Zopsmart Technology Software Development Engineer Interview Questions and Answers

Q1. Tell me about yourself, sql vs no sql , project based and some DSA coding questions
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Q1. More detailed on projects and how goroutine implemented and restful api design and db design
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Q1. Introduce yourself
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Q2. Bubble sort was also asked
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Easy to medium level coding interview round.

Q1. Interview based on technical skills, computer science concepts and projects etc.
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Q1. K-Reverse a linked list. Have to code in Go lang as the role was for Go lang developer
Ans. 
K-Reverse a linked list involves reversing segments of the list of size K.
• 1. Define a linked list node structure with a value and a pointer to the next node.

• 2. Traverse the list in chunks of K nodes.

• 3. Reverse each chunk and connect it to the previous part of the list.

• 4. Handle cases where the last chunk has fewer than K nodes.

• Example: For K=2, list 1->2->3->4 becomes 2->1->4->3.
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Q1. Linkedlist insertion & deletion in Go
Ans. 
Linkedlist insertion & deletion in Go
• In Go, linked lists can be implemented using structs and pointers.

• Insertion involves creating a new node and updating the pointers of adjacent nodes.

• Deletion involves updating the pointers of adjacent nodes to bypass the node being deleted.

• Go's garbage collector automatically frees memory of unused nodes.
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Q2. Go lang concurrency and concurrency patterns
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Q1. SQL vs NoSQL and when to use what
Ans. 
SQL is best for structured data, NoSQL for unstructured. Use SQL for complex queries, NoSQL for scalability and speed.
• SQL is best for structured data, NoSQL for unstructured

• Use SQL for complex queries, NoSQL for scalability and speed

• SQL is ACID compliant, NoSQL is BASE

• Examples of SQL: MySQL, Oracle, PostgreSQL

• Examples of NoSQL: MongoDB, Cassandra, Redis
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Q2. DB queries on finding the second largest element
Ans. 
Query to find the second largest element in a database table
• Use ORDER BY and LIMIT to select the second largest element

• For MySQL: SELECT column FROM table ORDER BY column DESC LIMIT 1,1

• For Oracle: SELECT column FROM (SELECT column FROM table ORDER BY column DESC) WHERE ROWNUM <= 2 MINUS SELECT column FROM (SELECT column FROM table ORDER BY column DESC) WHERE ROWNUM <= 1
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Q3. Discussion on projects mentioned in the CV
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