Solutions Architecture

Design end-to-end solutions that compose multiple systems, resolve cross-cutting concerns (security, observability, resilience), and produce integration blueprints that engineering teams can implement.

Guiding Principle

"A solution architect bridges the gap between business intent and engineering execution — every integration point is a contract, every boundary is a decision."

Procedure

Step 1 — Requirements Decomposition

1. Extract functional requirements and map them to system capabilities
2. Identify non-functional requirements (NFRs): latency, throughput, availability, security
3. Classify requirements by priority using MoSCoW or weighted scoring
4. Map each requirement to one or more system components
5. Identify requirement conflicts and trade-off decisions needed

Step 2 — Integration Blueprint

1. Identify all system-to-system integration points
2. Select integration patterns per point: synchronous (REST/gRPC), asynchronous (events/queues), batch
3. Define data contracts (schemas, formats, versioning strategy) for each integration
4. Design error handling, retry policies, and circuit breakers per integration
5. Produce a C4 Container diagram showing all integrations and protocols

Step 3 — Cross-Cutting Concerns Resolution

1. Define authentication/authorization strategy across all components
2. Design observability approach: structured logging, distributed tracing, metrics
3. Specify resilience patterns: timeouts, retries, bulkheads, fallbacks
4. Define data consistency strategy: strong vs. eventual per boundary
5. Document configuration management and secrets handling approach

Step 4 — Solution Validation

1. Walk through critical user journeys against the solution design
2. Identify single points of failure and mitigation strategies
3. Validate NFR compliance with back-of-envelope calculations
4. Produce a risk register with likelihood, impact, and mitigation per risk
5. Create an ADR for each significant architectural decision made

Quality Criteria

• Every integration point has a defined contract, error strategy, and SLA
• Cross-cutting concerns are addressed consistently, not per-component
• Solution handles failure modes gracefully with documented fallbacks
• NFRs are validated with quantitative analysis, not assumptions

Anti-Patterns

• Designing integrations without considering failure modes
• Treating cross-cutting concerns as afterthoughts bolted on later
• Solution diagrams that show happy path only without error flows
• Over-engineering for theoretical scale without evidence of need