10+ Senior Software Engineer L3 Interview Questions and Answers

An app similar to Shazam for identifying music

• Use audio fingerprinting to identify songs

• Integrate with music databases to retrieve song information

• Provide user-friendly interface for displaying song details

Design an on prem Case System for investigators

• Create a user-friendly interface for investigators to input case details

• Include features for assigning cases, tracking progress, and generating reports

• Implement security measures to protect sensitive case information

• Integrate communication tools for collaboration among investigators and stakeholders

Answers to various technical questions related to programming and database concepts.

• throw is used to throw an exception in Java, while throws is used in method signature to declare the exceptions that can be thrown by the method

• JIT compiler stands for Just-In-Time compiler, which compiles Java bytecode into native machine code at runtime for improved performance

• Compiler is a software program that translates high-level programming languages into machine code, while compellers ...read more

Given a list of intervals, find the non-overlapping intervals.

• Sort the intervals based on their start time.

• Iterate through the intervals and keep track of the latest end time.

• If the start time of the current interval is greater than the latest end time, add it to the non-overlapping intervals.

• If the start time of the current interval is less than or equal to the latest end time, skip it as it overlaps with the previous interval.

Tickets and tasks can be handled by prioritizing, assigning, tracking progress, and communicating effectively.

• Prioritize tickets based on urgency and impact on users.

• Assign tasks to team members based on their expertise and workload.

• Track progress using project management tools like Jira or Trello.

• Communicate effectively with team members and stakeholders to provide updates and gather feedback.

• Regularly review and update ticket statuses to ensure timely resolution.

Event loop in JavaScript is responsible for managing asynchronous operations by executing callback functions in a non-blocking way.

• Event loop is a mechanism that allows JavaScript to perform non-blocking I/O operations.

• It continuously checks the call stack and the callback queue, moving functions from the queue to the stack when the stack is empty.

• Event loop ensures that JavaScript remains responsive and can handle multiple operations simultaneously.

Closure in JavaScript is the combination of a function and the lexical environment within which that function was declared.

• Closure allows a function to access variables from its outer scope even after the outer function has finished executing.

• It is created whenever a function is defined within another function.

• Example: function outerFunction() { let outerVar = 'I am outer'; function innerFunction() { console.log(outerVar); } return innerFunction; } let newFunction = outerFunc...read more

Check if a binary tree is a Binary Search Tree (BST) by validating the inorder traversal.

• Perform an inorder traversal of the binary tree and store the elements in a list.

• Check if the list is sorted in ascending order. If yes, then the binary tree is a BST.

• Ensure that there are no duplicate elements in the binary tree.

Micro frontend architecture is an approach to front-end development where a single web application is composed of multiple smaller, independent applications.

• Each micro frontend is responsible for a specific feature or functionality

• Micro frontends can be developed, tested, and deployed independently

• They can be built using different technologies and frameworks

• Communication between micro frontends can be achieved through APIs or events

• Helps in scaling development teams and maint...read more

Thunks are functions that delay the evaluation of an expression, while sagas are middleware for handling side effects in Redux.

• Thunks are used in Redux to delay the evaluation of an action creator function.

• Sagas are used in Redux to handle side effects like asynchronous API calls.

• Thunks are simpler to implement compared to sagas.

• Thunks are synchronous, while sagas are asynchronous.

• Example: Thunk - const fetchData = () => dispatch => { // API call here }; Saga - function* fetc...read more

Redux is a predictable state container for JavaScript apps.

• Actions are dispatched to the store

• Reducers specify how the state changes in response to actions

• Store holds the state of the application

• Components subscribe to the store to get updates

Design a URL shortener system

• Use a unique identifier for each long URL to generate short URL

• Implement a mapping system to redirect short URL to original long URL

• Consider scalability and performance for high traffic volume

• Implement analytics to track usage and performance of short URLs

AWS EC2 instance is a virtual server in Amazon's Elastic Compute Cloud (EC2) service.

• Virtual server in Amazon's EC2 service

• Can be easily scaled up or down based on demand

• Can run various operating systems and applications

• Can be launched in different regions and availability zones

• Example: t2.micro, m5.large, c5.xlarge