Zidio Development Data Analyst Interview Questions and Answers

Q1. Payments domain experience
Ans. 
Experience in working with payments domain in previous roles.
• Worked on payment processing systems

• Familiar with payment gateways and APIs

• Experience in fraud detection and prevention in payments

• Knowledge of regulatory requirements in payments

• Handled reconciliation of payments
Answered by AI
Add your answer

Q1. Intro about yourself
Add your answer
Q2. About the project
Add your answer

Basic coding question for intern

Advance question tech stack worked on, and about projects you have build.

Kind of HR and aptitude

Check whether a string is a valid parenthesis or not.

Q1. Spark optimizations
Add your answer
Q2. Pyspark quetions
Add your answer

Quant, Verbal, DI, Reasoning etc

Domain Based MCQ and 1 SQL Query + 1 Programming question

Q1. 1. Introduction 2. Project Explaination 3. DSA Questions: a) Strings b) Trees c) Graphs 4. What is Stream Processing?
Add your answer

Q1. 1.Ask about yourself 2.From which city you come from? 3. SWOT Analysis
Add your answer

Basic aptitude questions were asked of easy level.

Q1. Dbms , oops , C++ , sql , aws , powerpoint
Add your answer

Q1. What is Hoisting?
Ans. 
Hoisting is a JavaScript mechanism where variable and function declarations are moved to the top of their containing scope during compilation.
• Variable and function declarations are hoisted to the top of their scope.

• Only declarations are hoisted, not initializations.

• Function declarations take precedence over variable declarations.

• Hoisting can lead to unexpected behavior if not understood properly.
Answered by AI
Add your answer
Q2. What is Closures?
Ans. 
Closures are functions that have access to variables from their containing scope even after the parent function has finished executing.
• Closures allow functions to maintain access to variables from their outer scope

• They are created when a function is defined within another function

• Closures are commonly used in event handlers and callbacks
Answered by AI
Add your answer
Q3. What is Promises?
Ans. 
Promises are a way to handle asynchronous operations in JavaScript, providing a cleaner alternative to callbacks.
• Promises represent the eventual completion (or failure) of an asynchronous operation.

• They allow you to chain multiple asynchronous operations together.

• Promises have states: pending, fulfilled, or rejected.

• You can handle the result of a promise using .then() and .catch() methods.

• Example: const myPromise = new
Answered by AI
Add your answer
Q4. What is Callback Hell?
Ans. 
Callback Hell is a situation in asynchronous programming where multiple nested callbacks make the code hard to read and maintain.
• Occurs when multiple asynchronous operations are nested within each other

• Leads to deeply nested code which is hard to read and maintain

• Can be avoided by using Promises or async/await syntax
Answered by AI
Add your answer
Q5. What is Async/Await ?
Ans. 
Async/Await is a feature in JavaScript that allows for asynchronous programming using promises.
• Async/Await is syntactic sugar built on top of promises in JavaScript.

• It allows for writing asynchronous code that looks synchronous, making it easier to read and maintain.

• Async functions return a promise, which allows for chaining multiple asynchronous operations.

• Await keyword is used inside async functions to wait for a pro...read more
Answered by AI
Add your answer

Q1. Code A Todo List in React ?
Ans. 
A simple Todo List app built using React
• Create a new React project using create-react-app

• Create a Todo component to display the list of todos

• Use state to manage the list of todos and input field for adding new todos

• Implement functionality to add, delete, and mark todos as completed
Answered by AI
Add your answer
Q2. Difference Between RestApi and Graphql ?
Ans. 
REST API is a standard protocol for web services using HTTP, while GraphQL is a query language for APIs.
• REST API follows a client-server architecture with stateless communication, while GraphQL allows clients to request only the data they need.

• REST API typically uses multiple endpoints for different resources, while GraphQL uses a single endpoint for flexible data retrieval.

• REST API has predefined data structures, whil...read more
Answered by AI
Add your answer