100+ Software Engineer III Interview Questions and Answers

Implement a basic data grid component using machine coding

• Start by defining the structure of the data grid component

• Implement functions for adding, updating, and deleting data in the grid

• Include features like sorting, filtering, and pagination

• Consider performance optimizations for handling large datasets

• Test the data grid component with sample data to ensure functionality

Memoization is a technique used in programming to store the results of expensive function calls and return the cached result when the same inputs occur again.

• Memoization helps improve the performance of a function by caching its results.

• It is commonly used in dynamic programming to optimize recursive algorithms.

• Example: Memoizing a Fibonacci function to avoid redundant calculations.

Implement polyfill of promise.all and debounce function with example

• Create a polyfill for Promise.all by using Promise constructor and Promise.resolve

• Implement debounce function by using setTimeout and clearTimeout

• Example: const debouncedFunction = debounce(() => { console.log('debounced function called') }, 300)

Program to calculate diagonal and anti-diagonal sum of a matrix.

• Iterate through the matrix to calculate diagonal and anti-diagonal sums separately.

• For diagonal sum, add elements where row index equals column index.

• For anti-diagonal sum, add elements where row index + column index equals matrix size - 1.

• Example: For a 3x3 matrix, diagonal sum = matrix[0][0] + matrix[1][1] + matrix[2][2]

• Example: For a 3x3 matrix, anti-diagonal sum = matrix[0][2] + matrix[1][1] + matrix[2][0]

JVM is an abstract computing machine that enables a computer to run Java programs.

• JVM is platform-independent and converts Java bytecode into machine code.

• It consists of class loader, runtime data areas, execution engine, and native method interface.

• JVM manages memory, garbage collection, and exception handling.

• Examples of JVM implementations include Oracle HotSpot, OpenJ9, and GraalVM.

Hoisting, closures, and the event loop are key JavaScript concepts; custom middleware enhances Node.js applications.

• Hoisting: JavaScript's behavior of moving variable and function declarations to the top of their containing scope.

• Example of Hoisting: 'console.log(x); var x = 5;' outputs 'undefined' because 'x' is hoisted.

• Closures: Functions that remember their lexical scope even when the function is executed outside that scope.

• Example of Closure: 'function outer() { let x = 1...read more

Call, bind, and apply are methods in JavaScript used to manipulate the context of a function.

• Call method is used to call a function with a specified 'this' value and arguments provided individually.

• Bind method is used to create a new function that, when called, has a specified 'this' value and arguments provided upfront.

• Apply method is similar to call method, but arguments are passed as an array.

Math.floor() is a method in JavaScript that rounds a number down to the nearest integer.

• Math.floor() returns the largest integer less than or equal to a given number.

• It is commonly used to convert a floating-point number to an integer.

• Example: Math.floor(3.9) returns 3.

Use two threads to print numbers 1 to 10, with Thread A printing odd numbers and Thread B printing even numbers.

• Create two threads, one for odd numbers and one for even numbers

• Use a shared variable to keep track of the current number being printed

• Use synchronization mechanisms like mutex or semaphore to ensure proper sequencing of numbers

Kafka is a distributed streaming platform used for building real-time data pipelines and streaming applications.

• Kafka is designed to handle high-throughput, fault-tolerant, and scalable real-time data streams.

• It allows for the publishing and subscribing to streams of records, similar to a message queue.

• Kafka is often used for log aggregation, stream processing, event sourcing, and real-time analytics.

• It provides durability and fault tolerance through replication of data acros...read more

A Promise is an object representing the eventual completion or failure of an asynchronous operation.

• A Promise is used to handle asynchronous operations in JavaScript.

• It represents a value that may be available now, or in the future.

• A polyfill for Promise can be implemented using the setTimeout function to simulate asynchronous behavior.

The interviewee was asked about word break, string to integer, and system design for an e-commerce app.

• Word break: Given a string and a dictionary of words, determine if the string can be segmented into a space-separated sequence of dictionary words.

