Koch Engineered Solutions Senior Data Engineer Interview Questions and Answers

One question relates to Linked list and another related to string

Q1. Circular linked list algorithm
Ans. 
Circular linked list is a data structure where the last node points back to the first node.
• In a circular linked list, each node has a pointer to the next node and the last node points back to the first node.

• Traversal in a circular linked list can start from any node and continue until the starting node is reached again.

• Insertion and deletion operations in a circular linked list are similar to those in a regular linked ...read more
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Q2. String manipulation and logical questioning
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Q3. String creation and deletion
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Q4. DSA problem solving questions
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Q5. Logical questions asked and informed
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Mostly Aptitude, Reasoning,Verbal in the round-1 with 60 questions

2 programming questions - you can select which language u are comfortable

Q1. It's purely based on your resume, so which language u are comfortable they can prefer to ask that's the thing
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First round was GD1 - We were given a Topic of Democracy in India and have 5 mins to think on it..

Second round was GD2 - here, the Topic was "if you could have a superpower for one day what superpower you will choose" and we have to talk on this topic for 5 mins

Q1. Four pillars of OOPS with real world examples
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Q2. Solve Rotate Array Problem
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Q3. 8-10 questions asked on my Programming language (C++)
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Q1. Question asked on Final year project - what's your Contribution in the project
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Q2. Explain your Final year project
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Q3. Some logical question and puzzles
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Q4. There was alphanumeric characters and we have to output only the number from that string Input - "wih562idjedk42ndej56" Output - 5624256
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Q1. As a team Leader, how you manage all your team members when there is a conflict or disagreement arise in the project
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Q2. Some , Behavioural questions
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Q1. Asked to write a program to check whether string is valid or not. String consists of only three kind of special characters "(), [], {}". We need to return true if all special characters are in correct for...read more
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Q2. What is useRef hook used for?
Ans. 
useRef hook is used to persist a mutable value across renders without causing a re-render.
• Used to store mutable values that do not trigger re-renders.

• Commonly used for accessing DOM elements or storing previous values.

• Does not cause a re-render when the value changes.
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Q3. What are the best practices to avoid rerenders and to improve performance
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Use memoization, virtual DOM, and shouldComponentUpdate to avoid unnecessary rerenders and improve performance.
• Implement memoization to store the result of expensive function calls and avoid recalculating them.

• Use virtual DOM to efficiently update only the parts of the UI that have changed.

• Override shouldComponentUpdate to prevent unnecessary rerenders by comparing current and next props/state.
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Q4. What are callbacks, Promises, async await
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Callbacks, Promises, async await are asynchronous programming concepts in JavaScript.
• Callbacks are functions passed as arguments to another function to be executed later.

• Promises are objects representing the eventual completion or failure of an asynchronous operation.

• async await is a syntax for writing asynchronous code that looks synchronous, making it easier to read and maintain.

• Example: Using a callback to handle th...read more
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Write word count program

Q1. Architecture of Spark
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Q2. What is AWS Glue job
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Q1. Spark related questions
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Q2. Previous projects done
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Developed a real-time data processing system for a retail company to optimize inventory management.
• Designed and implemented data pipelines to ingest, process, and analyze large volumes of data

• Utilized technologies like Apache Kafka, Spark, and Hadoop for real-time processing

• Built dashboards and reports for stakeholders to monitor inventory levels and make data-driven decisions
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Q1. Most of questions from your project
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Q2. Oops concepts SQL joins
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Q3. Angular Data binding
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Q1. Angular project
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Q1. What are services in Drupal?
Ans. 
Services in Drupal are reusable objects that perform specific functions, such as database queries or sending emails.
• Services are defined in YAML files and can be accessed throughout a Drupal site.

• They are used to encapsulate reusable functionality and promote code reusability.

• Examples of services in Drupal include the database service for interacting with the database, the mail service for sending emails, and the logge
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Q2. How to debug in Drupal?
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Debugging in Drupal involves using tools like Devel module, watchdog(), and error logs.
• Enable Devel module for debugging information

• Use watchdog() function to log messages to Drupal's watchdog log

• Check error logs for PHP errors and warnings

• Use dpm() function to print variables for debugging purposes
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