|
| 1 | +--- |
| 2 | +layout: post |
| 3 | +title: "Can One Person Really Develop Entire Projects? 200% AI Utilization with CDK + Lambda + Cursor" |
| 4 | +date: 2025-07-04 00:02:00 +0900 |
| 5 | +categories: [Development, AI] |
| 6 | +tags: [CDK, Lambda, Cursor, AI-Development, Monorepo, Fullstack, Development-Productivity] |
| 7 | +author: "Kevin Park" |
| 8 | +lang: en |
| 9 | +excerpt: "From the old days of creating separate repositories for each Lambda function to developing entire projects solo with CDK + Lambda + Cursor - a journey of AI-powered development" |
| 10 | +image: "/assets/images/posts/fullstack-ai-development/hero.png" |
| 11 | +--- |
| 12 | + |
| 13 | +# Can One Person Really Develop Entire Projects? 200% AI Utilization with CDK + Lambda + Cursor |
| 14 | + |
| 15 | + |
| 16 | +*Development environment managing everything from infrastructure to frontend with monorepo structure* |
| 17 | + |
| 18 | +## 🤦♂️ How I Used to Develop in the Past |
| 19 | + |
| 20 | +**Problem**: Creating one repository per Lambda function |
| 21 | +- 10 projects = 10 repositories |
| 22 | +- Copy-paste hell for common code |
| 23 | +- Jumping between 10 repositories every deployment |
| 24 | + |
| 25 | +**Current**: Managing everything in one project with CDK + Lambda + Cursor |
| 26 | +- IaC code, server code, frontend code, demo pages all in one place |
| 27 | +- AI understands the entire context and assists development |
| 28 | +- One person can develop entire projects |
| 29 | + |
| 30 | +```javascript |
| 31 | +// Now managing everything in one project like this |
| 32 | +project/ |
| 33 | +├── infrastructure/ # CDK code |
| 34 | +├── lambda-functions/ # Server logic |
| 35 | +├── frontend/ # Frontend |
| 36 | +├── demo-pages/ # Demo pages |
| 37 | +└── docs/ # Rulebook and guides |
| 38 | +``` |
| 39 | + |
| 40 | +## 🚀 The Magic of Simultaneous Development Speed and Maintainability Improvement |
| 41 | + |
| 42 | +### 200% Development Speed Improvement |
| 43 | +**The Power of AI Context Sharing** |
| 44 | +- Cursor understands the entire project structure |
| 45 | +- Auto-generates server code by looking at infrastructure code |
| 46 | +- Auto-generates frontend integration code by looking at server API |
| 47 | +- Quickly adds new features with consistent patterns |
| 48 | + |
| 49 | +**Real Experience**: Adding one new API |
| 50 | +1. Define Lambda function in CDK (30 seconds) |
| 51 | +2. Cursor generates server code based on existing patterns (1 minute) |
| 52 | +3. Auto-generates frontend integration code (1 minute) |
| 53 | +4. Deployment script follows existing patterns (30 seconds) |
| 54 | + |
| 55 | +**Total: 3 minutes**. Used to take at least 30 minutes before. |
| 56 | + |
| 57 | +### Dramatically Improved Maintainability |
| 58 | +**Code Consistency Assurance** |
| 59 | +```typescript |
| 60 | +// All Lambda functions use the same pattern |
| 61 | +export const handler = async (event: APIGatewayProxyEvent) => { |
| 62 | + try { |
| 63 | + // Apply common middleware |
| 64 | + const result = await processRequest(event); |
| 65 | + return successResponse(result); |
| 66 | + } catch (error) { |
| 67 | + return errorResponse(error); |
| 68 | + } |
| 69 | +}; |
| 70 | +``` |
| 71 | + |
| 72 | +**Simplified Version Control** |
| 73 | +- Track all changes in one repository |
| 74 | +- Component-based folder structure instead of feature-based branches |
| 75 | +- Deployment can be done all at once or selectively |
| 76 | + |
| 77 | +## 💡 But There Were These Challenges Too |
| 78 | + |
| 79 | +### Biggest Challenge: Rulebook Management |
| 80 | +**The Trap of Massive Source Code** |
| 81 | +- Too complex for AI to understand the entire project |
| 82 | +- AI repeating past trial-and-error mistakes |
| 83 | +- Inconsistent code patterns confusing AI |
| 84 | + |
| 85 | +**Solution: Systematic Rulebook Creation** |
| 86 | +```markdown |
| 87 | +# Project Rulebook (docs/rulebook.md) |
| 88 | + |
| 89 | +## 1. Lambda Function Writing Rules |
| 90 | +- All functions use common/middleware.ts |
| 91 | +- Error handling uses standardError class |
