What are the advantages and disadvantages of monolithic and microservices architecture when developing a system?

Monolithic Architecture:

Advantages:

• Simplicity of development and deployment, especially in the initial stages.
• Fewer complexities with inter-process communication.
• Easier to debug and test a single application.

Disadvantages:

• Difficult to scale individual parts of the application.
• Changing one part requires rebuilding and redeploying the entire monolith.
• Challenges in implementing new technologies in individual modules.
• As the codebase grows, maintenance becomes more complex.

Microservices Architecture:

Advantages:

• Scalability of individual services as needed.
• Ability to use different technologies and languages for different services.
• Independent development and deployment cycles for services.
• Improved resilience: failure of one service does not lead to the collapse of the entire system.

Disadvantages:

• Complexity in organizing interactions between services (RPC, REST, messaging).
• Need to manage distributed transactions and data consistency.
• More complex testing and debugging.
• Infrastructure requirements (orchestration, monitoring, logging).

The choice depends on the size and requirements of the project: for small applications, a monolith is often sufficient, while for scalable and complex systems, microservices offer more flexibility.