FIS Lead Software Engineer Interview Questions and Answers for Experienced

Asked to write a bank application - which includes adding,removing,transferring of money

Design whatsapp; low level design interview

Q1. Design fare splitting app; both LLD & HLD
Ans. 
Design a fare splitting app for easy division of expenses among friends.
• Allow users to input expenses and split them among friends

• Implement features for adding friends, creating groups, and tracking balances

• Include options for equal split, custom split, and adjustments

• Generate reports for each user's share and overall expenses

• Consider security measures for payment integration

• Design user-friendly interface for seamless
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Technical sql questions

Oops concept and sql db questions

Q1. Dependency injection
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Q1. Java, spring boot, rest, microservices
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Q2. Database, sql, spring configuration,
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Q1. DSA round containing 2 coding questions along with some Java Questions
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Q1. Design Round along with some puzzles
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Q1. Managerial Round
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Codility Test with leetcode medium questions

Q1. Built a react feature
Ans. 
Built a react feature
• Identify the specific feature to be built

• Design the component hierarchy and state management

• Implement the feature using React components and hooks

• Test the feature for functionality and user experience

• Refactor and optimize the code for performance
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Q2. Questions based around react
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Q3. How to implement timer
Ans. 
A timer can be implemented using a combination of system time and a loop that checks for elapsed time.
• Get the current system time at the start of the timer

• Enter a loop that continuously checks the difference between the current system time and the start time

• When the desired time has elapsed, perform the desired action or trigger an event
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Q4. How to implement useEffect
Ans. 
useEffect is a hook in React that allows you to perform side effects in functional components.
• useEffect is used to handle side effects in React components.

• It takes two arguments: a function and an optional array of dependencies.

• The function inside useEffect is executed after the component renders.

• The optional array of dependencies determines when the effect should run.

• If the array of dependencies is empty, the effect r...read more
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Q1. What is java multithreading
Ans. 
Java multithreading is a feature that allows concurrent execution of multiple threads within a single process.
• Multithreading in Java allows multiple threads to run concurrently within a single process.

• Each thread has its own stack and executes independently, but shares the same memory space.

• Java provides built-in support for multithreading through the java.lang.Thread class and java.lang.Runnable interface.

• Multithreadi...read more
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Q2. Explain exception hierarchy
Ans. 
Exception hierarchy is a way to organize and categorize different types of exceptions in a software system.
• Exceptions are organized in a tree-like structure with a base class at the top and more specific exception classes below.

• Base class usually is 'Exception' or 'Throwable', with more specific classes like 'IOException', 'NullPointerException', etc.

• Subclasses can provide more specific information about the cause of t...read more
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Two sum related problem and advanced Priority Queue related questions

Q1. LLD and class diagram for Minesweeper game
Ans. 
LLD and class diagram for Minesweeper game
• Create classes for Board, Cell, Game, Player

• Use composition to represent relationships between classes

• Implement methods for revealing cells, flagging cells, checking for game over

• Consider using enums for cell states (covered, uncovered, flagged)

• Use UML notation to draw class diagram
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