modular-monolith-architecture

Designing a monolithic application for future microservices migration requires creating highly decoupled modules separated by Bounded Contexts with strict encapsulation. Modules must communicate via in-process interfaces or mediators and depend only on shared core libraries or strictly defined public APIs.

Logical isolation in modular monolithic architecture is the practice of separating modules by Bounded Contexts with strict encapsulation. This ensures that each module operates independently within the monolith, making it easier to transition them into separate microservices later.

Modules in a decoupled monolith should communicate via internal interfaces or mediators using in-process communication. They can only depend on shared core libraries or interact through strictly defined public APIs to maintain architectural boundaries.

A modular monolith requires Hexagonal or Clean architecture patterns at the module level by following the Ports and Adapters pattern. This ensures each module remains highly decoupled and prepared for future microservices extraction.

The best way to structure an e-commerce platform for future microservices extraction is designing a modular architecture with logically isolated components for payment processing, user management, and inventory management that can independently evolve into separate microservices.