EPAM Systems Big Data Engineer Interview Questions and Answers

Enhanced optimization in AWS Glue improves job performance by automatically adjusting resources based on workload

• Enhanced optimization in AWS Glue automatically adjusts resources like DPUs based on workload

• It helps improve job performance by optimizing resource allocation

• Users can enable enhanced optimization in AWS Glue job settings

Optimizing querying in Amazon Redshift involves proper table design, distribution keys, sort keys, and query optimization techniques.

• Use appropriate distribution keys to evenly distribute data across nodes for parallel processing.

• Utilize sort keys to physically order data on disk, reducing the need for sorting during queries.

• Avoid using SELECT * and instead specify only the columns needed to reduce data transfer.

• Use AN...read more

SCD type 2 is a method used in data warehousing to track historical changes by creating a new record for each change.

• SCD type 2 stands for Slowly Changing Dimension type 2

• It involves creating a new record in the dimension table whenever there is a change in the data

• The old record is marked as inactive and the new record is marked as current

• It allows for historical tracking of changes in data over time

• Example: If a cust...read more

I have over 5 years of experience in data engineering, working with large datasets and implementing data pipelines.

• Developed and maintained ETL processes to extract, transform, and load data from various sources

• Optimized database performance and implemented data quality checks

• Worked with cross-functional teams to design and implement data solutions

• Utilized tools such as Apache Spark, Hadoop, and SQL for data processing

• ...read more

I would start by understanding the requirements, breaking down the task into smaller steps, researching if needed, and then creating a plan to execute the task efficiently.

• Understand the requirements of the task

• Break down the task into smaller steps

• Research if needed to gather necessary information

• Create a plan to execute the task efficiently

• Communicate with stakeholders for clarification or updates

• Regularly track prog