Synechron Senior Software Engineer Interview Questions, Process, and Tips

Q1. Explain design patterns you know
Ans. 
Design patterns are reusable solutions to common software problems.
• Creational patterns: Singleton, Factory, Abstract Factory

• Structural patterns: Adapter, Decorator, Facade

• Behavioral patterns: Observer, Strategy, Command

• Architectural patterns: Model-View-Controller, Model-View-ViewModel

• Concurrency patterns: Thread Pool, Producer-Consumer

• Examples: Singleton ensures only one instance of a class exists, Factory creates obj...read more
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Q2. Explain the usage of that particular design pattern
Ans. 
The design pattern is used to solve a specific problem in software development.
• Design patterns are reusable solutions to common problems in software development.

• They provide a standard way to solve a problem that can be adapted to different situations.

• Examples of design patterns include Singleton, Factory, Observer, and Decorator.

• Using design patterns can improve code quality, maintainability, and scalability.
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Q3. Write code for that design pattern
Ans. 
Factory Method Pattern
• Defines an interface for creating objects, but lets subclasses decide which class to instantiate

• Encapsulates object creation logic to a separate class

• Useful when a class can't anticipate the type of objects it needs to create

• Example: java.util.Calendar.getInstance()

• Example: javax.xml.parsers.DocumentBuilderFactory.newInstance()
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Q4. What are the java8 features
Ans. 
Java8 features include lambda expressions, functional interfaces, streams, and default methods.
• Lambda expressions allow functional programming and simplify code.

• Functional interfaces enable the use of lambda expressions.

• Streams provide a way to process collections of data in a functional way.

• Default methods allow interfaces to have method implementations.

• Other features include the Date and Time API, Nashorn JavaScript
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Q1. Concurrent HashMap versus HashMap?
Ans. 
Concurrent HashMap is thread-safe and allows concurrent access, while HashMap is not thread-safe.
• Concurrent HashMap is suitable for multi-threaded environments where multiple threads can access and modify the map concurrently.

• HashMap is not thread-safe and can lead to data corruption if accessed concurrently by multiple threads.

• Concurrent HashMap uses internal locking mechanisms to ensure thread safety, while HashMap d...read more
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Q2. Partitioning a large Database.
Ans. 
Partitioning a large database involves dividing the data into smaller chunks to improve performance and manageability.
• Identify key columns for partitioning, such as date ranges or customer IDs.

• Choose a partitioning strategy, such as range partitioning or hash partitioning.

• Implement partitioning using database features like table partitioning in Oracle or partitioned tables in PostgreSQL.
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Interview was 1 hour.applied for nodejs and react developer. 30 mins interview questions from nodejs and reactjs. Had machine coding round for react.

Q1. Interviewer attacking personally and criticising instead of interviewing.
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Q2. Design patterns
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Q3. Collection’s framework
Ans. 
Collection's framework is a set of interfaces and classes that provide high-performance, high-quality implementations of data structures.
• Provides interfaces like List, Set, Map for storing and manipulating collections of objects

• Includes classes like ArrayList, LinkedList, HashSet, HashMap for concrete implementations

• Allows for easy iteration, sorting, searching, and manipulation of collections

• Supports generics to ensur
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Q4. Multi threading
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Q5. Springboot application
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