Data Engineering Test
For jobseekers
Practice your skills and earn a certificate of achievement when you score in the top 25%.
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About the test
The Data Engineering test assesses skills in collecting, transforming, and storing data, as well as building pipelines, ensuring quality, and supporting analytics.
The assessment includes work-sample tasks such as:
- Designing efficient data storage, partitioning, and sharding strategies.
- Building data pipelines, managing data formats, and ensuring data quality.
- Creating and optimizing data models for efficient storage and retrieval.
A good data engineer needs to be able to design, build, and maintain data infrastructure and pipelines in order to ensure that data is accessible, reliable, and ready for analysis.
Sample public questions
Your company’s data pipeline refreshes a daily orders analytics dataset using daily files from the source system. Sometimes, after the original daily file has already been processed, a later file arrives containing corrected or updated rows for previous dates.
Currently, the pipeline does not always apply late arriving rows correctly.
What changes should you make to resolve the issue?
As a data engineer at an electronic components factory, you have been tasked with improving the performance of the factory's information database. The database is experiencing slow read operations, and the factory plans to add several new servers to help with the problem.
The database includes several critical tables, including the ones mentioned below along with their related issues:
- Orders: The table is read-heavy and it's where recent orders are accessed most frequently, and has become a bottleneck due to its size.
- QualityControl: The table has numerous columns, many of which are rarely queried causing unnecessary data processing during reads.
What can be done to improve the mentioned issues while taking advantage of new servers?
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Earn a free certificate by achieving top 25% on the Data Engineering test with public questions.
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10 more premium Data Engineering questions
Sculpture Market, Retail Company Growth, Customer Behavior, Food Flavoring, Retail Store, Streaming Architecture, Food Delivery, Event Dashboard, Data Silos, Store Dashboard.
Skills and topics tested
- Data Engineering
- Data Modeling
- Database Schema
- Tables
- ETL
- Indexes
- Data Format
- File
- Data Quality
- Data Streaming
- Performance Tuning
- Data Storage
For job roles
- Data Engineer
Sample candidate report
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What others say
Simple, straight-forward technical testing
TestDome is simple, provides a reasonable (though not extensive) battery of tests to choose from, and doesn't take the candidate an inordinate amount of time. It also simulates working pressure with the time limits.
Jan Opperman, Grindrod Bank
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