Practical Techniques to Keep Microservices Loosely Coupled

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Tight coupling in microservices occurs when services depend on each other's internal details, causing a change in one to ripple through others and making systems fragile. Developers can reduce this by defining explicit, versioned API contracts so services interact through stable interfaces rather than shared database schemas. Asynchronous messaging, where services publish and subscribe to events via a message broker, eliminates temporal dependency between services. Patterns like the Backend for Frontend (BFF) aggregate data from multiple services for clients, shielding them from internal topology changes. Circuit breakers further improve resilience by failing fast when a downstream service is unresponsive, preventing cascading failures across the system.

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