30+ Interview Questions and Answers

Listen to their concerns, empathize, offer solutions and follow up regularly.

• Acknowledge their frustration and apologize for any inconvenience caused.

• Listen actively to their concerns and ask questions to understand the root cause of their dissatisfaction.

• Offer solutions to address their concerns and provide a timeline for implementation.

• Follow up regularly to ensure that the client is satisfied with the progress and address any new concerns that may arise.

• Maintain open and t...read more

I will assess the market for upcoming Online payments product by conducting market research and analyzing customer needs and preferences.

• Conduct market research to identify the target audience and their needs

• Analyze the competition and their offerings

• Identify the gaps in the market and potential opportunities

• Gather feedback from potential customers through surveys and focus groups

• Consider factors such as security, ease of use, and convenience

• Evaluate the regulatory environmen...read more

POS stands for Point of Sale. It refers to the system used to complete sales transactions in retail or hospitality businesses.

• POS is a computerized system that includes hardware (such as a cash register or barcode scanner) and software (to process transactions and manage inventory).

• It is used to facilitate the exchange of goods or services for payment.

• POS systems can track sales, manage inventory, generate reports, and process various payment methods.

• They are commonly used in...read more

Methods used to find the valuation of a company include comparable company analysis, precedent transactions, discounted cash flow analysis, and asset-based valuation.

• Comparable Company Analysis: Compares the target company to similar publicly traded companies to determine its value.

• Precedent Transactions: Examines the prices paid for similar companies in the past to estimate the target company's value.

• Discounted Cash Flow Analysis: Estimates the present value of a company's f...read more

CLP and SCLP cards are used for different levels of access to classified information.

• CLP stands for Confidential Level of Protection and is used for access to confidential information.

• SCLP stands for Secret Confidential Level of Protection and is used for access to secret and confidential information.

• SCLP cards have additional security measures and require a higher level of clearance than CLP cards.

• Both cards are used by government agencies and contractors who handle classifi...read more

Print left view of binary tree

• Traverse the binary tree level by level

• Print the first node at each level encountered

I prefer arrays for their fixed size and faster access, but lists for their flexibility and ease of manipulation.

• Arrays are preferred for their fixed size and faster access time, especially when random access is required.

• Lists are more flexible and easier to manipulate, especially when elements need to be added or removed frequently.

• Arrays are typically used when the size of the collection is known beforehand, while lists are used when the size may vary.

• Example: In a scenario...read more

Credit card payment involves multiple systems like POS terminals, payment gateways, and card networks.

• Point of Sale (POS) terminals are used to swipe or insert the credit card for payment.

• Payment gateways securely transmit payment information between the merchant and the bank.

• Card networks like Visa, Mastercard, and American Express process the transaction and transfer funds between parties.

Fintech industry has seen recent developments in digital payments, blockchain technology, and AI-driven financial services.

• Digital payments have become more popular and convenient, with the rise of mobile wallets like Apple Pay and Google Pay.

• Blockchain technology has gained traction in the financial sector, enabling secure and transparent transactions.

• Artificial intelligence is being used to provide personalized financial services, such as robo-advisors and chatbots.

• Open ban...read more

REST API is a type of web service that allows communication between different systems over HTTP.

• REST API stands for Representational State Transfer Application Programming Interface.

• It uses standard HTTP methods like GET, POST, PUT, DELETE for communication.

• Error codes in REST API include 4xx for client errors (e.g. 404 for not found) and 5xx for server errors (e.g. 500 for internal server error).

The weather today is sunny with a few clouds and a high of 75 degrees.

• Sunny weather with some clouds

• High temperature of 75 degrees

• Possibility of rain later in the day

I value continuous learning, collaboration, innovation, and integrity in my work as a software developer.

• Continuous learning: I believe in staying updated with the latest technologies and trends in the industry.

• Collaboration: I value working in a team and sharing knowledge and ideas with my colleagues.

• Innovation: I strive to find creative solutions to problems and improve processes.

• Integrity: I believe in honesty, transparency, and ethical behavior in all aspects of my work.

Pine Labs is a leading merchant platform company that provides payment and loyalty solutions to merchants.

• Pine Labs offers a range of payment solutions such as POS machines, online payments, and mobile payments.

• It also provides loyalty and gift card solutions to merchants.

• Pine Labs has a presence in multiple countries including India, UAE, and Malaysia.

• Some of its notable clients include McDonald's, KFC, and Samsung.

