Solution Architecture Document Template
Instructions: Replace all sections marked with [brackets] with your content. Remove this instruction block when complete.
Solution Architecture: [Project/System Name]
Version: [1.0]
Date: [YYYY-MM-DD]
Status: [Draft | In Review | Approved]
Author(s): [Name(s)]
Reviewers: [Name(s)]
Approver: [Name]
Document Control
| Version | Date | Author | Changes |
|---|---|---|---|
| 0.1 | YYYY-MM-DD | Name | Initial draft |
| 1.0 | YYYY-MM-DD | Name | Approved version |
Executive Summary
[2-3 paragraph summary covering:
- What problem this solution solves
- High-level approach
- Key technology decisions
- Expected outcomes Audience: Non-technical stakeholders, executives]
Table of Contents
- Introduction
- Business Context
- Requirements
- Constraints & Assumptions
- Architecture Overview
- Detailed Design
- Data Architecture
- Security Architecture
- Integration Architecture
- Infrastructure & Deployment
- Non-Functional Requirements
- Architecture Decisions
- Risks & Mitigation
- Implementation Plan
- Appendices
1. Introduction
1.1 Purpose
[Describe the purpose of this document and what it aims to achieve]
1.2 Scope
[Define what is in scope and out of scope for this architecture]
In Scope:
- [Item 1]
- [Item 2]
Out of Scope:
- [Item 1]
- [Item 2]
1.3 Audience
[Identify who should read this document]
- Primary: [e.g., Development teams, technical leads]
- Secondary: [e.g., Product managers, QA teams]
- Tertiary: [e.g., Business stakeholders]
1.4 Definitions & Acronyms
| Term | Definition |
|---|---|
| [Acronym] | [Definition] |
2. Business Context
2.1 Business Problem
[Describe the business problem or opportunity this solution addresses]
2.2 Business Objectives
- [Objective 1 - be specific and measurable]
- [Objective 2]
- [Objective 3]
2.3 Success Criteria
[How will success be measured?]
- [Metric 1: e.g., Reduce processing time by 50%]
- [Metric 2: e.g., Support 100K concurrent users]
- [Metric 3: e.g., Achieve 99.9% uptime]
2.4 Stakeholders
| Stakeholder | Role | Interest |
|---|---|---|
| [Name/Team] | [Role] | [What they care about] |
3. Requirements
3.1 Functional Requirements
| ID | Requirement | Priority |
|---|---|---|
| FR-001 | [Requirement description] | High/Medium/Low |
| FR-002 | [Requirement description] | High/Medium/Low |
3.2 Non-Functional Requirements
See Section 11 for detailed NFRs.
Summary of key NFRs:
- Performance: [Key performance requirements]
- Scalability: [Scalability requirements]
- Availability: [Availability requirements]
- Security: [Security requirements]
3.3 User Stories
[Link to user stories or summarize key user journeys]
4. Constraints & Assumptions
4.1 Constraints
[Things that limit or restrict the solution]
Technical Constraints:
- [e.g., Must use existing SQL database]
- [e.g., Must integrate with legacy system X]
Business Constraints:
- [e.g., Go-live date of Q2 2025]
- [e.g., Budget of $X]
Regulatory/Compliance Constraints:
- [e.g., Must comply with GDPR]
- [e.g., Must achieve SOC 2 Type II certification]
4.2 Assumptions
[Things assumed to be true but not yet validated]
- [Assumption 1]
- [Assumption 2]
- [Assumption 3]
4.3 Dependencies
[External dependencies this solution relies on]
| Dependency | Owner | Status | Impact if Not Available |
|---|---|---|---|
| [System/Service] | [Team] | [Status] | [Impact] |
5. Architecture Overview
5.1 Architecture Principles Applied
[Which of our architecture principles are most relevant? See Architecture Principles]
- [Principle 1: e.g., API-First Design]
- [Principle 2: e.g., Cloud-Native]
- [Principle 3: e.g., Security by Design]
5.2 System Context Diagram
[C4 Level 1: System Context - shows the system in its environment]
Key Elements:
- Users: [Describe user types]
- External Systems: [List and describe external integrations]
- System Boundary: [What’s inside vs outside the system]
5.3 High-Level Architecture
[C4 Level 2: Container Diagram - shows major components and technologies]
Key Components:
5.4 Architecture Patterns
[Which patterns are used and why?]
