists
Solve
Consider the following pseudo code:
 image
What will be the state of list_of_matrices after running the script?
 image

Medium

Multi Select
JOIN
GROUP BY
Solve
Consider the following SQL table:
 image
How many rows does the following SQL query return?
 image

Medium

nth highest sales
Nested queries
User Defined Functions
Solve
Consider the following SQL table:
 image
Which of the following SQL commands will find the ‘nth highest Sales’ if it exists (returns null otherwise)?
 image

Medium

Select & IN
Nested queries
Solve
Consider the following SQL table:
 image
Which of the following SQL queries would return the year when neither a football or cricket winner was chosen?
 image

Medium

Sorting Ubers
Nested queries
Join
Comparison operators
Solve
Consider the following SQL table:
 image
What will be the first two tuples resulting from the following SQL command?
 image

Hard

With, AVG & SUM
MAX() MIN()
Aggregate functions
Solve
Consider the following SQL table:
 image
How many tuples does the following query return?
 image

Hard

ER Diagram and minimum tables
ER Diagram
Solve
Look at the given ER diagram. What do you think is the least number of tables we would need to represent M, N, P, R1 and R2?
 image
 image
 image
🧐 Question🔧 Skill

Easy

Count number of occurrences
Mappers
Reducers
3 mins
Hadoop
Solve

Medium

Hive ngrams
2 mins
Hadoop
Solve

Easy

P Q relations
Pig
2 mins
Hadoop
Solve

Easy

Character count
2 mins
Spark
Solve

Medium

File system director
Spark Scala API
Spark Streaming
3 mins
Spark
Solve

Medium

Grade-Division-Points
Spark Scala API
DataFrame
4 mins
Spark
Solve

Medium

Analyzing Hive Join
Optimization
3 mins
Hive
Solve

Medium

Hive Archive
3 mins
Hive
Solve

Hard

Jobs file
2 mins
Hive
Solve

Medium

onCompletion method call
2 mins
Kafka
Solve

Easy

Topics and partitions
KStream
Partition
2 mins
Kafka
Solve

Medium

word-count-output
2 mins
Kafka
Solve

Medium

Applying Functions
Data frames
Functions
Math
3 mins
R
Solve

Medium

Dataframe Transform
3 mins
R
Solve

Medium

Matrix Manipulation
Matrices
Lists
3 mins
R
Solve

Medium

Multi Select
JOIN
GROUP BY
2 mins
SQL
Solve

Medium

nth highest sales
Nested queries
User Defined Functions
3 mins
SQL
Solve

Medium

Select & IN
Nested queries
3 mins
SQL
Solve

Medium

Sorting Ubers
Nested queries
Join
Comparison operators
3 mins
SQL
Solve

Hard

With, AVG & SUM
MAX() MIN()
Aggregate functions
2 mins
SQL
Solve

Hard

ER Diagram and minimum tables
ER Diagram
2 mins
Data Modeling
Solve
🧐 Question🔧 Skill💪 Difficulty⌛ Time
Count number of occurrences
Mappers
Reducers
Hadoop
Easy3 mins
Solve
Hive ngrams
Hadoop
Medium2 mins
Solve
P Q relations
Pig
Hadoop
Easy2 mins
Solve
Character count
Spark
Easy2 mins
Solve
File system director
Spark Scala API
Spark Streaming
Spark
Medium3 mins
Solve
Grade-Division-Points
Spark Scala API
DataFrame
Spark
Medium4 mins
Solve
Analyzing Hive Join
Optimization
Hive
Medium3 mins
Solve
Hive Archive
Hive
Medium3 mins
Solve
Jobs file
Hive
Hard2 mins
Solve
onCompletion method call
Kafka
Medium2 mins
Solve
Topics and partitions
KStream
Partition
Kafka
Easy2 mins
Solve
word-count-output
Kafka
Medium2 mins
Solve
Applying Functions
Data frames
Functions
Math
R
Medium3 mins
Solve
Dataframe Transform
R
Medium3 mins
Solve
Matrix Manipulation
Matrices
Lists
R
Medium3 mins
Solve
Multi Select
JOIN
GROUP BY
SQL
Medium2 mins
Solve
nth highest sales
Nested queries
User Defined Functions
SQL
Medium3 mins
Solve
Select & IN
Nested queries
SQL
Medium3 mins
Solve
Sorting Ubers
Nested queries
Join
Comparison operators
SQL
Medium3 mins
Solve
With, AVG & SUM
MAX() MIN()
Aggregate functions
SQL
Hard2 mins
Solve
ER Diagram and minimum tables
ER Diagram
Data Modeling
Hard2 mins
Solve
Reason #4

