Salesforce Data Engineer Interview Questions and Answers

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. What are cyclic linked lists
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Cyclic linked lists are linked lists where the last node points back to the first node, creating a loop.
• Cyclic linked lists have no NULL pointers, making it difficult to determine the end of the list.

• They can be used to efficiently represent circular data structures like a round-robin scheduling algorithm.

• Detecting cycles in a linked list can be done using Floyd's cycle-finding algorithm.
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Q2. Coding question from BST
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Q1. About data modelling and Architecture
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Q2. Real world problem and solution
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Real world problem: Predicting customer churn in a subscription-based service
• Collect and analyze customer data such as usage patterns, demographics, and interactions

• Use machine learning algorithms to identify factors leading to churn

• Implement targeted retention strategies based on the analysis

• Monitor and evaluate the effectiveness of the strategies over time
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Q1. Sql technical round
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Q2. About various azure services
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Q1. About my work area
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Q2. Managerial and company fit
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Q1. Project discussion
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Q2. SQL
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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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Factorial coding questions and SQL coding questions using group by

Q1. Java questions on oops concepts
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Q2. SQL questions on having clause
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Q1. Can you relocate
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Q2. Brief info about amdocs
Ans. 
Amdocs is a software and services provider for communications, media, and entertainment industries.
• Founded in 1982 in Israel

• Headquartered in Chesterfield, Missouri

• Provides customer experience solutions for telecom companies

• Offers services such as billing, CRM, and data analytics
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