Architectural Patterns

The strategic + tactical framework for turning business reality into software. Bounded contexts, ubiquitous language, and the bridge between problem and solution space.

The building blocks inside a bounded context — entities with behavior, value objects, aggregates, domain services. Trading anemic models for rich ones.

The boundaries between contexts and the patterns for integrating them. Domains, sub-domains, bounded contexts, context maps, and the seven integration patterns.

A tour of the architectural styles in modern use — traditional and modern — and how to combine them in a multi-tenant SaaS platform.

The pragmatic middle ground — clean module boundaries inside a single deployable unit. The architecture Shopify, GitHub, and Basecamp run at scale.

Independent services aligned to business capabilities. The benefits, the costs, the boundary problem, and what the industry has learned after a decade of doing this.

From request/response to events. EDA, CQRS, event sourcing, and saga patterns for distributed transactions in multi-tenant SaaS.

Responsive, resilient, elastic, message-driven systems. The four principles of the Reactive Manifesto and how they apply to multi-tenant SaaS at scale.

Functions-as-a-Service. Pay-per-execution, autoscaling, no infrastructure to manage. Where it shines, where it bites, and the cold-start trade-off.

One application instance, many tenants. Isolation models, tier-based service levels, noisy-neighbor mitigation, and the operations of a SaaS platform.