System development steps and phases
Requirement
🧭 Step 1: Understand the Business and Technical Requirements
Tools
🧩 Step 2: Choose the Right .NET Application Type
🧱 Step 3: Select an Architecture Style
🧠 Step 4: Define Solution Structure (Clean Architecture Example)
⚙️ Step 5: Choose Technologies
Automations
🧰 Step 6: CI/CD with AWS DevOps
Security
🔒 Step 7: Security & Compliance
Testing
🧪 Step 8: Testing, Quality & Observability
Documentation
📘 Step 9: Documentation & Governance
Refinement
🔁 Step 10: Iterate and Improve
🧭 Step 1: Understand the Business and Technical Requirements
Before starting, gather and document:
- Functional and non-functional requirements.
- User personas, traffic expectations, and performance needs.
- Compliance, security, and availability goals.
- Integration needs with internal systems or third-party APIs.
🎯 Output: A clear understanding of system goals and constraints.
🧩 Step 2: Choose the Right .NET Application Type
| Application Type | Framework / Tech Stack | Use Case |
|---|---|---|
| Web API / Microservice | ASP.NET Core Web API | Backend REST APIs, integrations |
| Web App (UI) | ASP.NET Core MVC / Razor Pages / Blazor | Full-stack web apps |
| Background Processing | Worker Service / AWS Lambda | Jobs, scheduling, event processing |
| Desktop App | WPF / WinUI / MAUI | Desktop or cross-platform apps |
| Cloud-Native App | ASP.NET Core + Containers (Docker, ECS, EKS) | Scalable distributed systems |
🎯 Output: Application type and high-level stack selection.
🧱 Step 3: Select an Architecture Style
| Architecture | Description | Use When |
| Layered (N-tier) | Simple separation into UI, business, and data layers. | Small to medium monoliths. |
| Clean / Hexagonal / Onion | Domain-focused, testable, decoupled. | Modern enterprise solutions. |
| Microservices | Independent, API-based services. | Large, distributed applications. |
| Modular Monolith | Monolith organized into modules. | Mid-sized apps; future-ready. |
| Event-driven | Uses AWS SQS/SNS/EventBridge for async comms. | Real-time or decoupled systems. |
💡 Recommendation: Start with Clean Architecture for modularity and maintainability.
🧠 Step 4: Define Solution Structure (Clean Architecture Example)
src/
├── Presentation (API/UI)
│ └── Controllers, Views
├── Application
│ └── Business logic, CQRS, DTOs, Validation
├── Domain
│ └── Entities, Value Objects, Domain Events, Interfaces
├── Infrastructure
│ └── EF Core, AWS SDK integrations, Logging, External Services
└── Tests
└── Unit, Integration, and API tests
Dependency flow: Presentation → Application → Domain → Infrastructure (implementing domain interfaces)
⚙️ Step 5: Choose Technologies
Backend
- Framework: .NET 8 (LTS)
- API: ASP.NET Core Web API / Minimal API
- ORM: Entity Framework Core / Dapper
- Authentication: JWT, Cognito, or OAuth2
- Validation: FluentValidation
- Mapping: AutoMapper
Frontend (optional):
- React, Angular, Blazor, or Razor Pages
- Communicate via REST/gRPC
Database
- Amazon RDS (SQL Server, PostgreSQL)
- DynamoDB (NoSQL)
- EF Core Migrations for schema evolution
Caching
Amazon ElastiCache (Redis), memcache
Messaging / Events
AWS SQS, SNS, EventBridge, or Kinesis Streams
File Storage
Amazon S3
Logging & Monitoring
ILogger (built-in), Serilog, Amazon CloudWatch, X-Ray
🧰 Step 6: CI/CD with AWS DevOps
- Version control: Git (GitHub / CodeCommit)
- CI/CD: AWS CodePipeline, CodeBuild, GitHub Actions or Harness
- Stages:
- Build and test
- Static analysis (SonarQube / Checkmarx)
- Deploy to dev/test/prod
- Infrastructure as Code (IaC): AWS CloudFormation / Terraform
- Container orchestration: ECS or EKS (Kubernetes)
🔒 Step 7: Security & Compliance
- Use AWS Identity and Access Management (IAM) for roles and permissions.
- Secure secrets via AWS Secrets Manager or Parameter Store.
- Enable HTTPS using AWS Certificate Manager.
- Apply OWASP Top 10 principles and encryption at rest (KMS).
🧪 Step 8: Testing, Quality & Observability
- Testing: Unit, Integration, API, and Performance tests.
- Static Code Analysis: SonarQube / Checkmarx.
- Observability: CloudWatch, X-Ray, Serilog.
- Metrics: Track latency, throughput, and error rates.
📘 Step 9: Documentation & Governance
- Document APIs using Swagger/OpenAPI.
- Maintain Architecture Decision Records (ADRs).
- Use consistent Git branching and code review practices.
- Reassess architecture periodically for improvements.
🔁 Step 10: Iterate and Improve
- Start with MVP, evolve as usage grows.
- Review scaling patterns regularly.
- Encourage feedback and innovation from the team.
🧱 Clean Architecture Overview
+---------------------------+
| Presentation |
| (Controllers / API Layer) |
+------------+--------------+
↓
+---------------------------+
| Application |
| (Use Cases, CQRS, DTOs) |
+------------+--------------+
↓
+---------------------------+
| Domain |
| (Entities, Interfaces) |
+------------+--------------+
↓
+---------------------------+
| Infrastructure |
| (EF Core, AWS SDK, etc.) |
+---------------------------+
✅ Summary Principles
| Principle | Description |
| SOLID | Maintainable and scalable design |
| KISS & DRY | Simplicity and no duplication |
| Dependency Inversion | Depend on abstractions |
| Separation of Concerns | Isolated business logic |
| Testability | Unit and integration ready |
| Scalability & Resilience | AWS-native scaling and fault tolerance |
Outcome: A scalable, testable, and secure .NET 8 application leveraging AWS-native services for CI/CD, observability, and automation.
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