Swap words in strings

• Split the string into words

• Swap the words using a temporary variable

• Join the words back into a string

MDR of EDC.in Paytm is the Merchant Discount Rate charged by Paytm for transactions made through their Electronic Data Capture (EDC) system.

• MDR is a fee charged by Paytm to merchants for accepting payments through their EDC system

• It is a percentage of the transaction amount and varies based on the type of transaction and merchant category

• MDR covers the costs associated with payment processing, infrastructure, and other services provided by Paytm

• For example, if the MDR is 2% a...read more

APIs allow communication between different software applications by defining a set of rules for data exchange.

• APIs provide a standardized way for applications to interact with each other

• APIs typically use HTTP requests to send and receive data

• APIs can be RESTful, SOAP-based, or use other protocols

• APIs often require authentication and may have rate limits

• API documentation is important for developers to understand how to use the API

Security concepts include encryption, authentication, access control, and network security. Linux commands involve file management, user administration, and networking.

• Security concepts: encryption, authentication, access control, network security

• Linux commands: file management, user administration, networking

• Security examples: AES encryption, two-factor authentication, firewall rules

• Linux examples: ls, chmod, ifconfig

In my previous job, I dealt with a diverse range of clients including individuals, small businesses, and large corporations.

• Individual clients seeking personal financial advice

• Small businesses looking for investment opportunities

• Large corporations requiring financial planning and risk management services

Find k closest elements in an array

• Sort the array based on the absolute difference between each element and the target element

• Return the first k elements from the sorted array

EDC Machine is an electronic device used for processing card payments.

• EDC stands for Electronic Data Capture.

• It is commonly used in retail stores, restaurants, and other businesses to accept credit and debit card payments.

• The machine reads the information from the card's magnetic stripe or chip and securely transmits it for authorization.

• It can also print receipts for customers.

• EDC machines are connected to a payment network or a bank for transaction processing.

• They provide c...read more

Implement code for order placement

• Create a class or function to handle order placement

• Include parameters for customer information, product details, and payment information

• Implement validation checks for input data before processing the order

• Generate a unique order ID for each order placed

• Update inventory levels and customer records after successful order placement

OOP stands for Object-Oriented Programming, a programming paradigm based on the concept of objects.

• OOP focuses on creating objects that contain data and methods to manipulate that data.

• Encapsulation is a key concept in OOP, where data is hidden within objects and can only be accessed through methods.

• Inheritance allows objects to inherit attributes and methods from parent classes.

• Polymorphism allows objects to be treated as instances of their parent class, enabling flexibility...read more

MVVM is a design pattern that separates the UI logic from the business logic in an application.

• Model: Represents the data and business logic of the application

• View: Represents the UI components of the application

• ViewModel: Acts as a mediator between the Model and View, handling the UI logic and data binding

• Encourages separation of concerns and easier unit testing

Dependency injection is a design pattern where components are provided with their dependencies rather than creating them internally.

• In dependency injection, the dependencies of a component are injected from the outside.

• This helps in making components more modular, testable, and reusable.

• There are three types of dependency injection - constructor injection, setter injection, and interface injection.

REST API is a standard way of building web services, while Kafka is a distributed streaming platform for handling real-time data feeds.

• REST API is used for building web services that follow the REST architectural style

• Kafka is used for handling real-time data feeds and building real-time data pipelines

• REST API is synchronous, while Kafka is asynchronous and can handle high throughput and low latency data streams

Design a marketplace system for buying and selling goods and services.

• Create user accounts for buyers and sellers

• Implement search and filter functionality for easy browsing

• Include secure payment processing system

• Allow users to leave reviews and ratings for products/services

• Provide customer support and dispute resolution

• Consider scalability and performance for handling large volumes of transactions

Transactions in Spring framework help manage database transactions in a consistent and reliable manner.

• Spring provides support for declarative transaction management using @Transactional annotation

• Transactions can be managed programmatically using TransactionTemplate

• Spring supports both programmatic and declarative transaction management

• Transactions ensure ACID properties (Atomicity, Consistency, Isolation, Durability)

CTC stands for Cost to Company, which includes all expenses related to an employee's salary.

• CTC includes salary, bonuses, benefits, and any other perks provided by the company.

• It is the total amount of money a company spends on an employee in a year.

• CTC is different from take-home salary as it includes all expenses incurred by the company for the employee.

• Employers often use CTC to attract and retain talent by offering competitive compensation packages.

SQL query to retrieve all employees from a specific department

• Use SELECT statement to retrieve data

• Specify the columns to be retrieved

• Use WHERE clause to filter by department