Data Transformation Interview Questions

13 real Data Transformation questions asked in live technical interviews — each with a model answer. Updated weekly.

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Can you dig deeper into what technologies you used, how the process works, and explain briefly what technologies you have used or what kind of work you have done on a daily basis, and what kind of data or transformations you have dealt with?🟢 Easy · Behavioral · Asked 30×Can you dig deeper into what technologies you used, how the process works, and explain briefly what technology you have used or what kind of work you have done on a daily basis, and what kind of data or transformations you have dealt with?🟢 Easy · Behavioral · Asked 29×Add a new column called running salary to the dataset, computing the cumulative sum of salaries.🟡 Medium · Coding · Asked 1×When performing data transformations and cleaning, do you typically handle them in separate stages or within the same pipeline?🟡 Medium · Conceptual · Asked 1×Can you define a pre-hook?🟢 Easy · Conceptual · Asked 1×Can you explain ETL transformation?🟢 Easy · Conceptual · Asked 1×Have you done any migration type of projects before?🟡 Medium · Behavioral · Asked 1×Given the following customer data: Id | Email 1 | john.jones@xmail.com 2 | tracey.smith@newmail.com 3 | amy.sanders@royalmail.com 4 | rachel@gmail.com Create firstname and lastname columns with each value capitalized.🟢 Easy · Coding · Asked 1×How do you assign sequence to multiple transformation code files using a DAG so that the system knows which file to execute first?🟡 Medium · Conceptual · Asked 1×You have an input CSV file in a source location. Read the file, drop an existing column, and add a new derived column that increases the salary by three times. Provide a code snippet.🟡 Medium · Coding · Asked 1×Can you explain DBT in technical language?🟡 Medium · Conceptual · Asked 1×Can you explain DBT using layman terms with an example involving mango?🟢 Easy · Conceptual · Asked 1×In a customer CRM scenario, how would you handle data that needs to be inverted or transformed from the source format first?🟡 Medium · Conceptual · Asked 1×

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Data Transformation Interview Questions

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