OpenText Technologies Interview Questions, Process, and Tips

Q1. Write a program in .NET that outputs the characters appearing more than two times consecutively in a given string.
Ans. 
Program in .NET to output characters appearing more than two times consecutively in a given string.
• Iterate through the string and check if the current character is the same as the previous one.

• Keep track of the count of consecutive characters and output those that appear more than two times.

• Use a StringBuilder to efficiently build the output string.
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Q2. If there are five microservices, labeled as microservice one, microservice two, microservice three, microservice four, and microservice five. Microservice three breaks. Requests from microservice two to ...read more
Ans. 
Implement strategies to resolve backlog of requests from microservice two due to microservice three breaking.
• Identify the root cause of the issue in microservice three and fix it.

• Implement circuit breaker pattern to handle failures and prevent cascading failures.

• Implement retries with exponential backoff for failed requests from microservice two to microservice three.

• Scale up microservice three to handle increased load...read more
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Q3. What is an abstract class, and why is it necessary to use an abstract class when interfaces already exist?
Ans. 
Abstract class is a class that cannot be instantiated and may contain abstract methods, while interfaces only define method signatures.
• Abstract classes can have both abstract and non-abstract methods, providing a partial implementation for subclasses.

• Interfaces can only have method signatures, requiring implementing classes to define the actual implementation.

• Abstract classes can have constructors, member variables, an...read more
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Q4. What design patterns have you utilized in your projects?
Ans. 
I have utilized design patterns such as Singleton, Factory, and Observer in my projects.
• Singleton pattern for ensuring a class has only one instance

• Factory pattern for creating objects without specifying the exact class

• Observer pattern for defining a one-to-many dependency between objects
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Q5. Can you illustrate the architecture of your application?
Ans. 
The application architecture follows a microservices design pattern with a front-end client communicating with multiple back-end services.
• Front-end client communicates with back-end services via APIs

• Back-end services are independent and handle specific functionalities

• Data is stored in a distributed database for scalability

• Use of containerization for deployment and scaling

• Message queues for asynchronous communication be
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Q1. Given a list of strings that may contain duplicates, return a list of the duplicate strings using the most efficient approach.
Ans. 
Use a hash set to efficiently find duplicate strings in a list.
• Create a hash set to store unique strings.

• Iterate through the list of strings, adding each string to the hash set.

• If a string is already in the hash set, add it to the list of duplicates.

• Return the list of duplicate strings.
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Q2. Could you explain what your application does and the types of technology it utilizes?
Ans. 
Our application is a cloud-based project management tool that helps teams collaborate and track progress.
• Utilizes React for front-end development

• Uses Node.js for back-end development

• Integrates with third-party APIs for additional functionality
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Q3. When should we use MS SQL and NoSQL databases?
Ans. 
MS SQL for structured data, NoSQL for unstructured data or high scalability
• Use MS SQL for structured data with complex relationships and transactions

• Use NoSQL for unstructured data or high scalability requirements

• Consider using a combination of both for different parts of the application

• Example: Use MS SQL for financial transactions and NoSQL for user profiles
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Q4. Which NoSQL database would you choose as an alternative to Elasticsearch, and what are your reasons for that choice?
Ans. 
MongoDB is a popular choice as an alternative to Elasticsearch due to its flexibility and scalability.
• MongoDB is a document-oriented NoSQL database that allows for flexible schema design, making it a good fit for a wide range of use cases.

• MongoDB also offers powerful indexing and querying capabilities, similar to Elasticsearch.

• MongoDB's horizontal scalability and sharding capabilities make it suitable for handling larg...read more
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Q5. What are the differences between MongoDB and PostgreSQL?
Ans. 
MongoDB is a NoSQL database while PostgreSQL is a relational database management system.
• MongoDB is schema-less, allowing for flexible data models, while PostgreSQL enforces a predefined schema.

• MongoDB uses a document-based data model with JSON-like documents, while PostgreSQL uses tables with rows and columns.

• MongoDB is better suited for applications with large amounts of unstructured data, while PostgreSQL is better f...read more
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Q6. What are the differences between conventional URLs and attribute URLs in .NET Core Web API?
Ans. 
Conventional URLs use query parameters while attribute URLs use route parameters in .NET Core Web API.
• Conventional URLs use query parameters to pass data in the URL, while attribute URLs use route parameters in the route template.

• Conventional URLs are more flexible as they allow for optional parameters, while attribute URLs are more rigid in their structure.

• Attribute URLs are more readable and provide a cleaner way to ...read more
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Q7. What is the working mechanism of OAuth authorization?
Ans. 
OAuth authorization is a protocol that allows a user to grant limited access to their resources without sharing their credentials.
• OAuth allows a user to grant access to their resources to a third-party application without sharing their credentials.

• It involves the exchange of tokens between the user, the third-party application, and the resource server.

• OAuth uses authorization codes, access tokens, and refresh tokens to...read more
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Q8. What steps do you take to ensure that an application remains maintainable?
Ans. 
To ensure maintainability, I follow coding best practices, use version control, write clean and modular code, document thoroughly, and conduct regular code reviews.
• Follow coding best practices such as SOLID principles and design patterns

• Use version control system like Git to track changes and collaborate with team members

• Write clean and modular code to make it easier to understand and update

• Thoroughly document code, in...read more
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Q9. Which design patterns have you utilized in your work?
Ans. 
I have utilized design patterns such as Singleton, Factory, and Observer in my work.
• Singleton pattern for ensuring a class has only one instance

• Factory pattern for creating objects without specifying the exact class

• Observer pattern for defining a one-to-many dependency between objects
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Q10. How does Repository Pattern help in maintaining your codebase
Ans. 
Repository Pattern helps in separating data access logic from business logic, improving code maintainability.
• Encapsulates the logic required to access data from the data source, providing a clean separation between data access and business logic.

• Promotes code reusability by allowing different parts of the application to use the same data access logic without duplicating code.

• Facilitates unit testing by enabling the moc...read more
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Two questions to solved (difficulty was easy to medium)
1) Based bit manipulaqtion
2) Based on recussion

Q1. Asked to solved a string problem
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Q2. Questions based on oops
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Q3. Questions based on excepton hadling
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Q4. Self introduction
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Q5. About projects in resume
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Q6. Would you be willing to work in banglore?
Ans. 
Yes, I am willing to work in Bangalore.
• I am open to relocating for the right opportunity.

• I have heard great things about the tech industry in Bangalore.

• I am excited about the prospect of working in a diverse and vibrant city like Bangalore.
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Basic DSA from the hacker rank website

Q1. Basic to medium questions on javascript, nodejs, MySQL joints, html5 tags
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Q1. Real life problems, Use cases
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