Infosys Senior Application Developer Interview Questions and Answers

Q1. Bascis of Angular - Routing, version upgrade, DI ,AOT JIT , FORMS , Services , Observable, Promise , lifecyclle
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Q1. What is Oracle apps
Ans. 
Oracle Applications are a suite of business applications software that help organizations manage their business processes.
• Oracle Applications include modules for customer relationship management (CRM), enterprise resource planning (ERP), supply chain management (SCM), and more.

• They are designed to automate and streamline business processes, improve efficiency, and provide real-time insights.

• Examples of Oracle Applicati...read more
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Q2. Explain value sets
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Value sets are a collection of related values that can be used to define a set of acceptable values for a field or parameter.
• Value sets help ensure data consistency and accuracy by restricting the possible values that can be entered.

• They can be used in database fields, dropdown lists, or parameters in programming languages.

• For example, a value set for a 'gender' field may include values like 'Male', 'Female', and 'Othe
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Q3. Explain index in plsql
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An index in PL/SQL is a database object that improves performance by allowing faster retrieval of data from tables.
• Indexes are created on columns in a table to speed up the retrieval of rows based on the values in those columns.

• They work similar to an index in a book, allowing the database to quickly locate the rows that match a certain criteria.

• Indexes can significantly reduce the time it takes to retrieve data, espec...read more
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Q4. Explain joins in plsql
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Different types of joins in PL/SQL include inner join, outer join (left, right, full), cross join, and self join.
• Inner join: Returns rows when there is at least one match in both tables.

• Outer join: Returns all rows from one table and only matching rows from the other table (left, right, full).

• Cross join: Returns the Cartesian product of the two tables.

• Self join: Joins a table to itself.
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Q5. Explain functions in plsql
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Functions in PL/SQL are named blocks of code that can accept parameters, perform a task, and return a value.
• Functions are created using the CREATE FUNCTION statement.

• Functions can accept input parameters and return a single value.

• Functions can be called from SQL statements or other PL/SQL blocks.

• Functions can be used to encapsulate reusable logic and improve code readability.

• Example: CREATE FUNCTION calculate_area(leng...read more
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Q1. What are the types of exceptions ?
Ans. 
There are two types of exceptions: checked and unchecked.
• Checked exceptions are checked at compile-time and must be handled by the programmer.

• Unchecked exceptions are not checked at compile-time and can be handled by the JVM.

• Examples of checked exceptions include IOException and SQLException.

• Examples of unchecked exceptions include NullPointerException and ArrayIndexOutOfBoundsException.
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Q2. How will you handle exceptions of a procedure getting called in another procedure.
Ans. 
I will use try-catch blocks to handle exceptions and log the error message for debugging purposes.
• Enclose the procedure call in a try block.

• Catch the exception in the catch block.

• Log the error message for debugging purposes.

• Handle the exception appropriately based on the specific scenario.
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Q1. What are your salary expectations?
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Q2. Share details of your previous job.
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Q3. Why are you looking for a change?
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Hacker rank test was given, we need to clear that first.

Q1. Java8 features, collections, Security management in application
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Q2. Microservices, Spring boot concepts
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Q1. Current project discussion and joining date confirmation
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Q1. Swap the value of two variables without using the third variable
Ans. 
To swap the value of two variables without using a third variable, use arithmetic operations.
• Use addition and subtraction to swap values

• Example: a = 5, b = 10. a = a + b (a = 15), b = a - b (b = 5), a = a - b (a = 10)
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Q2. Basic javascript - Promises, Callbacks, difference in event handling in javascript & react.js
Ans. Synthetic events are present in React, syntax differences
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Q3. What is Context API
Ans. 
Context API is a feature in React that allows sharing data between components without having to pass props through every level of the component tree.
• Context API provides a way to pass data through the component tree without having to pass props down manually at every level.

• It is particularly useful for passing down global data like themes, user authentication, or language preferences.

• Context API consists of three main ...read more
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Q4. How do you orient some components in react with 40 or more pages? whats your approach?
Ans. 
Use a routing library like React Router to manage navigation and organize components into separate pages.
• Utilize React Router to set up routes for each page and handle navigation

• Organize components into separate folders based on their functionality or page they belong to

• Consider lazy loading components to improve performance, especially with a large number of pages
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Q5. How would you optimize an application?
Ans. 
Optimizing an application involves identifying and resolving performance bottlenecks to improve efficiency and user experience.
• Identify and address slow database queries or inefficient code

• Implement caching mechanisms to reduce load times

• Optimize images and assets to reduce file sizes

• Utilize asynchronous processing to improve responsiveness

• Profile and analyze code to identify areas for improvement
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Simple Hackerround test involving 50 MCQ's.

Q1. Focused on JAVA and spring boot framework questions. was asked one 1 DS problem on stack.
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Q2. Check balance paranthesis
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Q1. This round was focused on project discussion , where initially I was asked lot of questions on my tech stack and how do you work and deliver a software release to production. Then the manager took over an...read more
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I was asked about ReactJS and Node JS questions and 3 coding questions

Q1. Basic dax and questions on visualisations in power BI
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Q2. Basic SQL questions on joins and window functions.
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