Persistent Systems Senior Software Engineer 2 Interview Questions and Answers

You need to give a coding test which is for 4.5 hours, where you are given a scenarios and you need to create API to fetch the response from an external API and according parse the response for whatever you need and perform some business logic for same.

Q1. Technical questions based on the code you had submitted earlier, and then again they check you for technical skills based on patterns, junit, threading, security, deployments etc
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Q2. What is the need for @Service annotation?
Ans. 
The @Service annotation is used in Spring framework to indicate that a class is a service component.
• Used to mark a class as a service component in Spring framework

• Helps in auto-detection and auto-configuration of Spring beans

• Facilitates dependency injection and inversion of control
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Q1. Here you are given a particular scenario and based on that you need to draw system diagram for same and explain them about why and what is needed.
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Q2. Draw a system diagram for ecommers system to place an order and get order history for a particular customer
Ans. 
System diagram for e-commerce order placement and history retrieval
• Frontend: Customer interface for browsing products, adding to cart, and placing orders

• Backend: Order processing system to handle order placement, payment processing, and order fulfillment

• Database: Store customer information, order details, and order history for retrieval

• APIs: Communication between frontend, backend, and database for seamless order proce...read more
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Q1. This round is to check what kind of behavior you showcase in certain situations and what kind of challenges you face in current team structure
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Q1. This round again judges you on cultural fitment, where they check what do you currently do and what kind of challenges or conflicts you face in team structure.
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Coding programm on the tech stack
Mentioned in resume

Q1. All technical question and discussion on challenges and expertise related to the IT industry expertise
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Arrays based 1 hours

Q1. What is hooks ? explain
Ans. 
Hooks are a feature in React that allow you to use state and other React features without writing a class.
• Hooks are functions that let you use state and other React features in functional components.

• They allow you to reuse stateful logic without changing your component hierarchy.

• Examples of hooks include useState, useEffect, useContext, and useReducer.
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Q2. What is DOM ? virtual
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DOM (Document Object Model) is a programming interface for web documents that represents the structure of a document as a tree of objects.
• DOM stands for Document Object Model.

• It is a programming interface for web documents.

• DOM represents the structure of a document as a tree of objects.

• It allows programs and scripts to dynamically access and update the content, structure, and style of a document.

• Example: Using DOM, Jav...read more
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Q1. Written assignment followed by one on one.
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Q1. This was basically managerial round, not much technical.
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Q1. Client round, not much on technical.
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Q1. Normal javascript questions
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Q2. Es6 features and benefits
Ans. 
ES6 (ECMAScript 2015) introduces new features like arrow functions, classes, template literals, and more.
• Arrow functions provide a more concise syntax for writing functions.

• Classes allow for easier object-oriented programming.

• Template literals make it easier to work with strings by allowing interpolation and multiline strings.

• Let and const provide block-scoped variables, reducing the risk of variable hoisting issues.

• De...read more
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Q3. Features in react new version
Ans. 
React new version includes features like concurrent mode, suspense, and improved hooks.
• Concurrent mode allows rendering of multiple components without blocking the main thread.

• Suspense enables better handling of loading states and data fetching.

• Improved hooks provide more flexibility and reusability in functional components.
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Q4. Typescript features and benefits
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Typescript is a superset of JavaScript that adds static typing and other features for improved code quality and developer productivity.
• Static typing helps catch errors at compile time

• Enhanced code readability and maintainability

• Support for modern JavaScript features like async/await

• Improved tooling and IDE support

• Compatibility with existing JavaScript codebases
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Q1. Interview Questions about Java, Spring boot and other technical frameworks you worked on
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Q2. Implement Binary search tree
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Binary search tree is a data structure where each node has at most two children, with the left child being less than the parent and the right child being greater.
• Start with a root node and insert new nodes by comparing values and traversing left or right accordingly.

• Implement functions for insertion, deletion, search, and traversal (inorder, preorder, postorder).

• Ensure the tree remains balanced to maintain efficient se
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Q3. How hash map works in java
Ans. 
HashMap in Java is a data structure that stores key-value pairs and allows for fast retrieval of values based on keys.
• HashMap uses hashing to store key-value pairs in an array of linked lists.

• It uses the hashCode() method of keys to determine the index where the value will be stored.

• If two keys have the same hashCode, they are stored in the same linked list at that index.

• HashMap allows null keys and values, but only on...read more
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Q1. Salary discussion
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Basic leet code questions on your desired language

Q1. What are different types of api methods have you used and where
Ans. 
I have used various types of API methods including GET, POST, PUT, and DELETE.
• GET method is used to retrieve data from a server. For example, I have used GET method to fetch user information from a user API endpoint.

• POST method is used to send data to a server to create a new resource. I have used POST method to create new records in a database through API calls.

• PUT method is used to update existing data on a server. F...read more
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