Keane Technical Lead Interview Questions and Answers

Q1. All questions related to the technologies used in banking system
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Q1. All questions related to technologies used in finance sector enterprise app or banking application
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Q1. About your salary expectation and joining formalities
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Q1. Fake Interview, Didn't expect this from virtusa
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Q2. FakeInterviews conducted, Didn;t expect this from virtusa
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Q3. Virtusa Scammers
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Q1. Explain node vs java
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Q2. Explain 1nf 2nf 3nf
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Q3. Explain asynchronus
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Q4. Explain graphql
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Q5. Explain ?? in javascript
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Q1. Questions about Interfaces,, Abstract Classes, Multi-Threading, Parallel Programming concepts, SQL Server
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Q1. Questions about Design Patterns, SOLID Principles, Extension Methods, LINQ, Entity Framework
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Q1. Questions about current project and my roles and responsibilities, my salary structure, my aspirations whether I want to be Architect or just Team Lead.
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Q1. My CTC and ECTC, and asked for negotiation, to which I said yes and accepted the compensation they can offer to me. But still offer letter not released without giving any reason.
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Q1. Java Collections
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Q2. Java8 Stream program
Ans. 
Java8 Stream program to filter even numbers and double them
• Use Stream to filter even numbers

• Use map to double the filtered numbers

• Use collect to collect the results into a list
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Q1. Completable future
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Q2. Microservice architecture
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Simple array questions

Q1. Difference between spring jpa and hibernate
Ans. 
Spring JPA is a part of the Spring framework that provides an abstraction layer on top of JPA, while Hibernate is a standalone ORM framework.
• Spring JPA is a part of the Spring framework and provides additional features like transaction management, dependency injection, and aspect-oriented programming.

• Hibernate is a standalone ORM framework that provides mapping between Java objects and database tables, along with featu...read more
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Q2. What is cyclic barrier
Ans. 
Cyclic barrier is a synchronization aid that allows a set of threads to wait for each other to reach a common barrier point.
• Cyclic barrier is similar to CountDownLatch but can be reused after the barrier point is reached.

• It is initialized with a count of the number of threads that must invoke await() before the barrier is tripped.

• Threads wait at the barrier until all threads have invoked await(), then the barrier is re...read more
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Q1. SOA vs Micro Service
Ans. 
SOA focuses on large, monolithic services while Microservices are small, independent services.
• SOA is a centralized architecture with shared services, while Microservices are decentralized with each service having its own database.

• SOA is typically implemented using ESB (Enterprise Service Bus), while Microservices communicate via lightweight protocols like HTTP or messaging queues.

• SOA is more suitable for large enterpri...read more
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Q1. Is live data is life cycle aware. If it's aware what does ViewModel do?
Ans. 
Yes
• LiveData is lifecycle aware and can be used to observe changes in data.

• ViewModel provides a way to store and manage UI-related data across configuration changes.

• ViewModel can hold LiveData objects to provide data to the UI.

• LiveData and ViewModel work together to ensure data consistency and prevent memory leaks.
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Q2. How does viewmodel survive when activity is destroyed on configuration?
Ans. 
The ViewModel survives configuration changes by being retained by the system.
• ViewModels are designed to survive configuration changes like screen rotations or language changes.

• When an activity is destroyed and recreated, the ViewModel is not destroyed and retains its data.

• The ViewModel is associated with the activity's lifecycle and is retained until the activity is finished.

• The retained ViewModel instance can be acces...read more
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Q3. Advantage of mvp over mvc.
Ans. 
MVP offers better separation of concerns and easier unit testing compared to MVC.
• MVP separates the presentation layer from the business logic, making it easier to maintain and modify the codebase.

• MVP allows for easier unit testing as the presenter can be tested independently from the view.

• MVP provides better decoupling between components, enabling easier code reuse and scalability.

• MVP promotes a clear separation of con...read more
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Q4. How does SSL pinning works?
Ans. 
SSL pinning is a security technique that ensures a client only communicates with a server using a pre-defined public key.
• SSL pinning involves hardcoding the server's public key in the client's code or configuration.

• During the SSL handshake, the client checks if the server's public key matches the pinned key.

• If the keys match, the connection is established; otherwise, it is rejected.

• Pinning prevents man-in-the-middle at
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Q5. How do you achieve data security when saving data persistanly.
Ans. 
Data security can be achieved through encryption, access controls, backups, and regular security audits.
• Encrypt sensitive data using strong encryption algorithms.

• Implement access controls to restrict unauthorized access to the data.

• Regularly backup the data to prevent data loss.

• Conduct regular security audits to identify and fix vulnerabilities.

• Use secure protocols and communication channels for data transfer.

• Implement...read more
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Q6. Where to save encription key?
Ans. 
Encryption keys should be securely stored in a separate key management system.
• Encryption keys should not be stored alongside the encrypted data.

• Use a dedicated key management system (KMS) to store and manage encryption keys.

• Implement strong access controls and authentication mechanisms for the KMS.

• Consider using hardware security modules (HSMs) for added security.

• Regularly rotate encryption keys to minimize the impact
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