1200+ customers in 75 countries

customers in 75 countries
Brandon

With Adaface, we were able to optimise our initial screening process by upwards of 75%, freeing up precious time for both hiring managers and our talent acquisition team alike!


Brandon Lee, Head of People, Love, Bonito

Reason #5

Designed for elimination, not selection

The most important thing while implementing the pre-employment Data Engineer Test in your hiring process is that it is an elimination tool, not a selection tool. In other words: you want to use the test to eliminate the candidates who do poorly on the test, not to select the candidates who come out at the top. While they are super valuable, pre-employment tests do not paint the entire picture of a candidate’s abilities, knowledge, and motivations. Multiple easy questions are more predictive of a candidate's ability than fewer hard questions. Harder questions are often "trick" based questions, which do not provide any meaningful signal about the candidate's skillset.

Reason #6

1 click candidate invites

Email invites: You can send candidates an email invite to the Data Engineer Test from your dashboard by entering their email address.

Public link: You can create a public link for each test that you can share with candidates.

API or integrations: You can invite candidates directly from your ATS by using our pre-built integrations with popular ATS systems or building a custom integration with your in-house ATS.

invite candidates
Reason #7

Detailed scorecards & benchmarks

Reason #8

High completion rate

Adaface tests are conversational, low-stress, and take just 25-40 mins to complete.

This is why Adaface has the highest test-completion rate (86%), which is more than 2x better than traditional assessments.

test completion rate
Reason #9

Advanced Proctoring


Singapore government logo

The hiring managers felt that through the technical questions that they asked during the panel interviews, they were able to tell which candidates had better scores, and differentiated with those who did not score as well. They are highly satisfied with the quality of candidates shortlisted with the Adaface screening.


85%
reduction in screening time

FAQs

Can I combine multiple skills into one custom assessment?

Yes, absolutely. Custom assessments are set up based on your job description, and will include questions on all must-have skills you specify.

Do you have any anti-cheating or proctoring features in place?

We have the following anti-cheating features in place:

  • Non-googleable questions
  • IP proctoring
  • Web proctoring
  • Webcam proctoring
  • Plagiarism detection
  • Secure browser

Read more about the proctoring features.

How do I interpret test scores?

The primary thing to keep in mind is that an assessment is an elimination tool, not a selection tool. A skills assessment is optimized to help you eliminate candidates who are not technically qualified for the role, it is not optimized to help you find the best candidate for the role. So the ideal way to use an assessment is to decide a threshold score (typically 55%, we help you benchmark) and invite all candidates who score above the threshold for the next rounds of interview.

What experience level can I use this test for?

Each Adaface assessment is customized to your job description/ ideal candidate persona (our subject matter experts will pick the right questions for your assessment from our library of 10000+ questions). This assessment can be customized for any experience level.

Does every candidate get the same questions?

Yes, it makes it much easier for you to compare candidates. Options for MCQ questions and the order of questions are randomized. We have anti-cheating/ proctoring features in place. In our enterprise plan, we also have the option to create multiple versions of the same assessment with questions of similar difficulty levels.

I'm a candidate. Can I try a practice test?

No. Unfortunately, we do not support practice tests at the moment. However, you can use our sample questions for practice.

What is the cost of using this test?

You can check out our pricing plans.

Can I get a free trial?

Yes, you can sign up for free and preview this test.

I just moved to a paid plan. How can I request a custom assessment?

Here is a quick guide on how to request a custom assessment on Adaface.

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