Uttara InfoSolutions Software Development Engineer Interview Questions and Answers

Q1. Introduce yourself
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Q2. What has been your experience with framework design and implementation?
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Q3. What is the tech and languages you are comfortable with? Rate yourself on each.
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Q4. What is your experience with finance?
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Q5. What is TDD and BDD? What are the differences and which one do you prefer?
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Q1. Write a program to find the frequency of word in a sentence
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Q2. Write a program to check if the sum of digits of.the given number is a prime number
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Q3. Write an SQL query to get the second highest salary in the table
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Q4. What is the difference between abstract class and interface? Give a use case for both.
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Q5. Explain static and give it's use case.
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Q6. Where are objects stored in memory?
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During the coding test, I was asked to write a program to check the frequency of characters in a string.

Q1. What is Java , what are the four pillars of java
Ans. 
Java is a popular programming language known for its platform independence and object-oriented approach.
• Java is platform-independent, meaning it can run on any device with a Java Virtual Machine (JVM)

• Object-oriented programming is a key feature of Java, allowing for code reusability and modularity

• The four pillars of Java are: Inheritance, Encapsulation, Abstraction, and Polymorphism

• Inheritance allows a class to inherit...read more
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Q2. Related to collection framework
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Q3. What is recursion, write a code for it
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Recursion is a programming technique where a function calls itself to solve a problem.
• Recursion involves breaking down a problem into smaller subproblems and solving them recursively.

• A base case is needed to stop the recursion and prevent infinite loops.

• Example: Factorial calculation using recursion - function factorial(n) { return n === 0 ? 1 : n * factorial(n-1); }
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Q4. Why we don't use pointers in java
Ans. 
Java doesn't use pointers for security and simplicity reasons.
• Java uses references instead of pointers to avoid direct memory manipulation.

• Pointers can lead to memory leaks and security vulnerabilities.

• Java's garbage collection manages memory automatically, reducing the need for pointers.
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Q5. What are the difference between array and arraylist
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Array is a fixed-size data structure while ArrayList is a dynamic-size data structure in Java.
• Array is a fixed-size collection of elements of the same data type, while ArrayList is a dynamic-size collection that can grow or shrink.

• Arrays can store primitive data types and objects, while ArrayList can only store objects.

• Arrays require a specified size at the time of declaration, while ArrayList can dynamically resize it...read more
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Medium leetcode question on array list

Q1. Core java and collections, exceptions and threading
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Q2. Core java collections
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Q3. Multi threading
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Q4. Executor framework
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Q1. Threading related questions
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There were three coding questions.

Q1. Could you provide a thorough explanation of the project?
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Q2. OOps Concepts and question from the technical subjects
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Q3. Why Spring Boot
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Q4. JWT Authentication
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Q5. Docker and Kubernetes
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Test was for Web Development - React
75min test
3 Questions
1 Coding Question
2 Scenario based questions

Q1. React Optimization techniques
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Q2. React Advantages
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Q1. How to debug in production environment?
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Q1. Challenges faced during work and how you overcome?
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Q1. Why you choose Wells fargo over other offers?
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Q1. They grind u in javascript,typescript
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Q2. Html css, angular
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Q3. Deep preparation needed
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Q1. Project Architecture
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Q1. Informatica tech questions
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Q1. What is the difference between normal and arrow functions
Ans. 
Arrow functions are more concise and have a lexical 'this' binding compared to normal functions.
• Arrow functions do not have their own 'this' keyword, they inherit it from the parent scope.

• Arrow functions do not have their own 'arguments' object.

• Arrow functions cannot be used as constructors with 'new'.

• Arrow functions are more concise and have implicit return when no curly braces are used.
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Q2. All basic JS Questions to cover Hoisting closure
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Q3. They asked to show me an example using the API call
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Q4. Difference between forEach and Map
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forEach is used to iterate over an array and perform a function on each element, while map creates a new array by applying a function to each element.
• forEach does not return a new array, while map does

• forEach does not modify the original array, while map creates a new array

• forEach is used for side effects, while map is used for transformation

• Example: forEach - array.forEach(item => console.log(item)), map - const newAr
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