Persistent Systems PHP Developer Interview Questions and Answers

Asked simple tricky questions

Q1. Class Dependency Injection
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Q2. Questions was asked from oops concepts
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Q1. Simple question from your resume
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Coding related questions

Q1. Tell me about yourself
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Q2. What is your strength and weakness
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Q3. Why are you want to join this question and what is your salary expectation
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General aptitude, computer science fundamentals multiple-choice questions, and data structures and algorithms multiple-choice questions were asked.

Q1. Given a string, write a function to reverse the string.
Ans. 
Function to reverse a given string
• Create an empty string to store the reversed string

• Iterate through the input string in reverse order and append each character to the new string

• Return the reversed string
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Q2. Given a sorted array of integers, write a function to perform a binary search to find the index of a target value. If the target value is not found, return -1.
Ans. 
Binary search function to find target value in sorted array
• Define function that takes sorted array and target value as input

• Initialize variables for start, end, and middle indices

• Use while loop to iterate until start is less than or equal to end
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Q1. About the company
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Q2. What are three significant achievements in your life?
Ans. 
Graduating with honors, winning a hackathon, volunteering in a developing country
• Graduated with honors from university with a degree in Computer Science

• Won first place in a hackathon competition by developing a unique and innovative software solution

• Volunteered in a developing country to help build schools and provide education to underprivileged children
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Q1. Reverse an array using Java 8
Ans. 
Using Java 8, reverse an array of strings
• Use Arrays.stream() to convert the array to a stream

• Use Collections.reverse() to reverse the stream

• Use Collectors.toList() to convert the stream back to a list
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Q1. Code a controller class , service class, entity and repository
Ans. 
Code a controller, service, entity, and repository classes for a software application.
• Create a controller class to handle incoming requests and interact with the service layer.

• Develop a service class to implement business logic and interact with the repository.

• Define an entity class to represent data in the application.

• Implement a repository class to handle database operations for the entity.
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Q2. Basic questions about steams
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Q1. What is closure?
Ans. 
Closure is a function that has access to its own scope, as well as the scope in which it was defined.
• Closure allows a function to access variables from its outer function even after the outer function has finished executing.

• It helps in maintaining state in asynchronous operations.

• Example: function outerFunction() { let outerVar = 'I am outer'; return function innerFunction() { console.log(outerVar); }; }
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Q2. Define hooks in react?
Ans. 
Hooks in React are functions that let you use state and other React features without writing a class.
• Hooks were introduced in React 16.8 to allow functional components to have state and lifecycle methods.

• useState() is a hook that allows you to add state to functional components.

• useEffect() is a hook that allows you to perform side effects in functional components.

• Custom hooks are reusable functions that can contain log...read more
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Easy exam sample available on youtube

Q1. What are step functions.
Ans. 
Step functions are a type of serverless function that allow you to create workflows by chaining multiple functions together.
• Step functions are used to coordinate multiple AWS services into serverless workflows.

• They allow you to define a series of steps in a workflow, with each step being a separate function.

• You can use step functions to handle complex business logic, long-running processes, and error handling.

• Step func...read more
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Q2. How to scale lambdas
Ans. 
Scaling lambdas involves optimizing memory usage, increasing concurrency, and managing dependencies.
• Optimize memory usage by reducing unnecessary variables and objects

• Increase concurrency by using asynchronous programming and parallel processing

• Manage dependencies by breaking down functions into smaller, more modular components

• Consider using AWS Lambda Provisioned Concurrency for consistent performance
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Q1. How did you handled a difficult collegelue
Ans. 
I addressed the issue directly and professionally, seeking to understand their perspective and find common ground.
• Approached the colleague privately to discuss the issue

• Listened actively to their concerns and perspective

• Sought to find common ground and reach a resolution

• Maintained professionalism and respect throughout the conversation
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It had mcq and 1 hard coding question

Q1. They asked me about backtracking and dp series problem and also to solve the given question
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Q2. Java and in depth about different pillars of java
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