Angel One Android Developer Interview Questions and Answers

I am a passionate software developer with experience in Java, Python, and web development.

• Experienced in Java, Python, and web development technologies

• Strong problem-solving skills

• Team player with excellent communication skills

My resume highlights my experience in software development and showcases my skills in various programming languages and technologies.

• Worked on multiple projects using Java, Python, and C++

• Developed web applications using HTML, CSS, and JavaScript

• Experience with databases such as MySQL and MongoDB

• Familiarity with Agile methodology and version control systems like Git

• Participated in hackathons and coding competitions

I want to go for VISA to explore new opportunities and gain international experience.

• To gain exposure to different cultures and work environments

• To expand my skill set and learn new technologies

• To work on challenging projects and contribute to the growth of the company

• To build a global network of professionals and enhance my career prospects

A binary tree is a data structure in which each node has at most two children.

• Start with a root node

• Each node has a left and right child

• Nodes can be added or removed

• Traversal can be done in-order, pre-order, or post-order

Code a basic linked list

• Create a Node class with data and next pointer

• Create a LinkedList class with head pointer

• Implement methods to add, delete, and search nodes in the linked list

A circular linked list is a data structure where the last node points back to the first node, forming a loop.

• Create a Node class with data and next pointer

• Initialize the head node and set its next pointer to itself

• To add a node, create a new node and set its next pointer to the head node's next pointer, then update the head node's next pointer to the new node

• To traverse the circular linked list, start from the head nod...read more

Developed a web application using Python and Django framework for managing inventory and sales.

• Used Python programming language for backend development

• Implemented Django framework for building web application

• Designed database schema for inventory and sales data

• Integrated frontend using HTML, CSS, and JavaScript

• Implemented user authentication and authorization features

Race condition is a situation where multiple threads/processes access and manipulate shared data simultaneously.

• It can be eliminated by using synchronization techniques like locks, semaphores, and mutexes.

• Another way is to use atomic operations that ensure the data is accessed and modified atomically.

• Using thread-safe data structures can also prevent race conditions.

• Example: Two threads trying to increment a shared var...read more

JCube is a Java library for creating and manipulating Rubik's Cube puzzles.

• JCube provides classes for representing Rubik's Cube puzzles and algorithms for solving them.

• It supports various cube sizes and can generate random scrambles.

• JCube can be used in Java applications or as a standalone command-line tool.

• It is open source and available on GitHub.

Regression testing is the process of testing changes made to a software application to ensure that existing functionality still works.

• It is performed after making changes to the software

• It ensures that existing functionality is not affected by the changes

• It helps to catch any defects or bugs that may have been introduced

• It can be automated using testing tools

• Examples include retesting after bug fixes, testing after new

Software engineering principles are the best practices and guidelines for developing high-quality software.

• Software should be designed with modularity and scalability in mind.

• Code should be well-documented and easy to read.

• Testing and debugging should be an integral part of the development process.

• Version control should be used to manage code changes.

• Security and privacy should be considered throughout the development

A Singleton class is a class that can only have one instance at a time.

• It restricts the instantiation of a class to a single object.

• It provides a global point of access to that instance.

• It is often used in situations where a single object is required to coordinate actions across a system.

• Example: Database connection manager, Configuration manager, Logger manager.

Testing principles ensure software quality, while design principles guide software development.

• Testing principles include unit testing, integration testing, and acceptance testing.

• Design principles include SOLID, DRY, and KISS.

• Testing principles ensure that software meets requirements and is free of defects.

• Design principles guide software development to be modular, maintainable, and scalable.

I have the necessary skills, experience, and passion to contribute to VISA's success.

• I have a strong background in software development and have worked on projects similar to those at VISA.

• I am a quick learner and can adapt to new technologies and programming languages easily.

• I am passionate about creating high-quality software that meets the needs of users and exceeds their expectations.

• I am a team player and can work...read more

A profile that challenges me to learn and grow while allowing me to contribute to a team.

• A position that encourages continuous learning and development

• A role that allows me to collaborate with a team and contribute to projects

• A company culture that aligns with my values and work ethic

I am interested in exploring new opportunities and challenges that this company can offer.

• I am impressed with the company's reputation and growth potential.

• I am excited about the projects and technologies this company is working on.

• I believe this company can provide me with a better work-life balance and career growth opportunities.

• I am looking for a company culture that aligns with my values and goals.

• I am open to exp...read more

Find the odd repeating element from an array of strings

• Use a hash table to count the frequency of each element

• Iterate through the hash table to find the element with an odd count

Finding an element in a sorted 2D matrix

• Start from the top right corner or bottom left corner

• Compare the target element with the current element

• Move left or down if the target is smaller, else move right or up

• Repeat until the target is found or all elements are checked

SQL query to find Nth highest salary from table

• Use ORDER BY and LIMIT clauses

• Use subquery to get the Nth highest salary

• Handle cases where there are less than N distinct salaries

Function to swap '3' and '4' without using if-else

• Use XOR operator to swap the values

• Convert the input to ASCII code and perform the swap

• Use a lookup table to map the values

I am a software developer with experience in Java and Python.

• Proficient in Java and Python programming languages

• Experience in developing web applications using Spring framework

• Familiarity with database management systems like MySQL and MongoDB

PAYTM is a leading digital payment platform in India with a wide range of services.

• PAYTM has a user-friendly interface and offers a seamless payment experience.

• It provides a variety of services like mobile recharges, bill payments, and online shopping.

• PAYTM has a strong focus on security and fraud prevention measures.

• It has a large user base and is widely accepted by merchants across India.

• PAYTM is constantly innovatin...read more

Yes, I am open to pursuing further studies in the future.

• I believe in continuous learning and staying updated with the latest technologies.

• Further studies can help me specialize in a particular field and enhance my skills.

• I may consider pursuing a master's degree in computer science or a related field.

• However, my immediate focus is on gaining practical experience and contributing to the organization.

PAYTM grew fast due to its innovative approach and early adoption of digital payments.

• Early adoption of digital payments in India

• Innovative approach with features like mobile recharges, bill payments, and cashback offers

• Expansion into e-commerce and financial services

• Strategic partnerships with major companies like Uber and Alibaba