Addepar Data Engineer Interview Questions and Answers

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Q1. Basic Questions about data warehousing
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Q2. Dbt Scenarios
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Q1. What is bigadata
Ans. 
Big data refers to large and complex data sets that are difficult to process using traditional data processing applications.
• Big data involves large volumes of data

• It includes data from various sources such as social media, sensors, and business transactions

• Big data requires specialized tools and technologies for processing and analysis
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Q2. How spark works
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Spark is a distributed computing framework that processes big data in memory and is known for its speed and ease of use.
• Spark is a distributed computing framework that can process data in memory for faster processing.

• It uses Resilient Distributed Datasets (RDDs) for fault-tolerant distributed data processing.

• Spark provides high-level APIs in Java, Scala, Python, and R for ease of use.

• It supports various data sources li...read more
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Q3. Explain your application
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Our application is a data engineering platform that processes and analyzes large volumes of data to provide valuable insights.
• Our application uses various data processing techniques such as ETL (Extract, Transform, Load) to clean and transform raw data into usable formats.

• We utilize big data technologies like Hadoop, Spark, and Kafka to handle large datasets efficiently.

• The application also includes machine learning al...read more
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Q1. About the project and technical aspect
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Hackerearth problem on reversing the string & one more array question

Q1. Reverse the string
Ans. 
Reverse a given string
• Use built-in functions like reverse() in Python

• Iterate through the string in reverse order and append characters to a new string

• Use stack data structure to reverse the string
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Q2. SQL based windowing function
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Q1. Project discussion
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Q2. SQL
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Q1. Explain surrogate key
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Surrogate key is a unique identifier used in databases to uniquely identify each record in a table.
• Surrogate keys are typically generated by the system and have no business meaning.

• They are used to simplify database operations and improve performance.

• Example: Using an auto-incrementing integer column as a surrogate key in a table.
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Q1. About project what are optimization you have done
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Sql queries not too difficult asked to write on google document.

Q1. It’s was for contractual position and had only one round which is technical and HR combined
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