Bloomberg Senior Software Engineer Interview Questions and Answers

Q1. Moderate questions
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Q2. Asynchronous coding, async, mvc, sql, missing number program
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Q1. Coding and behavioral questions
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Q1. Make Kanbon board in react live coding
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Create a Kanban board in React during live coding interview
• Use React components to represent different sections of the Kanban board (e.g. To Do, In Progress, Done)

• Implement drag and drop functionality for moving tasks between sections

• Utilize state management (e.g. useState) to track the tasks and their statuses

• Style the board using CSS or a UI library like Material-UI
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Q2. Write unit testing for the same
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Unit testing is a software testing method where individual units or components of a software are tested in isolation.
• Identify the unit to be tested

• Write test cases to cover different scenarios

• Use testing frameworks like JUnit or NUnit

• Mock external dependencies for isolated testing
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Q1. Previous role related technical questions
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Q1. Same as round 1 from onsite team
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Q1. General HR questions
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Q1. Java8 Features Questions about Stream functions and Lambda Expression
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Q2. Microservices & Springboot (Sample code and Annotations)
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Q3. DB Query to find duplicates in a table, keeping first duplicate in answer.
Ans. 
DB query to find duplicates in a table, keeping first duplicate in answer.
• Use GROUP BY clause to group the records by the column(s) that may have duplicates

• Use HAVING clause to filter out groups with only one record

• Use MIN or MAX function to select the first record in each group

• Example: SELECT MIN(id), name, COUNT(*) FROM table GROUP BY name HAVING COUNT(*) > 1
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Q4. Springboot Profiles, Actuators and Response mapping.
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Q5. Code to map Employee Object from List to Hashmap using Stream API functions.
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Code to map Employee Object from List to Hashmap using Stream API functions.
• Create a List of Employee objects

• Use stream() method to convert List to Stream

• Use collect() method to convert Stream to HashMap

• Use Collectors.toMap() method to create HashMap

• Pass key and value mapping functions to toMap() method
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Q1. As python developer, basic questions asked and all concepts are to be explained to interviewwr with example
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Q1. Sql and python interview questions to solve in code editor.
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Q1. Related projects and my role into it
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Q1. HR explained about company policies and salary negotiation and notice period related things
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10 min aptitude test

3 coding problem to solve on hackerrank

Multiple choice test

Q1. Technical interview
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Q1. HR discussion and salary negotiations
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Q1. What is Difference between let var const,
Ans. 
let, var, and const are all used to declare variables in JavaScript, but they have different scoping rules and behaviors.
• let and const were introduced in ES6, while var has been around since the beginning of JavaScript.

• let and const are block-scoped, while var is function-scoped.

• Variables declared with const cannot be reassigned, while let and var can be.

• const variables must be initialized when they are declared, while...read more
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Q2. Sql and Mongo related questions such as fetch 3rd highest salary from employee table?
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Q3. What are the scope in javascript, describe each one.
Ans. 
Scopes in JavaScript determine the accessibility of variables and functions.
• Global scope: variables and functions declared outside any function are accessible globally

• Local scope: variables and functions declared inside a function are only accessible within that function

• Block scope: variables declared with let and const are only accessible within the block they are declared in

• Function scope: variables declared with var...read more
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Q4. What is callback hell, what is Promises?
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Callback hell is a situation where nested callbacks make code unreadable. Promises are a solution to this problem.
• Callback hell occurs when there are too many nested callbacks in asynchronous code

• It makes the code difficult to read and maintain

• Promises are a way to handle asynchronous operations without nested callbacks

• Promises can be used to chain multiple asynchronous operations together

• Promises have a resolve and re...read more
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Q5. What is express js and why it is used in web apps and what is body parser
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Express.js is a popular Node.js web framework used for building web applications. Body-parser is a middleware used to parse incoming request bodies.
• Express.js is a minimal and flexible Node.js web application framework that provides a robust set of features for web and mobile applications.

• It provides a way to handle HTTP requests and responses, routing, middleware, and more.

• Body-parser is a middleware used to parse inc...read more
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Q6. What are arrow functions
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Arrow functions are a concise way to write functions in JavaScript.
• They have a shorter syntax than traditional function expressions.

• They do not have their own 'this' keyword.

• They are not suitable for methods, constructors, or prototype methods.

• Example: const add = (a, b) => a + b;

• Example: const square = x => x * x;
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Q7. What is nodejs and difference between nodejs and javascript
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Node.js is a server-side JavaScript runtime environment.
• Node.js is built on top of the V8 JavaScript engine from Google Chrome.

• It allows developers to write server-side code in JavaScript.

• Node.js has a non-blocking I/O model, making it efficient for handling large amounts of data.

• Node.js has a vast library of modules available through npm (Node Package Manager).
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Q8. What is passport.js why it is used
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Passport.js is an authentication middleware for Node.js.
• Passport.js provides a simple way to authenticate users with various authentication strategies such as local, OAuth, OpenID, etc.

• It is highly customizable and can be integrated with any Node.js web application framework.

• Passport.js maintains user sessions and provides a consistent API for authentication across different strategies.

• Example: Using Passport.js with E...read more
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Q9. Difference between node and expressjs
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Node is a runtime environment for executing JavaScript code, while Express is a web application framework built on top of Node.
• Node provides the platform for running JavaScript code outside of a web browser

• Express is a lightweight framework that simplifies building web applications on top of Node

• Express provides features like routing, middleware, and templating that make it easier to build web applications

• Node and Expr...read more
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Q10. Why nodejs is single Threaded
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Node.js is single-threaded to optimize performance and simplify programming.
• Node.js uses an event-driven, non-blocking I/O model.

• This allows for efficient handling of multiple requests without creating new threads.

• Node.js also uses a single event loop to manage all I/O operations.

• This simplifies programming by eliminating the need for complex thread synchronization.

• However, Node.js can still take advantage of multi-cor
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Q1. A small data structures problem was given to solve
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Q2. A small web api asked to build which includes crud operations
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Q3. Question related to system design
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Q4. What is Function hoisting
Ans. 
Function hoisting is a JavaScript behavior where function declarations are moved to the top of their scope.
• Function declarations are moved to the top of their scope during the compilation phase.

• Function expressions are not hoisted.

• Hoisting can lead to unexpected behavior and bugs if not understood properly.
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Q5. What is event loops and phases
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Event loop is a mechanism that allows JavaScript to perform non-blocking I/O operations.
• Event loop is a loop that constantly checks the message queue and executes the next message if there is any.

• Phases are the different stages of the event loop, such as timers, I/O callbacks, idle, and poll.

• Event loop is crucial for Node.js to handle multiple requests simultaneously without blocking the main thread.

• Example: setTimeout...read more
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