KONE Data Engineer Interview Questions and Answers for Experienced

Q1. Explain Compilation process steps?
Ans. 
Compilation process involves several steps to convert source code into executable code.
• Preprocessing: Includes header file inclusion, macro expansion, and conditional compilation.

• Compilation: Translates source code into assembly code.

• Assembly: Converts assembly code into machine code.

• Linking: Combines object files and libraries to create an executable file.

• Loading: Loads the executable file into memory and prepares it
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Q1. Why should we hire you?
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Q2. What is your family background?
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Q3. Tell me about yourself.
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Q1. Normalization in SQL, What is Cursor in SQL
Ans. 
Normalization in SQL is the process of organizing data in a database to reduce redundancy and improve data integrity. A cursor in SQL is a database object used to retrieve and manipulate data row by row.
• Normalization in SQL involves breaking down a large table into smaller tables and defining relationships between them to reduce redundancy.

• Cursors in SQL are used to fetch and process individual rows returned by a query...read more
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Q2. .Net Core and API based questions
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Q3. Abstract and interface difference
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Abstract classes can have both abstract and non-abstract methods, while interfaces can only have abstract methods.
• Abstract classes can have constructors, fields, and non-abstract methods along with abstract methods

• Interfaces can only have abstract methods and constants

• A class can implement multiple interfaces but can only inherit from one abstract class
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Q4. Const and read only difference in C#
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Const keyword is used to declare constants at compile time, while read-only keyword is used to create immutable fields that can only be assigned a value at runtime.
• Const values are determined at compile time and cannot be changed, while read-only values can only be assigned a value once at runtime.

• Const fields are implicitly static, while read-only fields are not.

• Example: const int x = 5; read-only int y = 10;
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Q5. Azure basic fundamental questions
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Q6. Sample query to join tables using SQL
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Sample query to join tables using SQL
• Use the JOIN keyword to combine rows from two or more tables based on a related column between them

• Specify the columns to be selected from each table

• Use the ON keyword to specify the join condition
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Q1. Tell me about yourself and projects
Ans. 
I am a data engineer with experience in building data pipelines and optimizing data storage for various projects.
• Developed ETL pipelines to extract, transform, and load data from multiple sources into a centralized data warehouse

• Implemented data modeling techniques to optimize database performance and ensure data integrity

• Worked on real-time data processing systems using technologies like Apache Kafka and Spark Streami...read more
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Q1. How are you going to do this job efficiently
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I will prioritize tasks, communicate effectively, utilize resources efficiently, and continuously improve my skills.
• Prioritize tasks based on importance and deadlines

• Communicate effectively with team members and stakeholders

• Utilize resources such as tools and technologies to streamline processes

• Continuously improve skills through training and learning opportunities
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Q1. Basic and advanced concepts
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Q1. Tell me about your work experience
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Q2. What's the new VRF tech in Daikin
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Q3. Ikwtr comparison for chiller and vrf
Ans. 
Chiller and VRF systems differ in their cooling capacity, efficiency, and cost.
• Chillers are better suited for large commercial buildings with high cooling loads.

• VRF systems are more efficient and cost-effective for smaller buildings or individual rooms.

• Chillers use water as a cooling medium, while VRF systems use refrigerant.

• Chillers require more maintenance and have a longer lifespan than VRF systems.

• VRF systems offer...read more
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Q1. How would you handle different meetings at a time.
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Q1. What are your salary expectations?
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Q2. What is your family background?
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Q3. Why are you looking for a change?
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