What are the key differences between monolithic and microservices architectures, and in which scenarios would you choose one over the other?

In my final year, I worked on a college project to develop a Student Management System. We chose a monolithic architecture because it was a small team and the application was simple. This allowed us to manage the codebase easily and deploy quickly. We built all features, like student registration and course management, in one unified application. This experience taught me the importance of simplicity in development, especially when the project scope is limited and the team is small.

While volunteering for a local NGO, I helped organize community events. We initially used a simple monolithic application to manage registrations and event details. However, as we started to expand our events and required more features, like payment processing and feedback collection, we realized that a more modular approach could help. We began discussing the benefits of transitioning to a microservices architecture, which would allow us to independently scale different features without affecting the entire application. This experience highlighted how different project needs could shift architectural decisions.

In my first job, I was involved in developing a marketing application for a startup. Initially, we built it as a monolithic application, which was effective for rapid prototyping. However, as user demand increased, we encountered performance issues. This led us to gradually transition to a microservices architecture. We could then scale individual services, like user authentication and campaign management, based on their load. This shift taught me the importance of aligning architecture with growth and scalability needs.