Sigmoid Lead Software Engineer Interview Questions and Answers

Q1. Maximal rectangal
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Q2. Loop in linked list
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Loop in linked list is a situation where a node points to a previous node in the list, creating an infinite loop.
• Check for loops using Floyd's cycle detection algorithm

• Use two pointers, one moving twice as fast as the other, to detect a loop

• If the fast pointer catches up to the slow pointer, there is a loop
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Q1. Basic hr question regarding your project and all
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Q2. He was more interested in what is my thinking pattern
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Q1. What is difference between function and stored procedure
Ans. 
Functions return a single value, while stored procedures can perform multiple operations and return multiple values.
• Functions return a single value, while stored procedures can return multiple values.

• Functions are called in SQL statements, while stored procedures are called using EXECUTE statement.

• Functions cannot have output parameters, while stored procedures can have output parameters.

• Functions cannot modify server ...read more
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Q2. How to implement custom exception in MVC
Ans. 
Custom exceptions can be implemented in MVC by creating a new class that inherits from Exception class.
• Create a new class that inherits from Exception class

• Override the constructor to pass a custom message to the base Exception class

• Throw the custom exception in the MVC controller or service layer
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Q1. What fifo? diff btwn fifo and lifo
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FIFO stands for First In, First Out. LIFO stands for Last In, First Out.
• FIFO is a method for organizing and manipulating a data buffer, where the first element added is the first to be removed.

• LIFO is a method where the last element added is the first to be removed.

• FIFO is like a queue, while LIFO is like a stack.

• Example: In a FIFO queue, if elements A, B, and C are added in that order, they will be removed in the same...read more
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First round was on Hacker Earth

Q1. Technical round was on Spring Data Jpa, Pagination, SOLID principles
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Q1. Core java concepts,Sql queries,2 coding question based on arrays and string
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Q2. Reverse the string
Ans. 
Reverse a given string
• Use a loop to iterate through the characters of the string

• Swap the characters from start to end to reverse the string

• Return the reversed string
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Q3. Find third highest salary from a employee table
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Q1. Advance java and project related
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Q2. Springboot and spring diff
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Q3. Springboot annotations used in your project
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Some common Springboot annotations used in projects are @RestController, @Autowired, @RequestMapping, @Service, @Component, @Repository.
• @RestController - Used to define RESTful web services.

• @Autowired - Used for automatic dependency injection.

• @RequestMapping - Used to map web requests to specific handler methods.

• @Service - Used to indicate that a class is a service.

• @Component - Used to indicate that a class is a Spring...read more
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Q4. Springboot dependencies
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Q1. Basics of sql and some coding questions
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Q2. Data structures
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Q1. Putin arrays strings
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Q1. Concepts of OOPS
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It was an easy test. It consisted of MCQs and two coding qns. Prepare SQL well. It also had 2 programming question. Both were medium difficukty

Q1. It was mainly focussed on my projects. Be thorough with you resume. But it also depends on the interviewer.
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