Iksula Senior Software Engineer Interview Questions and Answers

I was asked t solve 2 coding questions got 20 minutes for each, both were on DS and Algo moderate problems. 1 on trees and second on linked list.

Q1. System design round where i was asked to design a parking lot followed by few DB questions
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Q1. Then there was a UI round where i had to answer few Typescript questions and then was given a case study which i had t solve and propose a UI/UX solution.
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Q1. WAP to count Duplicate String using Java 8
Ans. 
WAP to count Duplicate String using Java 8
• Use Java 8 Stream API to group and count duplicate strings

• Create a Map to store the count of each string

• Filter the map to get only the strings with count > 1

• Return the size of the filtered map as the number of duplicate strings
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Q2. Basic Questions on Collections framework , Spring boot
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Q1. Create Custom annotation
Ans. 
Custom annotations can be created using @interface in Java.
• Create a new interface with @interface keyword

• Add required elements and default values

• Use the annotation by adding @ followed by the annotation name

• Example: @CustomAnnotation(value = "example")

• Annotations can be used for compile-time checks or runtime behavior
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Q2. Memory management in Java 8
Ans. 
Java 8 uses automatic memory management through garbage collection.
• Java 8 uses a garbage collector to automatically manage memory.

• The garbage collector frees up memory by removing objects that are no longer in use.

• Java 8 introduced the G1 garbage collector which is designed to reduce pause times.

• Developers can also use tools like jmap and jstat to monitor memory usage.
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Q3. What algo Java 8 Garbage collector follow
Ans. 
Java 8 Garbage collector follows the algorithm called G1 (Garbage-First).
• G1 divides the heap into regions and collects garbage in small portions called 'garbage-first' regions.

• It uses multiple parallel threads for garbage collection.

• G1 aims to minimize pause times by dynamically adjusting the amount of garbage collected in each region.

• It uses a combination of young and old generation collection to achieve better perfor...read more
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Q4. @retension annotation
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Q5. Java Design Patterns
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Q6. What is SOLID Principal? and Explain L into it?
Ans. 
SOLID is a set of principles for object-oriented programming. L stands for Liskov Substitution Principle.
• SOLID principles help in creating maintainable and scalable software.

• Liskov Substitution Principle states that objects of a superclass should be replaceable with objects of its subclasses without affecting the correctness of the program.

• This principle ensures that the behavior of the program remains consistent even ...read more
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Average coding test on arrays and string

Q1. Java 8 features, Microservices, Springboot features, kafka, docker and kubernetes, security
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Q1. Previous experience, technical insight, discussion on work culture
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Q1. Approach to resolve memory leak
Ans. 
Memory leaks can be resolved by identifying the source of the leak and freeing up the allocated memory.
• Use memory profiling tools to identify the source of the leak

• Analyze the code to find any unnecessary memory allocations

• Ensure all allocated memory is freed up after use

• Use smart pointers or garbage collection to automate memory management

• Test thoroughly to ensure the issue is resolved
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Q2. Approach to resolve memory
Ans. 
Memory issues can be resolved by identifying and fixing memory leaks, optimizing memory usage, and using appropriate data structures.
• Identify and fix memory leaks using tools like Valgrind or AddressSanitizer

• Optimize memory usage by reducing unnecessary allocations and deallocations

• Use appropriate data structures like arrays, linked lists, and hash tables

• Avoid using global variables and excessive recursion

• Consider usin...read more
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Q3. What is static storage class
Ans. 
Static storage class is used to declare variables that have a lifetime throughout the program execution.
• Variables declared with static storage class are initialized only once and retain their value between function calls.

• They have a default value of 0 if not initialized explicitly.

• Static functions and variables are only visible within the file they are declared in.

• Static variables can be used to count the number of tim...read more
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Q1. Design Patters, C#, SOLID Principles
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Q1. Design Patterns,C#,SOLID Principles
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Q1. Application Architecture, Coding Standards
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An online coding test at coderByte. Medium level question.

Q1. Find sum of distinct elements from two given array.
Ans. 
Sum of distinct elements from two arrays
• Create a set to store distinct elements from both arrays

• Iterate through each array and add elements to the set

• Calculate the sum of elements in the set
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Q2. Discussion around Java,Spring-boot.
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Q1. Core java questions related to collections, exceptions. SAGA design pattern, Adapter design pattern, proxy design pattern, Transational in MS
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