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About the test:

The ETL assessment test evaluates a candidate's ability to identify tools used for extracting the data, merge extracted data logically or physically, define transformations to apply to source data to make the data contextual and outline methods for loading data into the destination system.

Covered skills:

  • Automate ETL jobs
  • Data Warehouse Architecture
  • Data Pipelines
  • Data Warehouse Layers
See all covered skills

9 reasons why
9 reasons why

Adaface ETL Assessment Test is the most accurate way to shortlist ETL Developers

Reason #1

Tests for on-the-job skills

The (Extract, Transform, and Load) ETL Online 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.

The Adaface ETL online test screens candidates for the typical skills recruiters look for ETL developer roles:

  • Identifying methods and tools used for extracting the data, merging the data logically or physically, and importing data into data repositories.
  • Defining transformations to apply to source data to make the data credible, contextual, and accessible to data users.
  • Outlining methods for loading data into the destination system, verifying data quality, and monitoring load failures.
  • Use of recovery mechanisms in case of failure.
  • Automating ETL jobs and data pipelines using tools like BASH scripts.
  • Designing Data Warehouses using star and snowflake schemas.
  • Loading and verifying data in staging areas.
  • Building cubes, rollups and materialized views/tables.
  • Analyzing data in warehouses using interactive reports and dashboards using BI tools.

The ETL developer 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 ETL Assessment Test will be non-googleable.

🧐 Question


Data Updates
Data Warehouse
Jaylo is hired as Data warehouse engineer at Affflex Inc. Jaylo is tasked with designing an ETL process for loading data from SQL server database into a large fact table. Here are the specifications of the system:
1. Orders data from SQL to be stored in fact table in the warehouse each day with prior day’s order data
2. Loading new data must take as less time as possible
3. Remove data that is more then 2 years old
4. Ensure the data loads correctly
5. Minimize record locking and impact on transaction log
Which of the following should be part of Jaylo’s ETL design?

A: Partition the destination fact table by date
B: Partition the destination fact table by customer
C: Insert new data directly into fact table
D: Delete old data directly from fact table
E: Use partition switching and staging table to load new data
F: Use partition switching and staging table to remove old data


Trade Index
Silverman Sachs is a trading firm and deals with daily trade data for various stocks. They have the following fact table in their data warehouse:
Table: Trades
Indexes: None
Columns: TradeID, TradeDate, Open, Close, High, Low, Volume
Here are three common queries that are run on the data:
Dhavid Polomon is hired as an ETL Developer and is tasked with implementing an indexing strategy for the Trades fact table. Here are the specifications of the indexing strategy:

- All three common queries must use a columnstore index
- Minimize number of indexes
- Minimize size of indexes
Which of the following strategies should Dhavid pick:
A: Create three columnstore indexes: 
1. Containing TradeDate and Close
2. Containing TradeDate, High and Low
3. Container TradeDate and Volume
B: Create two columnstore indexes:
1. Containing TradeID, TradeDate, Volume and Close
2. Containing TradeID, TradeDate, High and Low
C: Create one columnstore index that contains TradeDate, Close, High, Low and Volume
D: Create one columnstore index that contains TradeID, Close, High, Low, Volume and Trade Date
🧐 Question🔧 Skill


Data Updates
Data Warehouse
2 mins


Trade Index
3 mins
🧐 Question🔧 Skill💪 Difficulty⌛ Time
Data Updates
Data Warehouse
Medium2 mins
Trade Index
Medium3 mins
Reason #4

1200+ customers in 75 countries

customers in 75 countries

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 ETL Assessment 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 ETL Assessment 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

How do you customize this test?

There are three levels of customization we do for an ETL assessment test based on your job description:

  1. Topics and difficulty level of the questions is decided based on the ETL projects that the candidate will work on once they join the role
  2. Questions related to secondary skills that go along with ETL like SQL/ MS SQL/ PL SQL, Linux, Bash scripts will be added
  3. Questions related to the ETL tool used in your company will be added. For example, Informatica and Talend are popular ETL tools used by ETL developers

About ETL Developer Roles

The term ETL stands for Extract, Transform, and Load. It is a process by which data is extracted and shifted from various sources into a data warehouse.


Data is extracted from the source system into the staging area. These sources can be text files, SQL servers, spreadsheets, or vendor data.


The data extracted from the previous process has to be cleansed, mapped, and transformed. This happens through the many validations that are set up for filtering and cleaning of data.


In this stage, data is loaded into the target warehouse database.

An ETL developer is an IT specialist who designs data storage and data warehousing systems.

Typical ETL Developer responsibilities include:

  • Designing, developing, and maintaining the data warehousing system to desired company specifications
  • Ensuring the data quality of the extracted data
  • Creating an enhanced data solution for the seamless delivery of data
  • Troubleshooting issues for optimized data flow

What roles can I use the ETL Assessment Test for?

  • ETL Developer
  • ETL Analyst
  • Senior ETL Developer
  • ETL Lead
  • Senior Engineer (ETL)
  • Data Stage Developer
  • Informatica ETL Developer
  • Data Engineer - ETL
  • BI Developer

What topics are covered in the ETL Assessment Test?

Data Warehouse
Data Mart
ETL Layer
Data Source Layer
Data Extraction Layer
Data Modeling
ER Data Model
Dimension Model
Fact Tables
Star Schema
Galaxy Schema
Snowflake Schema
Data Integration
Data Acquisition
Data Transformation
Data Access Types
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.

reduction in screening time

ETL Online Test FAQs

Can I evaluate other relevant skills like SQL in the same test?

Yes. We support screening multiple skills in a single test. You can review our standard SQL test to understand what type of questions we use to evaluate SQL skills. Once you sign up for any plan, you can request a custom assessment that will be customized to your job description. The customized assessment will include questions for all the must-have skills required for your ETL role.

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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