Understand software architecture through timeless concepts, trade-offs, and interactive simulations.

Arch Essence starts with architectural styles and will grow over time into an interactive handbook for software architects, technical leads, and developers who want to design better systems.

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Architectural Styles

Begin with the foundational architectural styles that shape how systems are structured. Each style represents a set of constraints, trade-offs, and design decisions that influence everything from team organization to deployment strategy.

Layered Architecture

Separate responsibilities into horizontal layers: presentation, application, domain, and infrastructure.

Hexagonal Architecture

Protect the core domain from external systems using ports and adapters.

Modular Monolith

One deployable application with strong internal module boundaries.

Microservices

Independently deployable services organized around business capabilities.

Event-Driven Architecture

Connect system components through events for loose coupling and asynchronous workflows.

Documentation

Architecture documentation is not about writing everything down. It is about preserving the information that helps teams understand, maintain, and evolve a system.

Architecture Decision Records

Capture the context, decision, consequences, and stakeholders behind important architectural choices.

Simulations

Interactive simulations help build intuition about distributed systems concepts that are difficult to understand through text alone.

CAP Theorem: ATM Simulation

Explore the trade-off between consistency and availability during a network partition using a simple ATM scenario.

Arch Essence is intentionally starting small and growing one concept at a time — each page written with care and enough depth to be genuinely useful.