DBS Bank Data Engineer Interview Questions and Answers

Q1. Load 60 GB of csv file and perform transformation.
Ans. 
Use distributed computing framework like Apache Spark to efficiently load and transform the large CSV file.
• Use Apache Spark to distribute the workload across multiple nodes for faster processing.

• Utilize Spark's DataFrame API to read the CSV file and apply transformations.

• Consider partitioning the data to optimize performance.

• Use Spark SQL for complex transformations and aggregations.

• Leverage in-memory processing capabi
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The first round which is online assessment for eliminating candidates was conducted consist of medium level aptitude questions there were 3 sub sec have duration of 20 15 15 minutes and questions 15 10 10 respectively and you cannot move to further section there is time constraints for each then followed by 15 minutes psychometric section having 50 questions that's all for screening round the total duration was 65 min.
Total 24 candidates were selected from this round out of 200 plus

Q1. What motivates to you for this job ?
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Q2. What are the risks you have taken in previous role?
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Q3. How do you handle the situation when your opinion differ from your senior members in your team?
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Q4. Provide a approach to develop ETL pipeline where csv file is dropped in S3 and transform through airflow and load to snowflake.
Ans. 
Develop ETL pipeline using Airflow to process CSV files in S3 and load data into Snowflake.
• Set up an S3 sensor in Airflow to detect when a new CSV file is dropped in the specified bucket.

• Create a custom Python operator in Airflow to read the CSV file from S3, perform necessary transformations, and load data into Snowflake.

• Use SnowflakeHook in Airflow to establish connection with Snowflake and execute SQL queries to loa...read more
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Discussion of jd, technical questions on spark

Q1. Spark framework
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Q2. Spark dataframes
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Q1. Current ctc getting
Ans. 
I am currently earning $80,000 per year.
• My current annual salary is $80,000.

• I am earning $6,666.67 per month.

• I receive a monthly salary of $6,666.67.
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Q2. Expected CTC that is needed
Ans. 
Expected CTC should be based on industry standards, experience, skills, and location.
• Research industry standards for Data Engineers in your location

• Consider your level of experience and skills

• Factor in the cost of living in the area where the job is located

• Negotiate based on the value you bring to the company
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Q1. Airflow SQL Python DWH
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Q1. Airflow Pyspark SQL AWS
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Q1. Relocation , tech stack
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Q1. What is an index and what does it do
Ans. 
An index is a data structure that improves the speed of data retrieval operations in a database by allowing quick access to specific data.
• Indexes are used to quickly locate data without having to search every row in a database table.

• They are created on specific columns in a table to speed up queries that filter or sort by those columns.

• Examples of indexes include primary keys, unique keys, and non-unique indexes.
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Q1. Tell me a time you resolve conflict
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Q1. More related towards Hadoop, Spark, scenario based competency questions
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Q1. Code performance, optimization, batch processing
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