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ETL Assessments

The ETL 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.

Customized Based On:

  • Experience/ difficulty level
  • Multiple skills in 1 assessment
  • Job description/ role requirements

Covered Topics:

Automate ETL jobs
Data Pipelines
Data Warehouse Architecture
Data Warehouse Layers
Data Access Types
Data Modeling
Star and snowflake schemas
Data Transformation
See full list
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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.

Human Resources Manager

Singapore Government

reduction in screening time

How to use the Adaface ETL Online Test

Start screening candidates within minutes with the ready-to-go ETL Test

1. Choose the most appropriate test for your role

2. Start inviting candidates to complete the assessment

3. Receive real time notifications and shortlist the best candidates

Customize the Adaface ETL Test according to your job description

1. Get a custom assessment from our library of 500+ skills within 48 hours

2. Start inviting candidates to complete the assesment

3. Receive real time notifications and shortlist the best candidates

Adaface ETL Test is trusted by enterprises worldwide

Morgan Stanley
SG Government
Ernst and Young
Optimum Solutions
United Nations
Love Bonito

About the Adaface ETL Assessment Test

Evaluate ETL technical skills with Adaface skills assessment platform powered by an intelligent chatbot.


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

Recommended Roles:

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

Why You Should Use This ETL Online Assessment Test

The ETL (Extract, Transform, and Load) 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 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.

How do you customize this test?

There are three levels of customization we do for an ETL assessment 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

Distribution Of Test Scores

The actual score distribution will vary based on your candidate pipeline quality, but you should typically expect ~20% of the candidates to do well on Adaface assessments.

The score distribution for our assessments follow the normal curve. This is a good sign- standardized tests like SAT and GRE follow the normal distribution (bell curve).

Status quo assessments typically have the exact opposite of the bell curve (too many candidates getting close to 0, too many candidates getting close to 100 and too few candidates in the middle). This is typically because they focus on theoretical questions or trick questions, which are very binary in nature- either you know the trick/ theory or you don’t.

How Adaface Is Different

Adaface conversational assessments are reflective of on-the-job skills and see an 86% completion rate as compared to ~50% for traditional assessment platforms.



Theoretical questions/ puzzles

Feels like a test

One-size-fits-all assessments




Questions for on-the-job skills




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.

What is a custom assessment?

Every role is different and requires a custom assessment to identify top candidates efficiently. Adaface subject matter experts understand your job description/ role requirements and pick the most relevant questions from our library of 10000+ questions to create a technical assessment that helps you find the qualified candidates in your candidate pipeline quickly. All custom assessments are set up based on the job description, role requirements, must-have skills, experience level and salary range within a maximum of 48 hours and you will get an email notification once it goes live.

Check out a sample assessment here (no credit card required).

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.

How is Adaface different from other assessment tools?

We believe that status quo tech assessment platforms are not a fair way for companies to evaluate engineers because they focus on trick questions/ puzzles/ niche algorithms. We started Adaface to help companies find great engineers by assessing on-the-job skills required for a role. Read more about why we started Adaface.

Here's what's different with Adaface:

  • High quality non-googleable questions that test for on-the-job skills as opposed to theoretical knowledge.
  • A friendly conversational assessment with a chatbot, instead of sending a "test" to a candidate. This translates to a higher completion rate. Adaface assessments (86% candidate completion rate), as opposed to traditional tests (40-50% candidate completion rate)
  • Customized assessments for 700+ skills at different experience levels.

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

We have the following anti-cheating features in place:

  • Web proctoring
  • Webcam proctoring
  • Plagairism detection
  • Non-googleable questions
  • 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?

The platform is completely self-serve, so here's one way to proceed:

  • You can sign up for free to get a feel for how it works.
  • The free trial includes one sample assessment (Java/ JavaScript) that you will find in your dashboard when you sign up. You can use it to review the quality of questions, and the candidate experience of a conversational test on Adaface.
  • To review the quality of questions, you can also review our public questions for 50+ skills here.
  • Once you're convinced that you want to try it out with real assessments and candidates, you can pick a plan according to your requirements.

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.

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

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