Monolith vs Microservices in 2025: Why Modular Monoliths Win

Over the last decade, microservices became the default architecture choice for growth-stage companies. However, high operational overhead, distributed transaction failures, and complex CI/CD pipelines have led to a major renaissance of the **Modular Monolith**.

Advantages of Modular Monoliths

• **Zero Network Latency**: Internal module calls happen in-memory rather than across HTTP/gRPC network boundaries.
• **Simplified Deployment**: Single artifact deployment drastically reduces Kubernetes cluster complexity and cloud infrastructure costs.
• **Easy Refactoring**: Type changes propagate across module boundaries instantly during compilation.

Structural Organization

A modular monolith isolates domain boundaries strictly using explicit public module interfaces while retaining a shared runtime database deployment.