DTCC Platform Engineer Interview Questions and Answers

Maths,verbal reasoning.
Like percentage,wages, proportional problems

Particular topic on political party

1 hour 10 mins, MERN Stack, Face to Face. Mongodb, medium DSA Question, callback, eventloop, NodeJS asynchronous working

Q1. Sort array and questions on project
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Q1. Count frequency of letters in a given string
Ans. 
Count frequency of letters in a given string
• Create an array of size 26 to store the count of each letter (assuming only lowercase letters)

• Iterate through the string and increment the count of each letter in the array

• Print the count of each letter in the array
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Q2. Closures, Temporal Dead Zone, Hoisting
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Q1. Technical Discussions on projects from resume and work
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Q2. Refresh tokens and access tokens, rate limiter
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Q1. Sql based questions, oops concepts, project related questions
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Q2. Recursion, Python, MVC, AWS services
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Q1. What is the difference between normal and arrow functions
Ans. 
Arrow functions are more concise and have a lexical 'this' binding compared to normal functions.
• Arrow functions do not have their own 'this' keyword, they inherit it from the parent scope.

• Arrow functions do not have their own 'arguments' object.

• Arrow functions cannot be used as constructors with 'new'.

• Arrow functions are more concise and have implicit return when no curly braces are used.
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Q2. All basic JS Questions to cover Hoisting closure
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Q3. They asked to show me an example using the API call
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Q4. Difference between forEach and Map
Ans. 
forEach is used to iterate over an array and perform a function on each element, while map creates a new array by applying a function to each element.
• forEach does not return a new array, while map does

• forEach does not modify the original array, while map creates a new array

• forEach is used for side effects, while map is used for transformation

• Example: forEach - array.forEach(item => console.log(item)), map - const newAr
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Basic Math and English Questions

Q1. Basic Dot Net Interview Questions
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Q1. Mostly Salary Negotiation
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Q1. Explain Javascript ES6 features.
Ans. 
ES6 introduced new features to Javascript including arrow functions, let and const, classes, and template literals.
• Arrow functions provide a concise syntax for writing functions.

• Let and const are block-scoped variables.

• Classes provide a way to create objects with methods and properties.

• Template literals allow for string interpolation and multi-line strings.

• Destructuring allows for easy extraction of values from arrays ...read more
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Q2. How an angular application works.
Ans. 
Angular is a front-end framework that uses HTML, CSS, and JavaScript to build dynamic web applications.
• Angular uses components to create reusable UI elements

• It uses services to share data and functionality across components

• It has a powerful template system that allows for easy data binding and manipulation

• Angular uses RxJS for reactive programming and observables

• It has a built-in router for handling navigation between ...read more
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Q3. What are components in angular
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Components in Angular are reusable building blocks that encapsulate HTML, CSS, and TypeScript code.
• Components are the basic building blocks of an Angular application

• They are reusable and can be used across multiple pages

• Each component has its own HTML, CSS, and TypeScript code

• Components can communicate with each other using @Input and @Output decorators

• Examples of components include navbar, footer, and login form
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Q1. How to set up the environment for building angular application
Ans. 
To set up the environment for building an Angular application, you need to install Node.js and Angular CLI.
• Install Node.js and npm

• Install Angular CLI using npm

• Create a new Angular project using CLI

• Run the project using ng serve command
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Q2. What is CI/CD pipeline
Ans. 
CI/CD pipeline is a process of continuous integration and continuous delivery/deployment of software.
• CI/CD pipeline automates the software delivery process.

• It involves continuous integration of code changes, automated testing, and continuous delivery/deployment of software.

• It helps in reducing errors and improving the quality of software.

• Popular CI/CD tools include Jenkins, Travis CI, and CircleCI.
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Q3. How comfortable are you learning and working on VueJS application
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