Architecture Patterns

Implement proven backend architecture patterns including Clean Architecture, Hexagonal…

An implementation guide for proven backend architecture patterns: Clean Architecture, Hexagonal (Ports & Adapters), and Domain-Driven Design. It shows how to keep business logic independent of frameworks and databases, with full worked code for entities, use cases, repositories, ports, adapters, value objects, and aggregates, plus enterprise resilience patterns like circuit breakers and graceful degradation.

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Prices include 20% VAT. · Forged on real agency work · one-time, no lock-in

  • Type Skill
  • Category Development
  • Delivery Email · instant
  • License One-time
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forgehouse, architecture-patterns

Inside the run · no black box

See the actual work before you buy it.

Clean Architecture is earned, not defaulted. The first check is whether the domain justifies the layers at all; only then do ports, adapters and DDD tactics go in:

  1. Starts with the over-engineering check: simple CRUD does not get clean architecture; every added layer must answer what would be lost without it.
  2. Lays the layers so dependencies only point inward: entities and abstract interfaces live in the domain, use cases orchestrate business rules, adapters implement, frameworks and drivers stay at the outermost ring.
  3. The domain defines ports (IUserRepository, PaymentGatewayPort, NotificationPort) and infrastructure provides the adapters (Postgres, Stripe, Mock), so the core is testable with zero database or external service.
  4. Runs the DDD tactical pass: value objects immutable and self-validating, aggregates as consistency boundaries with the root as the only entry point, repositories defined only on aggregate roots, cross-context communication via domain events.
  5. External systems pass through an anti-corruption layer: a Stripe charge.succeeded webhook becomes a domain PaymentCompleted event; foreign data shapes, retries and timeouts never leak into the core.
  6. Wraps every external call in resilience patterns: circuit breaker opening after five consecutive failures with a 30-second half-open probe, graceful degradation so the site keeps working, exponential backoff retry that never retries on 4xx.
Use cases · what happens when you plug it in

One power source. 6 lines out.

architecture-patterns · core

core active · 6 lines

  1. Designing a new backend system with clear separation of concerns

    ✓ designing a new backend
  2. Refactoring a tightly coupled monolith for testability and maintainability

    ✓ refactoring a tightly co…
  3. Implementing the dependency rule so the domain doesn't depend on frameworks

    ✓ implementing the depende…
  4. Modeling a domain with bounded contexts, aggregates, and value objects

    ✓ modeling a domain with b…
  5. Swapping infrastructure (DB, payment provider) without touching the core

    ✓ swapping infrastructure…
  6. Adding circuit breakers and graceful degradation to external integrations

    ✓ adding circuit breakers
Benefits · what you walk away with

Yours to keep.

Drag time forward. Watch what stays.

Forever

That's what owning means.

The rented stack

ai writing tool: subscription

expired · access lost

analytics suite: subscription

expired · access lost

design platform: subscription

expired · access lost

(nothing left)

Your forge

  1. A core you can unit-test without a database, UI, or external services

    license: perpetual
  2. Freedom to swap technologies by writing a new adapter, not rewriting logic

    license: perpetual
  3. Lower cognitive load and cleaner boundaries via bounded contexts

    license: perpetual
  4. A resilient system that keeps running when an external service goes down

    license: perpetual

subscriptions expire · deeds don't

What's included · the full manifest

Everything in the box.

Pick a piece up. Watch it work.

Clean Architecture directory structure with full entity/use-case/adapter code

part 01 of 06 · in the box

6 parts · one working system · ships instantly by email

Who it's for

This wasn't forged for everyone.

  • Not for you if you'd rather rent a tool than own one.
  • Not for you if you want someone else to run your stack.
  • Not for you if you're happy guessing.
Still here? Good.

Backend engineers and architects building or refactoring complex systems that need to stay testable and maintainable at scale.

then this was forged for you.

Works with

Universal by design: these run in any AI. Delivered in the open Agent Skills + MCP format (native in Claude); ChatGPT, Gemini, Cursor and Copilot adapt the same files their own way.

  • Claude Native format
  • ChatGPT Adapts via open standards
  • Gemini Adapts via open standards
  • Cursor Adapts via open standards
  • Copilot Adapts via open standards
Questions · still in the air

Catch what's on your mind.

the air is clear. nothing between you and the forge.
catch a spark: the forge will answer

  1. Does this assume a particular language or framework?

    The patterns are language-agnostic by design, since the whole point is keeping the domain independent of any framework, and they come with full worked code for entities, use cases, repositories, ports, and adapters. The patterns don't dictate a stack; you adapt the examples to yours.

  2. Won't Clean and Hexagonal just add layers of indirection I don't need?

    For a complex system that indirection is what makes the domain testable without a database or framework attached. The cost is real, which is why the guidance aims at systems that need to stay maintainable, not throwaway scripts.

  3. I'm building a basic CRUD app, is this the right fit?

    Probably not; these patterns earn their keep when business logic is complex and long-lived, and on simple CRUD they're overhead. Reach for them when coupling is actively hurting testability, not preemptively.

  4. How is it delivered?

    By email right after purchase: ready to run, downloaded instantly, no setup wait.

  5. One-time or subscription?

    A one-time purchase; no subscription or hidden fees. VAT (20%) is included.

  6. Can I get a refund?

    As a digital product, it can’t be refunded once downloaded. That’s why we show exactly what’s inside and who it’s for, right here.