- [Pattern 1]: [e.g., Microservices - Why: Need independent scaling and deployment]
- [Pattern 2]: [e.g., Event-Driven - Why: Loose coupling and async processing]
- [Pattern 3]: [e.g., API Gateway - Why: Centralized routing and security]
6. Detailed Design
6.1 Component Architecture
[C4 Level 3: Component Diagrams for key containers]
6.1.1 [Component Name]
Responsibilities:
- [Responsibility 1]
- [Responsibility 2]
Key Classes/Modules:
Interfaces:
[Repeat for each major component]
6.2 Key Workflows
6.2.1 [Workflow Name]
[Describe the key user/system workflows]
Sequence Diagram:
Steps:
- [Step 1]
- [Step 2]
- [Step 3]
Error Handling:
- [Error scenario 1 and handling]
- [Error scenario 2 and handling]
[Repeat for each key workflow]
6.3 Technology Stack
| Layer | Technology | Justification |
|---|---|---|
| Frontend | [e.g., React] | [Why chosen] |
| API | [e.g., Node.js/Express] | [Why chosen] |
| Backend | [e.g., Java/Spring Boot] | [Why chosen] |
| Database | [e.g., PostgreSQL] | [Why chosen] |
| Cache | [e.g., Redis] | [Why chosen] |
| Message Queue | [e.g., RabbitMQ] | [Why chosen] |
| Cloud Platform | [e.g., AWS] | [Why chosen] |
7. Data Architecture
7.1 Data Model
[Entity-Relationship Diagram or key entities]
Key Entities:
7.2 Data Storage
| Data Type | Storage Solution | Rationale |
|---|---|---|
| [Transactional Data] | [e.g., PostgreSQL] | [Why] |
| [Session Data] | [e.g., Redis] | [Why] |
| [Files/Objects] | [e.g., S3] | [Why] |
| [Analytics] | [e.g., Data Warehouse] | [Why] |
7.3 Data Flow
[How data moves through the system]
7.4 Data Management
Data Retention:
Backup & Recovery:
- [Backup strategy]
- [Recovery time objective (RTO)]
- [Recovery point objective (RPO)]
Data Quality:
- [Data validation approach]
- [Data cleansing approach]
8. Security Architecture
8.1 Security Principles
- [Principle 1: e.g., Zero Trust]
- [Principle 2: e.g., Defense in Depth]
- [Principle 3: e.g., Least Privilege]
8.2 Authentication & Authorization
Authentication:
- [Approach: e.g., OAuth 2.0 + OpenID Connect]
- [Identity Provider: e.g., Auth0, Okta]
Authorization:
- [Model: e.g., RBAC, ABAC]
- [Implementation approach]
8.3 Data Security
Data in Transit:
- [TLS 1.3 for all communications]
- [Certificate management approach]
Data at Rest:
- [Encryption approach: e.g., AES-256]
- [Key management: e.g., AWS KMS]
Sensitive Data:
- [PII handling]
- [Data masking approach]
- [Tokenization if applicable]
8.4 Network Security
[Network architecture and security controls]
- VPC/Network segmentation
- Firewall rules
- DMZ if applicable
- WAF configuration
8.5 Security Controls
| Control Type | Implementation | Compliance |
|---|---|---|
| [Access Control] | [How implemented] | [Standard met] |
| [Logging/Monitoring] | [How implemented] | [Standard met] |
| [Vulnerability Management] | [How implemented] | [Standard met] |
8.6 Threat Model
[Key threats and mitigations - can link to separate threat model document]
| Threat | Impact | Likelihood | Mitigation |
|---|---|---|---|
| [Threat 1] | High/Med/Low | High/Med/Low | [Mitigation] |
9. Integration Architecture
9.1 Integration Overview
[High-level integration approach]
9.2 Internal Integrations
| System | Integration Type | Protocol | Data Format |
|---|---|---|---|
| [System A] | [Sync/Async] | [REST/gRPC/Event] | [JSON/Protobuf] |
