Principal Global Services Senior Data Engineer Interview Questions, Process, and Tips

End to end project architecture involves designing and implementing a data pipeline to process and analyze data from various sources.

• Define project requirements and goals

• Design data architecture including data sources, storage, processing, and analytics tools

• Implement data pipeline to extract, transform, and load data

• Ensure data quality and consistency throughout the pipeline

• Monitor and optimize performance of the data...read more

Implemented query optimization techniques to improve performance in data processing.

• Utilized indexing to speed up data retrieval

• Optimized SQL queries by rewriting them for better performance

• Implemented caching mechanisms to reduce redundant data processing

Using Common Table Expressions (CTEs) to delete duplicates in SQL query

• Use a CTE to identify duplicates by ranking rows based on a unique identifier

• Delete rows with duplicate ranks in the main query

Reverse a list without using inbuilt functions

• Create two pointers, one at the start and one at the end of the array

• Swap the elements at the two pointers and move them towards the center until they meet

• Repeat the process until the entire list is reversed

End to end project implementation involves taking a project from conception to completion, including planning, development, testing, and deployment.

• Define project goals and requirements

• Design data pipelines and architecture

• Develop and implement data processing algorithms

• Test and validate data quality and accuracy

• Deploy and monitor the project in production

• Iterate and improve based on feedback

SQL joins combine data from two or more tables based on a related column between them.

• Different types of SQL joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN.

• The number of records in the result of a join depends on the type of join and the data in the tables.

• For example, an INNER JOIN will only return records that have matching values in both tables, while a LEFT JOIN will return all records from the left...read more