10+ Interview Questions and Answers

Creating parking space for an airport

• Determine the number of expected passengers and their mode of transportation

• Calculate the average parking space required per vehicle type

• Identify the available land and its capacity for parking

• Consider the traffic flow and accessibility to the airport

• Evaluate the cost and feasibility of constructing a parking structure

• Explore alternative transportation options such as shuttle services or public transportation

Looking for new challenges and growth opportunities

• Desire to work on more complex projects

• Seeking a company with a strong culture and values

• Want to learn new skills and technologies

• Opportunity for career advancement

• Geographical relocation

• Better work-life balance

The release process involves preparing the app for submission, testing, uploading to the respective app stores, and managing the release.

• Prepare the app for submission by ensuring it meets all guidelines and requirements of the app stores.

• Test the app thoroughly to identify and fix any bugs or issues before release.

• Upload the app to the Play Store and Apple Store developer consoles.

• Manage the release by setting up release notes, updating metadata, and monitoring user feedback...read more

Given a sequence of buildings, find the number of buildings visible to the left and right from the top of each building.

• Traverse the sequence of buildings from left to right and maintain a stack of visible buildings.

• For each building, pop all the buildings from the stack that are shorter than the current building and count them as visible to the left.

• Push the current building onto the stack and count the number of buildings in the stack as visible to the right.

• Repeat the proc...read more

Sensitive user data in React Native can be stored securely using AsyncStorage or secure storage libraries.

• Use AsyncStorage to store sensitive data locally on the device.

• Utilize secure storage libraries like react-native-keychain or react-native-secure-storage for encryption and secure storage.

• Avoid storing sensitive data in plain text or insecure locations.

• Implement proper authentication and authorization mechanisms to control access to sensitive data.

Custom hooks in React Native allow for reusable logic across components.

• Custom hooks are functions that start with 'use' keyword.

• They can encapsulate logic like API calls, state management, etc.

• Example: useFetch custom hook for making API calls.

Test cases for payment scenario

• Verify payment is processed successfully with valid credit card information

• Test payment failure with invalid credit card details

• Check if payment confirmation email is sent to the user

• Test payment timeout scenario

• Verify payment receipt is generated after successful transaction

I will manage merchant expectations by setting clear communication, understanding their needs, and delivering on promises.

• Establish clear communication channels with merchants to understand their expectations

• Set realistic expectations and deliver on promises to build trust

• Regularly follow up with merchants to ensure their needs are being met

• Provide updates on progress and address any concerns promptly

• Offer solutions or alternatives if expectations cannot be met

Tokenization is the process of replacing sensitive data with unique identification symbols that retain all the essential information without compromising security.

• Tokenization helps protect sensitive information such as credit card numbers by replacing them with tokens.

• Tokens are randomly generated and cannot be reverse-engineered to obtain the original data.

• Tokenization is commonly used in payment processing and data security systems.

• Example: When you make a purchase online,...read more

3ds2.0 is a security protocol used for online transactions to authenticate the cardholder's identity.

• It stands for 3-D Secure 2.0

• It provides an additional layer of security for online payments

• It includes features such as biometric authentication and risk-based authentication

• Examples include Visa Secure and Mastercard Identity Check

React Native's new architecture is based on Fabric, a re-architecture of the core of React Native.

• Fabric is a new threading model that improves performance by allowing React Native to schedule work on multiple threads.

• It separates the UI rendering from JavaScript execution, resulting in smoother animations and improved responsiveness.

• The new architecture also introduces TurboModules, which are a more efficient way to communicate between JavaScript and native code.

• The goal of ...read more

Convert Arabic numbers to Roman numerals

• Create a mapping of Arabic numbers to Roman numerals

• Iterate through the mapping to find the largest Roman numeral that fits the Arabic number

• Subtract the value of the Roman numeral from the Arabic number and repeat until the Arabic number becomes 0

Rate limiting algorithm is used to control the rate of traffic sent or received by a system.

• Rate limiting helps prevent abuse, protect against DoS attacks, and ensure fair usage of resources.

• Common rate limiting algorithms include token bucket, leaky bucket, and fixed window.

• Token bucket algorithm adds tokens at a fixed rate and consumes tokens for each request.

• Leaky bucket algorithm leaks tokens at a fixed rate and allows bursts up to a certain limit.

• Fixed window algorithm l...read more