Architecture Patterns & Reference Models
Risk-managed, delivery-aware engineering choices not ideology.
This page defines how Clavon thinks about software architecture decisions not as ideology, but as risk-managed, delivery-aware engineering choices.
Architecture is not about fashion.
It is about making the right trade-offs explicit and controlling long-term cost, risk, and operability.
Why Architecture Decisions Fail in Practice
Across startups, enterprises, and regulated environments, architecture failures usually come from the same root causes
Architecture chosen too early or too late
Decisions driven by tooling hype instead of constraints
Over-optimisation for scale before product-market fit
Under-investment in operability, testing, and observability
No explicit ownership or evolution model
Architecture diagrams that do not match how the system actually runs
Clavon addresses this by treating architecture as:
- a living decision system, not a static diagram
- a delivery enabler, not a blocker
- a risk control mechanism, not a theoretical exercise
Architecture Decision Framework
Every architecture decision we make is evaluated against six non-negotiable dimensions
Business Volatility
How often will requirements change?
Scale Profile
What kind of scale matters (users, data, throughput, regions)?
Delivery Speed
How fast must teams ship without breaking production?
Team Topology
How many teams, how distributed, what maturity?
Risk & Compliance
What happens when things go wrong?
Operability
Can the system be monitored, debugged, and recovered?
If a pattern cannot be defended across these dimensions, it is rejected.
Core Architecture Patterns
Primary patterns with explicit guidance on when to use, when not to, and what breaks if misused
Monolithic Architecture (Intentional Monolith)
What It Is
A single deployable unit containing domain logic, APIs/UI, and data access. Important: This is not a "legacy monolith" by default.
When Right
- Early-stage products and MVPs
- Small teams (≤ 8–10 engineers)
- Unclear domain boundaries
- +2 more
When Bad
- Multiple teams pushing changes daily
- Release coordination becomes painful
- +2 more
Guidance
- Start with a clean, layered monolith
- Enforce domain boundaries internally
- +2 more
Modular Monolith (Preferred Default)
What It Is
A single deployable system with strict module boundaries, domain ownership enforced at code level, and internal contracts between modules.
When Right
- Product is gaining traction
- Domain complexity is increasing
- Multiple teams are contributing
- +2 more
Guidance
- Modules must have explicit interfaces
- Independent test suites
- +2 more
Microservices Architecture
What It Is
A system composed of independently deployable services, decentralized data ownership, and API- or event-based communication.
When Right
- Clear domain boundaries already exist
- Multiple autonomous teams
- Independent scaling is required
- +2 more
When Bad
- Small teams
- Unstable domains
- +3 more
Guidance
- Clear service ownership
- Service-level SLIs/SLOs
- +3 more
Event-Driven Architecture (EDA)
What It Is
Systems communicate through events, asynchronous messaging, and decoupled producers and consumers.
When Right
- High throughput or real-time processing
- Loose coupling is required
- Event sourcing or auditability is important
- +1 more
When Bad
- Simple CRUD systems
- Teams unfamiliar with async systems
- +2 more
Guidance
- Events are contracts, not notifications
- Event schemas are versioned
- +2 more
Hybrid Architectures (Most Real Systems)
What It Is
Most production systems are modular monoliths with extracted services, synchronous APIs plus async events, and legacy systems integrated via adapters.
Guidance
- Hybrid is not a failure—it is intentional evolution
- Clear integration patterns
- +2 more
Integration Patterns (Cross-Cutting)
Clavon standardizes on the following:
Synchronous
- REST APIs for request/response
- Clear versioning and backward compatibility
- Timeouts, retries, and circuit breakers
Asynchronous
- Events for state change
- Commands for intent
- No shared databases
- Explicit ownership
Security & Compliance Considerations
Architecture choices directly impact:
Clavon enforces:
- Least-privilege access
- Explicit trust boundaries
- Security-by-design reviews
- Compliance-aware logging
Architecture Evolution Model (Critical)
We do not design "final architectures". We design:
- Current state
- Next viable architecture
- Clear evolution triggers
Example triggers:
Common Anti-Patterns We Actively Prevent
Microservices by default
"Temporary" shortcuts with no exit plan
Architecture diagrams disconnected from code
Unowned services and integrations
Tool-driven architecture
Deliverables Clients Receive
Architecture decision records (ADRs)
Reference architecture diagrams (SVG-ready)
Integration standards
Quality and testing implications per pattern
DevOps and operability requirements
Evolution roadmap with triggers
Why This Matters
Architecture determines:
Poor architecture compounds risk.
Good architecture compounds leverage.
Ready to Build with the Right Architecture?
Let Clavon help you make risk-managed, delivery-aware architecture decisions.