Equiniti Senior Software Engineer Interview Questions and Answers

Q1. What are the OOPS concepts
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Q2. MultiThreading, synchronization
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Q1. Tell me about yourself
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Q1. Technical question
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Q2. Java oops and write a program for remove duplicates
Ans. 
Java program to remove duplicates from an array of strings using OOPs concepts.
• Create a HashSet to store unique strings.

• Iterate through the array and add each string to the HashSet.

• Convert the HashSet back to an array to get the unique strings.
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Q1. Technical skills related questions
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Q2. Hands on / live coding
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Q1. Deep knowledge checking for mentioned skill
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Aptitude test with aptitude based questions

Q1. What is variable hoisting.
Ans. 
Variable hoisting is a behavior in JavaScript where variable declarations are moved to the top of their scope during compilation.
• Variable declarations are hoisted to the top of their function or global scope.

• Only the declarations are hoisted, not the initializations.

• This can lead to unexpected behavior if variables are accessed before they are declared.
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Q2. What is closures in js
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Closures in JavaScript allow functions to access variables from an outer function even after the outer function has finished executing.
• Closures are created whenever a function is defined within another function.

• Inner functions have access to the outer function's variables even after the outer function has returned.

• Closures are commonly used to create private variables and functions in JavaScript.

• Example: function outer...read more
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Q1. How do you read an external text file
Ans. 
To read an external text file, you can use file handling techniques in programming languages like Python or Java.
• Use file handling functions like open(), read(), and close() in Python to read an external text file.

• In Java, use classes like FileReader and BufferedReader to read text files.

• Specify the file path and mode (read mode) when opening the file.

• Read the contents of the file line by line or as a whole, depending ...read more
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Q2. Write a java program to find the occurrences of characters
Ans. 
Java program to find occurrences of characters in a string
• Create a HashMap to store characters and their counts

• Iterate through the string and update the counts in the HashMap

• Print the characters and their counts from the HashMap
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Q1. How to manage memory management in Python?
Ans. 
Memory management in Python involves automatic memory allocation and deallocation through garbage collection.
• Python uses automatic memory management through garbage collection, so manual memory management is not required.

• Use tools like memory_profiler to identify memory leaks and optimize memory usage.

• Avoid creating unnecessary objects and use data structures efficiently to minimize memory usage.
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Q2. Difference between Async , Sync and multithread?
Ans. 
Async is non-blocking, Sync is blocking, Multithread allows multiple threads to run concurrently.
• Async allows the program to continue executing other tasks while waiting for a response, commonly used in web development with AJAX calls.

• Sync blocks the program until a task is completed, commonly used in simple sequential programs.

• Multithreading allows multiple threads to run concurrently, improving performance by utilizi...read more
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Q3. CI/CD pipeline deployment?
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Q4. How to revert last commit?

Ans. 

Use 'git revert' command to revert the last commit.

• Use 'git log' to find the commit hash of the last commit

• Run 'git revert ' to revert the last commit

• Commit the revert changes with a new commit message

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