• String to integer: Convert a string to an integer. Handle negative numbers and invalid inputs.

• System design e-commerce app: Design an e-commerce app with features like product listing, search, cart, checkout, payment, and order tr...read more

The detailed process of searching for google.com involves DNS resolution, HTTP request, server response, and rendering the webpage.

• 1. User enters 'google.com' in the browser address bar.

• 2. Browser checks cache for DNS resolution, if not found, sends a DNS query to resolve the domain name to an IP address.

• 3. Browser sends an HTTP request to the resolved IP address for google.com.

• 4. Google's server processes the request, retrieves the webpage content, and sends it back in an HT...read more

Reverse a linked list

• Iterate through the linked list and change the direction of the pointers

• Use three pointers to keep track of the previous, current, and next nodes

• Recursively reverse the linked list

Handling API deprecation involves planning, communication, and providing alternatives to ensure smooth transitions for users.

• Communicate early: Notify users about the deprecation well in advance, providing a timeline for when the API will be retired.

• Provide alternatives: Suggest newer APIs or methods that users can adopt instead of the deprecated API.

• Maintain documentation: Update documentation to reflect the deprecation and guide users on migration paths.

• Versioning: Use vers...read more

Data Annotations are attributes used in .NET Framework to provide metadata about data elements.

• Data Annotations are used to validate data in models.

• They can be used to specify data types, display names, and format strings.

• Examples include [Required], [StringLength], and [RegularExpression].

I chose HashedIn for its innovative projects and collaborative work culture.

• Innovative projects attracted me to HashedIn

• I value the collaborative work culture at HashedIn

• I appreciate the opportunities for growth and learning at HashedIn

• I was impressed by the team's technical expertise during the interview process

Find index of second smallest and second largest element in an array of strings

• Convert the array of strings to an array of integers for comparison

• Sort the array to easily find the second smallest and second largest elements

• Track the indices of the elements as you iterate through the sorted array

Convert a number into words

• Create an array of strings to represent numbers from 0 to 19

• Use conditional statements to handle numbers from 20 to 99

• Consider special cases like multiples of 10 and teens

Static, final, and abstract are keywords in Java used for different purposes.

• Static is used to create variables and methods that belong to the class rather than an instance of the class.

• Final is used to declare constants or to prevent a class, method, or variable from being overridden or modified.

• Abstract is used to create abstract classes and methods that cannot be instantiated and must be implemented by subclasses.

Program in C# demonstrating OOPs concepts

• Use classes and objects to demonstrate encapsulation

• Inheritance can be shown by creating a base class and derived classes

• Polymorphism can be illustrated through method overriding or interfaces

• Abstraction can be implemented by hiding internal details and showing only necessary information

JavaScript is a popular programming language used for web development. ES6 modules are a way to organize and reuse code in JavaScript.

• JavaScript is a high-level, interpreted programming language commonly used for client-side web development.

• ES6 modules allow developers to split their code into separate files and import/export functions, variables, and classes between them.

• ES6 introduced 'import' and 'export' keywords for module management.

• Example: 'export function myFunction(...read more

Apache Kafka is a distributed streaming platform that is used for building real-time data pipelines and streaming applications.

• Apache Kafka uses a publish-subscribe messaging system where producers publish messages to topics and consumers subscribe to those topics to receive messages.

• It stores messages in topics for a configurable retention period, allowing consumers to access historical data.

• Kafka brokers form a cluster to manage topics and partitions, ensuring fault toleran...read more

To tune a Stored Procedure, identify bottlenecks, optimize queries, and use indexes.

• Identify slow queries and optimize them

• Use indexes to improve query performance

• Avoid using cursors and temporary tables

• Minimize network traffic by reducing data returned

• Use SET NOCOUNT ON to reduce network traffic

• Use stored procedure parameters instead of constants or variables

• Use TRY/CATCH blocks to handle errors

• Monitor performance using SQL Server Profiler and Database Engine Tuning Advisor