Persistent Systems Technical Support Lead Interview Questions and Answers

Hacker Rank test, problem solving. Java 8

Q1. Java 8 feature related questions.
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Q2. Jvm architecture and memory management
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Q3. Sql self join query and query tuning
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Q4. Spring boot microservices design pattern discussion
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Q1. Problem solving based on java and case study
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Q2. Team handling and management skills
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Q3. Docker and Orchetratetion framework
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Q4. Aws cloud and cicd and related technologies
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Q1. Design an weather app using android architecture components?
Ans. 
Design a weather app using Android architecture components.
• Use MVVM architecture pattern for separation of concerns

• Implement LiveData for real-time data updates

• Utilize Room database for offline data storage

• Integrate Retrofit for network calls to fetch weather data

• Use ViewModel to manage UI-related data in a lifecycle-conscious way
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Q1. Discussion on projects done
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Q1. Tell me about your framework
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My framework is a comprehensive set of tools, libraries, and best practices that I use to streamline the development process and ensure high-quality deliverables.
• Utilizes design patterns such as MVC for structuring code

• Includes libraries for common tasks like data manipulation and networking

• Emphasizes unit testing and continuous integration for code quality

• Integrates with popular tools like Git for version control

• Suppo...read more
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Q2. Type of selenium waits
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Types of Selenium waits include implicit, explicit, and fluent waits.
• Implicit wait: Waits for a certain amount of time before throwing a NoSuchElementException.

• Explicit wait: Waits for a certain condition to occur before proceeding further.

• Fluent wait: Waits for a condition to be true with a defined polling frequency.

• Example: driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);
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Q3. Xpath and CSS difference
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XPath is used to navigate through XML documents, while CSS is used to style HTML elements.
• XPath is more powerful and flexible for navigating XML documents

• CSS is more commonly used for styling HTML elements

• XPath uses path expressions to select nodes in an XML document

• CSS uses selectors to target specific HTML elements
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Q4. Coding to check list
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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. Explaining oops
Ans. 
OOPs (Object-Oriented Programming) is a programming paradigm based on the concept of objects, which can contain data and code.
• OOPs focuses on creating objects that interact with each other to solve complex problems

• Key principles of OOPs include encapsulation, inheritance, and polymorphism

• Encapsulation allows objects to hide their internal state and require all interaction to be performed through an object's methods

• Inhe...read more
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Q2. What design pattern you used
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I have used the Singleton design pattern in my previous projects.
• Used to ensure a class has only one instance and provides a global point of access to it

• Helps in managing global resources efficiently

• Example: Database connection manager in a web application
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Q3. What is primary key
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Primary key is a unique identifier for each record in a database table.
• Primary key ensures each record in a table is unique

• It can be a single column or a combination of columns

• Primary key values cannot be NULL

• Example: 'ID' column in a 'Users' table
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Q4. What is foreign key
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Foreign key is a field in a database table that links to a primary key in another table.
• Foreign key ensures referential integrity between related tables

• It helps maintain relationships between tables

• Foreign key constraints can be used to enforce data integrity
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Q5. What is unique key
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A unique key is a field or combination of fields in a database table that uniquely identifies each record in the table.
• A unique key ensures that no two records in a table have the same values for the specified key fields.

• It can be a single field or a combination of multiple fields.

• Unique keys are used to enforce data integrity and prevent duplicate records.

• Examples: Primary key, Unique constraint
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Q6. Different types of dbs
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Different types of databases include relational, NoSQL, graph, and document databases.
• Relational databases store data in tables with rows and columns (e.g. MySQL, PostgreSQL)

• NoSQL databases are non-relational and can handle unstructured data (e.g. MongoDB, Cassandra)

• Graph databases use graph structures for semantic queries (e.g. Neo4j, Amazon Neptune)

• Document databases store data in documents (e.g. Couchbase, Firebase)
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Q1. SOA vs Micro Service
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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. Java, Spring Boot, Kafka, MySQL, Microservices
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