7 Eleven Interview Questions and Answers

Q1. Node JS and React questions and snippet answers.
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Q2. Medium DSA question on arrays
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Q1. SOLID Principles, system design, LLD
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Q1. Design a system where 2 transaction should happen one after the other. Both should pass and if one fails none should be persist or eventually all txn should roll back
Ans. 
Design a system for sequential transactions with rollback on failure
• Use a transaction manager to coordinate the two transactions

• Implement a try-catch mechanism to handle failures and trigger rollback if needed

• Ensure that both transactions are part of the same unit of work
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Q2. Whats is Kafka, Partition, ConsumerGroup
Ans. 
Kafka is a distributed streaming platform, Partition is a way to divide data, ConsumerGroup is a group of consumers sharing the load.
• Kafka is a distributed streaming platform used for building real-time data pipelines and streaming applications.

• Partition is a way to divide data within a Kafka topic to allow for parallel processing and scalability.

• ConsumerGroup is a group of consumers that work together to consume data ...read more
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Q3. Exception handling in detail
Ans. 
Exception handling is a programming concept that deals with errors during program execution.
• Exception handling allows for graceful handling of errors in a program.

• It involves try, catch, and finally blocks to handle exceptions.

• Examples include catching divide by zero errors or file not found exceptions.
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Q4. How to handle hashmap Memory leak
Ans. 
To handle hashmap memory leak, ensure proper management of keys and values, use weak references, and periodically check for unused entries.
• Avoid storing unnecessary data in the hashmap

• Use weak references for keys or values if appropriate

• Periodically check for and remove unused entries to free up memory
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There are 2 questions on array and linkedlist

Q1. What is normalization ?
Ans. 
Normalization is the process of organizing data in a database to reduce redundancy and improve data integrity.
• Normalization involves breaking down a database into smaller, more manageable tables.

• It helps in reducing data redundancy by storing data in a structured manner.

• Normalization ensures data integrity by minimizing the chances of anomalies during data manipulation.

• There are different levels of normalization such a...read more
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Q2. Given a sample , write some nested quries.
Ans. 
Nested queries are used to retrieve data from multiple tables in a database.
• Use subqueries to retrieve data from a nested query within the main query.

• Use JOIN statements to combine data from multiple tables in a nested query.

• Nested queries can be used in SELECT, INSERT, UPDATE, and DELETE statements.
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Q1. Tell about the projects you did in college
Ans. 
I completed a project on optimizing supply chain processes for a local manufacturing company.
• Researched current supply chain processes and identified areas for improvement

• Implemented new inventory management system to reduce stockouts and excess inventory

• Collaborated with cross-functional teams to streamline procurement processes

• Presented findings and recommendations to company executives for implementation
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Q2. Tell about you understanding of supply chain in retain industry
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Q1. Salary discussion
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Q2. It is mostly WFO so are you comfortable in it
Ans. 
Yes, I am comfortable with WFO (Work From Office) as it is the primary mode of work.
• I have experience working in a WFO environment in my previous roles.

• I am familiar with the expectations and responsibilities of working in an office setting.

• I am adaptable and can easily transition between WFO and WFH (Work From Home) as needed.
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