Synechron Senior Software Developer Interview Questions and Answers

Q1. What is the role of cluster load balancing in Node.js?
Ans. 
Cluster load balancing in Node.js helps distribute incoming requests among multiple instances of the application to improve performance and reliability.
• Cluster load balancing allows Node.js applications to utilize multiple CPU cores efficiently by creating child processes to handle incoming requests.

• It helps prevent a single instance of the application from becoming overwhelmed with requests, leading to improved perfor...read more
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Q2. What is the CQRS (Command Query Responsibility Segregation) design pattern?
Ans. 
CQRS is a design pattern that separates the read and write operations of a system, using different models for each.
• CQRS separates the responsibility of handling commands (write operations) from queries (read operations).

• It helps in achieving better scalability, performance, and maintainability by using different models for reads and writes.

• For example, in a banking application, the write model may handle transactions a...read more
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Q3. How do transactions work in a database?
Ans. 
Transactions in a database ensure that a group of operations are completed successfully or rolled back if any part fails.
• Transactions help maintain data integrity by ensuring all changes are either committed or rolled back as a single unit.

• ACID properties (Atomicity, Consistency, Isolation, Durability) are maintained in transactions.

• Examples of transactions include transferring money between bank accounts or booking a ...read more
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Q4. How does durability function in ACID databases?
Ans. 
Durability ensures that once a transaction is committed, it will persist even in the event of a system failure.
• Durability guarantees that once a transaction is committed, it will not be lost even in the event of a system crash.

• This is typically achieved through mechanisms like write-ahead logging and periodic checkpoints.

• Examples of ACID-compliant databases that ensure durability include PostgreSQL, Oracle, and SQL Ser...read more
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Q1. What are the advantages of using a microservice architecture?
Ans. 
Advantages of using a microservice architecture include scalability, flexibility, fault isolation, and technology diversity.
• Scalability: Microservices allow for individual components to be scaled independently, leading to better resource utilization.

• Flexibility: Each microservice can be developed, deployed, and updated independently, allowing for faster innovation and reduced time to market.

• Fault Isolation: If one micr...read more
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Q2. How does replication work in a database?
Ans. 
Replication in a database involves copying and distributing data across multiple servers to ensure redundancy and availability.
• Replication involves creating multiple copies of the database on different servers.

• Changes made to the primary database are then propagated to the replica databases.

• Replication can be synchronous or asynchronous, with synchronous replication ensuring data consistency but potentially impacting p...read more
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Q3. Why CQRS works
Ans. 
CQRS works by separating read and write operations in a system, improving scalability and performance.
• CQRS allows for optimized read and write operations by using separate models for each

• It simplifies the design of the system by separating concerns

• Improves scalability as read and write operations can be scaled independently

• Enables better performance by allowing for optimized data storage and retrieval strategies
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One question related to string manipulation which is of medium level difficulty.

Q1. Asked questions related to Java and Spring Boot.
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Q2. They also asked questions related to previous projects.
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Technical round: where they will ask you about the technical questions in your technology and few coding questions.

Q1. Mostly on previous work done And general tableau questions
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