This repository is a reference architecture showcase extracted from a real, long-running production system. It focuses on architectural structure, execution boundaries, and ongoing modernization work --- not on business-specific logic or a ready-to-deploy application.
The broader system context is described in the corresponding case study: 👉 https://rocketdeploy.dev/en/case-studies/commerce-platform-modernization/
Architectural evolution of this showcase is documented separately in: 👉 docs/showcase-evolution-log.md
Business rules, proprietary workflows, customer data, and sensitive identifiers have been removed or anonymized. This repository is provided for technical architecture review and educational purposes only.
This system is a long-running PHP-based monolith built on an MVC framework and continuously used in production for approximately a decade.
In its current state, it is best described as a legacy modular monolith under active boundary formalization.
The architecture combines:
- server-rendered operational workflows,
- module-level JSON and internal API endpoints,
- scheduler-driven and long-running background execution,
- direct external-provider integrations,
- relational persistence,
- object-storage-backed runtime artifacts.
The current engineering objective is controlled architectural evolution:
Preserve operational continuity while progressively introducing explicit module boundaries, application-layer contracts, safer runtime patterns, and extraction-ready seams for future service decomposition.
This document focuses on architecture, boundaries, and modernization trajectory --- not on business logic.
At runtime, the platform exposes:
- a primary backend application surface,
- dedicated UI and API endpoints for selected operational domains,
- internal integration endpoints,
- cyclic and long-running background processes,
- direct integrations with external systems.
The repository also contains infrastructure/runtime elements for containerized execution and job orchestration.
The system remains a single deployable runtime, but the internal structure now shows clearer domain and execution boundaries than a flat legacy monolith.
For architectural analysis, review in this order:
- runtime bootstrap and dependency wiring,
- registered modules and route surface,
- HTTP controllers as transport entry points,
- application use-cases and orchestration services,
- repository and integration adapter boundaries,
- background job runtime wrappers,
- artifact and persistence handling.
A useful reading strategy is to compare older legacy orchestration paths with newer module-owned flows where explicit contracts are already visible.
The current system can be described as a stabilized legacy monolith moving toward explicit modular architecture:
- single-process application runtime,
- shared relational database,
- MVC-based presentation layer,
- mixed legacy Active Record and newer module-oriented application flows,
- embedded provider integrations,
- script-triggered and containerized background execution,
- partial movement from local filesystem assumptions toward object storage.
Some responsibilities remain tightly coupled, but selected areas now show clearer contracts, ports, adapters, and dedicated use-case layers.
Modernization is therefore not only planned --- it is already visible in the codebase.
Logical boundaries currently identifiable:
- Presentation Boundary --- backend controllers, views, layouts, and UI endpoints
- Application Boundary --- use-cases, orchestration services, command/result contracts
- Domain / Persistence Boundary --- entities, repositories, projections, workflow state
- Integration Boundary --- provider clients, transport logic, credential resolution, adapter implementations
- Execution Boundary --- request/response lifecycle versus cyclic or long-running background execution
- Artifact Boundary --- temporary local processing versus durable object-storage-backed artifacts
Physical deployment remains single-unit, but logical separation is now more explicit in selected domains.
The repository now contains visible module-oriented structure rather than only implicit functional grouping.
Examples of identifiable component areas:
- core application configuration and shared runtime wiring,
- marketplace integration boundary,
- listings-oriented application and ingestion flows,
- messaging/thread synchronization boundary,
- shipping/integration registry boundary,
- operator-facing notification surface,
- background job runtime wrappers and lock helpers,
- object-storage-backed artifact handling.
This is still not runtime isolation, but it creates clearer internal seams for future extraction.
Integration strategies visible in the system include:
- direct HTTP invocation,
- XML-based request/response handling,
- provider-specific transport logic,
- environment-configured credentials and runtime behavior,
- adapter-based integration access in selected domains.
A key modernization indicator is the appearance of explicit integration-facing application contracts in some areas, reducing the need for controllers or legacy models to talk directly to provider clients.
This shows movement away from integration sprawl toward better-defined boundary ownership.
- HTTP request enters controller
- Application runtime resolves dependencies and route
- Access and session context are applied
- Controller delegates to legacy orchestration or module-level application flow
- Domain mutation and optional integration work occur
- HTML or JSON response is returned
- UI or internal caller invokes a module endpoint
- Controller acts as transport adapter
- Use-case/service handles orchestration
- Structured payload is returned
- Long-running container or scheduler invokes a job wrapper
- Wrapper applies jitter, lock acquisition, and timeout policy
- Target script executes
- Structured runtime events are emitted
- Loop sleeps and repeats
- External payload is fetched
- Raw payload is durably stored
- Projection updates internal state
- Reprocess path can replay stored payload without re-fetching source
This combination of legacy and newer execution styles is central to the current transitional architecture.
Primary persistence remains:
- relational database,
- entity-driven workflow state,
- module or legacy repository access patterns.
Additional state layers now include:
- append-stored raw external payloads in selected domains,
- deferred and cyclic processing state,
- object-storage-backed generated artifacts,
- temporary local workspace usage for bounded processing only.
This is an important modernization step because durable system state is being separated more clearly from node-local execution details.
Reliability mechanisms visible in the current system include:
- application and runtime logging,
- inline integration error handling,
- timeout-bound background execution,
- advisory locking for cyclic jobs,
- jitter to reduce synchronized restarts,
- reprocess/replay support for selected ingestion paths,
- safer artifact persistence patterns in selected workflows.
The system is not yet fully centralized in observability or retry policies, but the codebase already shows stronger operational safeguards than a typical legacy cron-based monolith.
High-level security and safety controls include:
- session and role-sensitive backend context,
- controller-level access checks,
- request validation,
- environment-based credential handling,
- stricter ownership checks in selected operational flows,
- signed-access patterns for some stored artifacts.
The broader architectural direction is toward more explicit trust and policy boundaries rather than implicit controller- or model-level enforcement only.
Historical strengths of this architecture:
- single deployable unit simplified operations,
- shared runtime reduced duplication,
- in-process evolution enabled long-term delivery continuity.
Trade-offs:
- legacy orchestration still spans multiple layers,
- integration density creates coupling pressure,
- mixed architectural styles coexist during refactoring,
- some module boundaries are clearer than others.
This is not a clean-slate architecture. It is a hybrid transitional state, which is exactly what makes it realistic.
Recommended review approach:
- inventory entry points,
- distinguish transport adapters from orchestration logic,
- identify where explicit contracts already exist,
- locate integration-dense areas,
- compare legacy and newer execution paths,
- evaluate extraction readiness by coupling and runtime ownership.
The most valuable review question is not “Is this already fully modularized?” but rather:
Which architectural boundaries are already explicit, and which are still implicit legacy coupling zones?
The repository currently represents a transition from:
- legacy operational monolith
- to stabilized modular monolith
- to selective boundary formalization in high-change and high-integration domains
Current indicators of evolution include:
- explicit module registration,
- application ports and adapter-based access in selected domains,
- use-case-driven orchestration in newer areas,
- raw-first ingestion and reprocessing support,
- hardened background runtime behavior,
- object-storage-backed artifact direction.
Planned evolution remains incremental and extraction-driven rather than rewrite-driven.
This repository reflects a realistic modernization stage:
A production-proven legacy system that is being systematically evolved toward clearer boundaries, safer execution, and better extraction readiness --- while preserving continuity of an active operational platform.
The transformation is incremental, contract-oriented, and grounded in what is already visible in code.
If you are dealing with a similar challenge --- modernizing a long-lived operational monolith, introducing explicit boundaries without a full rewrite, or preparing a production system for future service extraction