The Digital Group Technical Lead Interview Questions and Answers

Q1. Questions about Interfaces,, Abstract Classes, Multi-Threading, Parallel Programming concepts, SQL Server
Add your answer

Q1. Questions about Design Patterns, SOLID Principles, Extension Methods, LINQ, Entity Framework
Add your answer

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.
Add your answer

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.
Add your answer

Q1. Java Collections
Add your answer
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
Answered by AI
View 1 more answer

Q1. Completable future
Add your answer
Q2. Microservice architecture
Add your answer

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
Answered by AI
Add your answer
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
Answered by AI
Add your answer

Q1. Sql queries join and left join
Add your answer

Q1. Introduce yourself
Add your answer

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
Answered by AI
Add your answer

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.
Answered by AI
Add your answer
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
Answered by AI
Add your answer
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
Answered by AI
Add your answer
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
Answered by AI
Add your answer
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
Answered by AI
Add your answer
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
Answered by AI
Add your answer

Q1. Spring batch questions Questions related to asynch process
Add your answer
Q2. Java 8 stream api questions
Add your answer

Q1. Types of call in cobol. What is file status 39. What is AICA in CICS. Why do we use cursor in Cobol+db2 program. What are some compiler options. What is the utility for bind. How would you dynamically read...read more
Ans. 
Technical Lead interview questions on COBOL, DB2, and CICS
• Types of call in COBOL

• File status 39 indicates end-of-file reached

• AICA is Abend-AID CICS Abend RSN (Reason) Code

• Cursor is used to fetch rows from DB2 tables sequentially

• Compiler options include OPTIMIZE, DEBUG, and LIST

• BIND utility is used to bind DB2 programs to database

• Dynamic VSAM file reading can be done using READNEXT function

• -911 SQLCODE indicates deadlock...read more
Answered by AI
Add your answer
Q2. What is most satisfactory work that you did.
Add your answer

Q1. Why you left previous organization. What is current CTC. What is expected CTC. Where would you be interested to work for career progression(what you want to pursue)? Are you willing to relocate? Explain th...read more
Add your answer