| 92 | +- Environment variables managed in config/environment.ts |
| 93 | + |
| 94 | +## 2. CDK Infrastructure Patterns |
| 95 | +- Lambda functions use constructs/lambda-construct.ts |
| 96 | +- API Gateway paths unified in kebab-case |
| 97 | +- Project tags mandatory for all resources |
| 98 | + |
| 99 | +## 3. Prohibited Actions |
| 100 | +- Direct AWS SDK calls prohibited (use wrapper functions) |
| 101 | +- Hardcoded ARNs prohibited (use CDK references) |
| 102 | +- Use structured logging instead of console.log |
| 103 | +``` |
| 104 | + |
| 105 | +When this rulebook is properly recognized by Cursor, AI develops with consistent patterns. |
| 106 | + |
| 107 | +## 🎯 Now One Person Can Handle Entire Projects |
| 108 | + |
| 109 | +### Benefits of MSA Design + Monorepo Management |
| 110 | +**Separated Design, Integrated Management** |
| 111 | + |
| 112 | +| Category | Old Method | Current Method | |
| 113 | +|----------|------------|----------------| |
| 114 | +| Repository | Function-based separation | Project integration | |
| 115 | +| Deployment | Individual deployment | Selective batch deployment | |
| 116 | +| Code Reuse | Copy-paste | Common modules | |
| 117 | +| AI Utilization | Limited | Full context | |
| 118 | +| Development Speed | Slow | Fast | |
| 119 | + |
| 120 | +### Actual Project Structure |
| 121 | +``` |
| 122 | +my-fullstack-project/ |
| 123 | +├── cdk/ |
| 124 | +│ ├── lib/ |
| 125 | +│ │ ├── api-stack.ts # API Gateway + Lambda |
| 126 | +│ │ ├── frontend-stack.ts # S3 + CloudFront |
| 127 | +│ │ └── database-stack.ts # DynamoDB |
| 128 | +│ └── bin/app.ts |
| 129 | +├── lambdas/ |
| 130 | +│ ├── user-service/ |
| 131 | +│ ├── auth-service/ |
| 132 | +│ └── common/ # Common utilities |
| 133 | +├── frontend/ |
| 134 | +│ ├── src/ |
| 135 | +│ └── dist/ |
| 136 | +├── demo/ |
| 137 | +│ └── landing-page/ |
| 138 | +└── docs/ |
| 139 | + ├── rulebook.md # Rulebook for AI |
| 140 | + └── architecture.md |
| 141 | +``` |
| 142 | + |
| 143 | +## 🔧 Development Workflow with Cursor |
| 144 | + |
| 145 | +### Process of Adding New Features |
| 146 | +1. **Requirements Definition** (1 minute) |
| 147 | + - "Create user profile lookup API" |
| 148 | + |
| 149 | +2. **Cursor Auto-generates** (2 minutes) |
| 150 | + - Add Lambda function to CDK stack |
| 151 | + - Implement Lambda function (based on rulebook) |
| 152 | + - Generate frontend integration code |
| 153 | + |
| 154 | +3. **Deploy and Test** (2 minutes) |
| 155 | + - `npm run deploy` |
| 156 | + - Test immediately on demo page |
| 157 | + |
| 158 | +**Total: 5 minutes**. This is the power of 200% AI utilization. |
| 159 | + |
| 160 | +### Token Consumption Optimization Tips |
| 161 | +**What I Learned Using Ultra Version** |
| 162 | +- Well-made rulebook prevents AI from wandering |
| 163 | +- Include only relevant files in context window |
| 164 | +- Register frequently used patterns as snippets |
| 165 | + |
| 166 | +```typescript |
| 167 | +// Register frequently used Lambda function template as snippet |
| 168 | +const lambdaTemplate = ` |
| 169 | +export const handler = async (event: APIGatewayProxyEvent) => { |
| 170 | + // Standard pattern based on rulebook |
| 171 | +}; |
| 172 | +`; |
| 173 | +``` |
| 174 | + |
| 175 | +## 💡 Conclusion: Solo Fullstack Development Became Reality |
| 176 | + |
| 177 | +**Summary of Benefits** |
| 178 | +- 200% development speed improvement |
| 179 | +- Dramatically improved maintainability |
| 180 | +- Consistent code quality through AI context sharing |
| 181 | +- One person can develop entire projects |
| 182 | + |
| 183 | +**Precautions** |
| 184 | +- Rulebook management is key |
| 185 | +- Initial structure design requires time investment |
| 186 | +- Consider token consumption (Ultra version recommended) |
| 187 | + |
| 188 | +Developing this way really makes a difference in productivity. I'm curious about how others with similar experiences manage their projects! |
| 189 | + |
| 190 | +If you have better tips, please share them in the comments 🙏 |
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