Informatica Business Solutions Senior Software Engineer Interview Questions and Answers

Q1. Find longest palindromic substring in a given string.
Ans. 
Use dynamic programming to find the longest palindromic substring in a given string.
• Iterate through the string and expand around each character to find palindromes.

• Store the length of the longest palindrome found so far.

• Return the substring based on the start and end indices of the longest palindrome.
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Q2. How to serialize and deserialise a tree
Ans. 
To serialize and deserialize a tree, use a recursive approach to traverse the tree and store the data in a suitable format.
• Use pre-order traversal to serialize the tree by storing the node values in a list or string.

• For deserialization, reconstruct the tree by recursively building nodes from the serialized data.

• Consider using JSON or XML format for serialization to easily store and retrieve tree structure.
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Q3. Find if a given regex (containing ., * and lower case english chars) matches a given string.
Ans. 
Use regex library to match given regex with string.
• Use a regex library like re in Python to match the given regex with the string.

• Check if the regex matches the string using the library functions.

• Handle cases where the regex contains special characters like . and * appropriately.
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Q4. Explain about throttling and implement throttle function.
Ans. 
Throttling is a technique used to control the rate of requests sent to a server.
• Throttling helps prevent server overload by limiting the number of requests processed at a time.

• Implementing a throttle function involves setting a maximum request rate and delaying excess requests.

• Example: Implementing a throttle function in a web application to limit the number of API calls made to a third-party service.

• Example: Throttlin...read more
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Q1. Find squares of elements in a sorted array and return the sorted response.
Ans. 
Sort the squares of elements in a sorted array and return the sorted response.
• Iterate through the array and square each element.

• Store the squared values in a new array.

• Sort the new array and return it.
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Q2. Write a short promise example and implement your own promise
Ans. 
A promise is a commitment to do something in the future, typically used for asynchronous operations in JavaScript.
• Promises are used to handle asynchronous operations in JavaScript.

• They represent a value that may be available now, in the future, or never.

• Promises have three states: pending, fulfilled, or rejected.

• Example: new Promise((resolve, reject) => { setTimeout(() => resolve('Done!'), 1000); });
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Q3. Explain event loop, what are different types of queues in event loop
Ans. 
Event loop is a mechanism that allows for asynchronous execution of code by managing the order of events in a single thread.
• Event loop continuously checks the call stack for any functions that need to be executed, and processes them in a non-blocking manner.

• Different types of queues in event loop include microtask queue (Promise callbacks), macrotask queue (setTimeout, setInterval callbacks), and animation frame queue
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Q4. What is virtual DOM and why its faster
Ans. 
Virtual DOM is a lightweight copy of the actual DOM, used to improve performance by minimizing direct manipulation of the real DOM.
• Virtual DOM is a concept used in frameworks like React to optimize rendering performance.

• Changes are first made to the virtual DOM, which is then compared to the real DOM to identify the minimal updates needed.

• This approach reduces the number of actual DOM manipulations, resulting in faster...read more
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Q1. Reverse the linked list.
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Q1. Internel working of Hashmap
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Q1. Salary Discussion
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Q1. Why do we use SOLID principle, SRP and OCP violation?
Ans. 
SOLID principles help in creating maintainable, scalable, and flexible software.
• SOLID principles help in creating software that is easier to maintain and extend.

• Single Responsibility Principle (SRP) ensures that a class has only one reason to change, leading to more modular and cohesive code.

• Open/Closed Principle (OCP) states that a class should be open for extension but closed for modification, allowing for easy chang...read more
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Q2. What is singleton design pattern and how to implement it?
Ans. 
Singleton design pattern ensures a class has only one instance and provides a global point of access to it.
• Create a private static instance of the class within the class itself.

• Provide a public static method to access the instance.

• Ensure the constructor of the class is private to prevent instantiation from outside the class.

• Example: Singleton pattern is commonly used in database connections to ensure only one connectio
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Q3. OOPs based question: abstract vs interface, multiple inheritance, method overloading vs method overriding.
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Q4. Dependency injection- what is it and any use case where to use?
Ans. 
Dependency injection is a design pattern where components are provided with their dependencies rather than creating them internally.
• Dependency injection helps in achieving loose coupling between components.

• It makes components easier to test by allowing for easier mocking of dependencies.

• Use cases include injecting database connections, logging services, and external API clients into components.
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Q1. Multithreading and TPL related questions?
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Q2. How can we debug the any published dll?
Ans. 
Debugging a published dll involves using tools like Visual Studio debugger and logging mechanisms.
• Use Visual Studio debugger to attach to the process using the published dll

• Set breakpoints in the code to pause execution and inspect variables

• Use logging mechanisms to track the flow of execution and identify issues

• Check for any exceptions or errors thrown by the dll
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Q3. Data seeding in entity framework and how to map tables with entity?
Ans. 
Data seeding in Entity Framework involves pre-populating database tables with initial data. Mapping tables with entities involves defining relationships between database tables and entity classes.
• Data seeding in Entity Framework can be done using the 'Seed' method in the 'Configuration' class of the DbContext.

• To map tables with entities, use data annotations or Fluent API to define relationships between entities and da...read more
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Q4. Deployment related question in IIS.
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Q1. Salary negotiation related discussion
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DSA round leetcode style question

Q1. Design + Coding round for rate limiter
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Q1. Write Trigger Logic
Ans. 
Writing trigger logic involves defining actions to be taken when a certain event occurs in a database.
• Identify the event that will trigger the logic

• Define the actions to be taken when the event occurs

• Consider any conditions or constraints that need to be met for the trigger to fire
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Q2. Write Batch Class

Ans. 

A Batch Class is used in Salesforce to process records in batches.

• Batch classes are used to process large amounts of data in Salesforce.

• They are implemented by implementing the Database.Batchable interface.

• Batch classes have three main methods: start, execute, and finish.

• Example: public class MyBatchClass implements Database.Batchable { // implementation }

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