Meta Senior Software Engineer Interview Questions and Answers

Mixed conceptual questions from java8, Spring Boot and SQL and microservices

Q1. One round technical question and coding on Java, Java 8, Spring boot,Rest webservices, SQL. Code for rest API using jpa for CRUD.
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Q2. Singleton pattern for thread safety .
Ans. 
Singleton pattern ensures only one instance of a class is created and provides a global point of access to it.
• Use lazy initialization to create the instance only when needed.

• Use synchronized keyword to make the getInstance() method thread-safe.

• Consider using double-checked locking for better performance.

• Use enum to implement singleton pattern as it is inherently thread-safe.
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Q3. Linked list implementation
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Linked list is a data structure where each element points to the next element in the sequence.
• Nodes contain data and a reference to the next node

• Insertion and deletion can be done efficiently in a linked list

• Traversal starts from the head node and follows the next pointers
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Q1. Parenthesis balancing question
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Q2. Caching in Hibernate
Ans. 
Caching in Hibernate improves performance by storing frequently accessed data in memory.
• Hibernate supports first-level cache at session level

• Second-level cache can be configured at session factory level

• Caching strategies include read-only, read-write, and transactional

• Cache providers like Ehcache, Infinispan, and Hazelcast can be used
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Q3. Maven scope questions
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Q4. Ci and CD concept
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Q1. Salary negotiation
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Q1. Basic spring , Sql questions and a puzzle
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Q1. Questions based on spring boot, annotations, design patterns.
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Q1. Singleton Design pattern, one programming question. Work related questions
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Q1. Explain about java threads
Ans. 
Java threads are lightweight processes that enable concurrent execution of code.
• Threads allow multiple tasks to be executed simultaneously within a single program.

• They share the same memory space and can communicate with each other.

• Java provides built-in support for creating and managing threads through the Thread class.

• Threads can be created by extending the Thread class or implementing the Runnable interface.

• Thread s...read more
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Q1. How many type of authentication can be implemented
Ans. 
There are multiple types of authentication that can be implemented, including password-based, token-based, biometric, and multi-factor authentication.
• Password-based authentication: Users authenticate themselves using a password.

• Token-based authentication: Users authenticate themselves using a token, such as a one-time password or a security key.

• Biometric authentication: Users authenticate themselves using their unique ...read more
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Q1. Develop springboot api for a given table
Ans. 
Develop a Spring Boot API for a given table
• Create a Spring Boot project with necessary dependencies

• Define entity class representing the table

• Create a repository interface extending JpaRepository

• Implement service layer with business logic

• Create REST controller with CRUD operations
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