CommScope Engineer III Interview Questions and Answers

Q1. Basic techno managerial questions on tech you worked on work, interests, challenges you faced. Was fairly short.
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Initially had a string based coding problem. Then was asked technical questions and then had a small break before doing system design with same interviewer for building book my show system and db schema.

Q1. Had a discussion with hiring manager on expectations, salary and growth.
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It was basic coding to test the Python skills like reading data from local and uploading in cloud then some basic dag related questions

Q1. Clustering and partition difference in data warehousing solutions
Ans. 
Clustering involves grouping similar data together, while partitioning involves dividing data into smaller, manageable sections.
• Clustering is used to group similar data points together based on certain criteria, such as customer segments or product categories.

• Partitioning involves dividing a large dataset into smaller, more manageable sections for easier data retrieval and processing.

• Clustering is often used for data a...read more
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Q2. What are the different approaches to Optimising SQL
Ans. 
Different approaches to optimizing SQL include indexing, query optimization, and database design.
• Use indexing to improve query performance

• Optimize queries by avoiding unnecessary joins and using appropriate functions

• Design the database schema efficiently to reduce redundancy and improve data retrieval speed
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Q3. Spark and it’s architecture
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Q4. Finding the count of Item bought by an customer from Flipkart during a year excluding February
Ans. 
To find the count of items bought by a customer from Flipkart during a year excluding February, you need to aggregate the data and filter out February transactions.
• Aggregate the data by customer and item purchased

• Filter out transactions from February

• Count the number of items bought by each customer
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DSA and Algorithm Questions

Q1. System Design Quesrtions
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Q2. Explain Previous Projects you have worked- And in dept micro-service questions
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Q1. Domain related questions
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Q2. Programming questions
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Q1. Question related to projects worked on
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Q2. Domain related questions
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Q1. Project design the system
Ans. 
Designing a system involves creating a plan for how all components will work together to achieve the desired outcome.
• Identify the requirements and goals of the project

• Create a high-level design outlining the system architecture

• Break down the system into smaller components and design each one individually

• Consider scalability, reliability, and performance in the design

• Test the design to ensure it meets the requirements a
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Q2. Nature of work done related to
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I have experience leading teams in designing and implementing complex software systems.
• Led a team in developing a new customer relationship management system for a large corporation

• Designed and implemented a real-time data processing system for a financial institution

• Managed a project to upgrade an existing e-commerce platform with new features and improved performance
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Python and SQL Questions (Easy to Medium)

Q1. Project Work Discussion
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Q2. SQL Coding (Can be with an online compiler)
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Q3. Python Coding (Can be with an online compiler)
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Q4. PySpark Coding (All the coding answers have to be submitted to the interviewer)
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Q5. PySpark Joins, and Databricks, and Vanilla Spark difference
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Q1. SQL 2 Questions (Easy to Medium) (Maybe on the compiler)
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Q2. Python (Easy) (Maybe on compiler)
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Q3. Scenario-based questions on the project
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Q1. Sql question related to windows function
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Q2. Unix basics - find a word in a set of files
Ans. 
Using Unix command 'grep' to find a word in a set of files
• Use 'grep' command followed by the word you want to search for and the file(s) you want to search in

• Add the '-r' flag to search recursively in all files in a directory

• Use '-i' flag for case-insensitive search

• Example: grep 'hello' file.txt

• Example: grep -r 'error' /path/to/directory

• Example: grep -i 'apple' file1.txt file2.txt
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Q3. Python question related to file system, regex
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Q1. Find nth elements from last in linked list
Ans. 
Use two pointers to find the nth element from the end of a linked list.
• Use two pointers, one moving n steps ahead of the other

• When the first pointer reaches the end, the second pointer will be at the nth element from the end
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Q2. Difference between hashmap and concurrent hashmap
Ans. 
HashMap is not thread-safe while ConcurrentHashMap is thread-safe and allows concurrent access.
• HashMap is not thread-safe and can lead to ConcurrentModificationException if accessed by multiple threads simultaneously.

• ConcurrentHashMap allows concurrent access by multiple threads without the need for external synchronization.

• ConcurrentHashMap achieves thread-safety by dividing the map into segments, allowing multiple th...read more
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Q1. Tell me about your past experience?
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