9.3 External Integrations
| External System | Purpose | Integration Type | SLA | Error Handling |
|---|---|---|---|---|
| [System X] | [Purpose] | [API/Event/etc] | [SLA] | [Approach] |
9.4 API Design
API Standards:
- [REST, GraphQL, gRPC - which and why]
- [Versioning approach]
- [Authentication/Authorization]
Key APIs:
API Documentation:
- [Link to OpenAPI/Swagger docs]
9.5 Event Architecture
[If event-driven]
Event Broker:
- [Technology: e.g., Kafka, EventBridge, RabbitMQ]
Key Events: | Event | Producer | Consumers | Schema | |——-|———-|———–|——–| | [Event Name] | [Service] | [Services] | [Link or description] |
Event Standards:
- [Naming conventions]
- [Schema versioning]
- [Event envelope format]
10. Infrastructure & Deployment
10.1 Infrastructure Architecture
[Infrastructure diagram showing deployment topology]
10.2 Cloud Architecture
Cloud Provider: [AWS/Azure/GCP]
Key Services Used:
Multi-Region/Multi-AZ:
- [Approach and rationale]
10.3 Deployment Architecture
Deployment Model:
- [Containers, VMs, Serverless, etc.]
Orchestration:
- [Kubernetes, ECS, Lambda, etc.]
Environments: | Environment | Purpose | Infrastructure | |————-|———|—————-| | Development | [Purpose] | [Configuration] | | Staging | [Purpose] | [Configuration] | | Production | [Purpose] | [Configuration] |
10.4 CI/CD Pipeline
Build & Deploy Process:
- [Step 1: e.g., Code commit triggers build]
- [Step 2: e.g., Automated tests run]
- [Step 3: e.g., Security scanning]
- [Step 4: e.g., Deploy to staging]
- [Step 5: e.g., Deploy to production]
Tools:
- [CI/CD Platform: e.g., Jenkins, GitLab CI, GitHub Actions]
- [Container Registry]
- [Artifact Repository]
Deployment Strategy:
- [Blue/Green, Canary, Rolling Update]
- [Rollback procedure]
10.5 Infrastructure as Code
IaC Tool: [Terraform, CloudFormation, ARM, etc.]
Repository: [Link to IaC repository]
Key Resources:
- [Resource 1]
- [Resource 2]
11. Non-Functional Requirements
11.1 Performance
| Metric | Requirement | Measurement Method |
|---|---|---|
| Response Time (p95) | < [X]ms | [How measured] |
| Throughput | [X] requests/sec | [How measured] |
| Database Query Time | < [X]ms | [How measured] |
Performance Testing:
- [Load testing approach]
- [Performance benchmarks]
11.2 Scalability
Horizontal Scalability:
- [Components that scale horizontally]
- [Auto-scaling triggers and thresholds]
Vertical Scalability:
- [Components that scale vertically]
- [Scaling limits]
Growth Projections:
- Year 1: [Expected load]
- Year 2: [Expected load]
- Year 3: [Expected load]
11.3 Availability
Target: [e.g., 99.9% uptime = ~8.76 hours downtime/year]
Approach:
- [Multi-AZ deployment]
- [Redundancy approach]
- [Failover strategy]
Maintenance Windows:
- [When and how handled]
11.4 Reliability
MTBF (Mean Time Between Failures): [Target]
MTTR (Mean Time To Recovery): [Target]
Fault Tolerance:
- [How system handles failures]
- [Circuit breakers]
- [Retry logic]
- [Graceful degradation]
11.5 Disaster Recovery
RTO (Recovery Time Objective): [e.g., 4 hours]
RPO (Recovery Point Objective): [e.g., 1 hour]
DR Strategy:
- [Backup approach]
- [Recovery procedures]
- [DR testing frequency]
11.6 Observability
Monitoring:
- [Monitoring solution: e.g., Datadog, New Relic, CloudWatch]
- [Key metrics monitored]
- [Alerting strategy]
Logging:
- [Logging solution: e.g., ELK, Splunk, CloudWatch Logs]
