Otto Interview Questions and Answers

Use bitwise operations to find the sum of two numbers without using mathematical operators.

• Use bitwise XOR to find the sum of two numbers without carrying.

• Use bitwise AND and left shift to find the carry.

• Repeat the process until there is no carry left.

To delete a node from a linked list when only given a reference to the node, we can copy the data of the next node to the given node and delete the next node.

• Copy the data of the next node to the given node

• Update the next pointer of the given node to skip the next node

• Delete the next node

The question asks to fill the blanks in a pyramid where each number is the sum of the numbers in the bottom two cells.

• Start from the bottom row and work your way up, calculating the sum of the numbers in the bottom two cells for each blank space.

• Use a loop to iterate through each row and column of the pyramid.

• Store the calculated sum in the corresponding blank space.

• Repeat the process until all the blanks are filled.

Moore's Law is the observation that the number of transistors in a dense integrated circuit doubles about every two years.

• Named after Intel co-founder Gordon Moore

• First stated in 1965

• Has been a driving force behind technological advancements

• Predicts exponential growth in computing power

• Has been challenged in recent years due to physical limitations

A process is an instance of a program while a thread is a subset of a process.

• A process has its own memory space while threads share memory space

• Processes are heavyweight while threads are lightweight

• Processes communicate through inter-process communication while threads communicate through shared memory

• Examples of processes include web browsers, text editors, etc. while examples of threads include GUI updates, backgro

Multi-core processors provide faster and more efficient computing.

• Improved performance and speed

• Ability to handle multiple tasks simultaneously

• Reduced power consumption

• Better multitasking capabilities

• Enhanced user experience

• Examples: Intel Core i7, AMD Ryzen 9

I am a software engineer with a loving family.

• I have been working as a software engineer for 5 years.

• My wife is a teacher and we have two children.

• We enjoy spending time together outdoors and traveling.

• My parents live in a different state but we keep in touch regularly.

• Family is very important to me and I prioritize spending time with them.

Developed a web-based project management tool and a mobile app for tracking expenses

• Created a responsive UI using React and Bootstrap

• Implemented user authentication and authorization using Firebase

• Integrated Google Maps API for location tracking in the mobile app

• Used Node.js and MongoDB for backend development

• Collaborated with a team of four to complete the projects

I have 5 years of experience in software engineering with expertise in Java and Python.

• Developed and maintained web applications using Java and Spring framework

• Designed and implemented RESTful APIs using Python and Flask

• Worked on database management and optimization using MySQL and MongoDB

• Collaborated with cross-functional teams to deliver high-quality software products

• Participated in code reviews and provided construc

My academic interests include computer science, artificial intelligence, and machine learning.

• Computer science

• Artificial intelligence

• Machine learning

Explain Big O notation

• Big O notation is used to describe the time complexity of an algorithm

• It helps us understand how the algorithm's performance changes with input size

• O(1) means constant time, O(n) means linear time, O(n^2) means quadratic time

• We want algorithms with lower Big O values for better performance

I am open to relocation based on the job opportunity and growth prospects.

• Open to relocation for the right opportunity

• Willing to move for career growth

• Flexible with location based on job requirements

Yes, I would love to have a pizza slice!

• I am a big fan of pizza and would never say no to a slice!

• Pizza is the perfect food for any occasion, whether it's a quick lunch or a late-night snack.

• I particularly enjoy pepperoni and mushroom pizza, but I'm open to trying new toppings as well.

I am a software developer with experience in multiple programming languages and a passion for problem-solving.

• Experienced in Java, C++, and Python

• Strong knowledge of data structures and algorithms

• Proficient in web development using HTML, CSS, and JavaScript

• Familiar with agile development methodologies

• Excellent problem-solving and analytical skills

Automation framework is a set of guidelines, standards, and coding practices used to create automated test scripts.

• It provides a structured way to develop and maintain automated tests

• It includes tools, libraries, and reusable components

• It helps in reducing the time and effort required for testing

• Examples include Selenium, Appium, and Robot Framework

High severity refers to critical defects that impact the core functionality of the software, while low severity refers to minor issues that have minimal impact on functionality.

• High severity issues can cause the software to crash or result in data loss.

• Low severity issues are cosmetic or minor usability problems.

• From a QA point of view, high severity issues are more critical as they can significantly impact the user ex...read more

Class is a blueprint for creating objects while interface defines a contract for classes to implement.

• A class can have attributes and methods while an interface only has method signatures.

• A class can be instantiated while an interface cannot.

• A class can only inherit from one class while it can implement multiple interfaces.

• Example: Class - Animal, Interface - Flyable

• Animal can have attributes like name, age, etc. and m...read more

Static keyword is used to declare a variable or method that belongs to the class rather than an instance of the class.

• Static variables are shared among all instances of a class

• Static methods can be called without creating an instance of the class

• Static blocks are used to initialize static variables

• Static keyword can also be used to create nested classes

• Example: public static int count;

Access modifiers control the visibility and accessibility of class members.

• Public: accessible from anywhere

• Private: accessible only within the class

• Protected: accessible within the class and its subclasses

• Default: accessible within the same package

• Used to enforce encapsulation and prevent unauthorized access

Interface defines only method signatures while abstract class can have both method signatures and implementations.

• An interface can be implemented by multiple classes while an abstract class can only be extended by one class.

• An abstract class can have constructors while an interface cannot.

• An abstract class can have instance variables while an interface cannot.

• An abstract class can provide default implementations for so...read more

A program for login scenario using defined automation architecture.

• Identify the elements on the login page such as username, password, and login button

• Use automation tools like Selenium to interact with the elements and input data

• Verify successful login by checking for expected elements on the landing page

• Implement error handling for incorrect login credentials

• Use a modular and scalable architecture for maintainability

To store and print numbers from an array using arrayList.

• Create an arrayList object

• Loop through the array and add each element to the arrayList using add() method

• Print the arrayList using toString() method

• Example: int[] arr = {1, 2, 3}; ArrayList list = new ArrayList<>(); for(int num : arr) { list.add(num); } System.out.println(list.toString());

Test scenario for download functionality of a songs website

• Verify that the download button is visible and clickable

• Check that the downloaded file is in the correct format

• Ensure that the downloaded file is not corrupted

• Test the download speed for different file sizes

• Verify that the download progress is displayed to the user

Cache stores data temporarily to reduce server load while cookies store user information for website personalization.

• Cache stores frequently accessed data to reduce server load and improve website performance.

• Cookies store user information such as login credentials, preferences, and shopping cart items.

• Cache is temporary and can be cleared at any time, while cookies can have an expiration date.

• Cache is stored on the us...read more