Microservice decomposition is a critical architectural decision that can make or break a system. This guide provides a structured framework for evaluating when to split a monolith into microservices and when to keep services together. Key criteria include team size, domain boundaries, data ownership, and operational complexity. For small teams or tightly coupled domains, a monolith may be more efficient. For large teams with clear domain boundaries, microservices can improve autonomy and scalability. The article also discusses anti-patterns like premature decomposition and over-engineering. This framework helps architects and tech leads make informed decisions based on real-world trade-offs rather than hype.
A decision framework for microservice decomposition based on team size, domain boundaries, and operational complexity.