- [Log retention]
- [Log aggregation approach]
Tracing:
- [Distributed tracing solution: e.g., Jaeger, X-Ray]
- [Trace sampling strategy]
Dashboards:
- [Business metrics dashboard]
- [Technical metrics dashboard]
- [SLA monitoring dashboard]
11.7 Maintainability
Code Quality:
- [Code review process]
- [Static analysis tools]
- [Test coverage target: e.g., 80%]
Documentation:
- [Architecture documentation (this doc)]
- [API documentation]
- [Runbooks]
- [Developer guides]
Technical Debt:
- [How tracked and managed]
11.8 Compliance & Regulatory
Applicable Regulations:
- [e.g., GDPR, HIPAA, PCI DSS, SOC 2]
Compliance Controls: | Requirement | Control | Implementation | |————-|———|—————-| | [Requirement] | [Control] | [How implemented] |
Audit Requirements:
- [Audit logging]
- [Compliance reporting]
12. Architecture Decisions
[Link to detailed ADRs or summarize key decisions]
12.1 Key Architecture Decision Records
| ADR # | Title | Status | Date |
|---|---|---|---|
| ADR-001 | [Decision Title] | Accepted | YYYY-MM-DD |
| ADR-002 | [Decision Title] | Accepted | YYYY-MM-DD |
Links:
12.2 Trade-offs & Alternatives
[Major trade-offs made and alternatives considered]
Trade-off 1: [Description]
- Chosen: [Option chosen]
- Alternative: [Alternative option]
- Rationale: [Why chosen option selected]
13. Risks & Mitigation
| Risk | Impact | Probability | Mitigation | Owner |
|---|---|---|---|---|
| [Risk 1] | High/Med/Low | High/Med/Low | [Mitigation strategy] | [Name] |
| [Risk 2] | High/Med/Low | High/Med/Low | [Mitigation strategy] | [Name] |
Technical Risks:
- [Risk and mitigation]
Dependencies:
- [Risk and mitigation]
Skills/Resources:
- [Risk and mitigation]
Third-Party/Vendor:
- [Risk and mitigation]
14. Implementation Plan
14.1 Phases
Phase 1: [Phase Name] (Timeline: [Duration])
- [Objective]
- [Key deliverables]
- [Success criteria]
Phase 2: [Phase Name] (Timeline: [Duration])
- [Objective]
- [Key deliverables]
- [Success criteria]
Phase 3: [Phase Name] (Timeline: [Duration])
- [Objective]
- [Key deliverables]
- [Success criteria]
14.2 Milestones
| Milestone | Target Date | Dependencies | Status |
|---|---|---|---|
| [Milestone 1] | YYYY-MM-DD | [Dependencies] | [Status] |
| [Milestone 2] | YYYY-MM-DD | [Dependencies] | [Status] |
14.3 Team Structure
| Role | Name/Team | Responsibility |
|---|---|---|
| Architect | [Name] | [Responsibility] |
| Tech Lead | [Name] | [Responsibility] |
| Development Team | [Team] | [Responsibility] |
14.4 Success Criteria
[How will we know the implementation is successful?]
- [Criterion 1]
- [Criterion 2]
- [Criterion 3]
15. Appendices
Appendix A: Glossary
[Terms and definitions]
Appendix B: References
- [Document/Link 1]
- [Document/Link 2]
Appendix C: Diagrams
[Additional diagrams if not included inline]
Appendix D: API Specifications
[Link to detailed API specs or include summary]
Appendix E: Database Schema
[Link to detailed schema or include DDL]
Review & Approval
| Reviewer | Role | Date | Approval |
|---|---|---|---|
| [Name] | [Role] | YYYY-MM-DD | ✅ / ⏳ |
| [Name] | [Role] | YYYY-MM-DD | ✅ / ⏳ |
Approval:
- Architecture Review Board
- Security Team
- Engineering Leadership
- Product Owner
Document Status: [Draft | Approved | Superseded]
Next Review Date: [YYYY-MM-DD]
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