System Architecture

System architecture dictates how we structure the macro components of WordLoop. Our philosophy relies on pragmatic Domain-Driven Design (DDD) to build scalable, maintainable distributed systems.

Right-Sized Microservices

We introduce new services specifically to address distinct bounded contexts or unique runtime requirements (e.g., separating high-throughput synchronous APIs from async, computationally heavy worker pipelines).

• Intentional Boundaries: We split services only when they provide a measurable benefit over shared modules.
• Consolidated Operations: We favor grouping related capabilities together to streamline observability, deployment, and cognitive load.
• Independent Deployability: We design services so they can be deployed entirely on their own, allowing teams to ship features independently without synchronizing with peers.

Domain Separation

We enforce strict boundaries to keep our systems decoupled and resilient:

1. Isolated State: Services manage their own persistence layers and communicate exclusively over explicit APIs or Events. This preserves data integrity and simplifies database migrations.
2. Clear Contracts: We define system boundaries using machine-readable contracts—such as OpenAPI for synchronous APIs and robust schemas for events.

Communication Patterns

Event-Driven as Default

We favor asynchronous event-driven design for cross-service communication. By using queues and pub/sub architecture for state changes and multi-step pipelines, we decouple scaling requirements and ensure extreme system resiliency.

Synchronous RPC for Real-Time Needs

We utilize synchronous communication when a client absolutely requires a real-time response to proceed. In these scenarios, we leverage fast caches to optimize latency and minimize direct inter-service chatter.

Designing for Resilience

We construct our network topology to handle disruptions gracefully.

• Graceful Degradation: We rely on circuit breakers to protect downstream systems and provide functional fallbacks when dependencies struggle.
• Defined Lifespans: We equip every remote call with a concrete timeout and propagate context limits, ensuring our platform remains responsive under heavy load.