The Software Development Lifecycle (SDLC)

Every app goes through stages from idea to reality. Understanding this helps you plan better projects.

With vibe coding, AI accelerates certain stages—but the lifecycle still exists.

The Traditional 7 Phases

1. Planning

What: Define what you’re building and why.

What problem does this solve?
Who is it for?
What are the must-have features?
What’s the timeline?

Vibe coding impact: This phase is STILL on you. AI can’t read your mind about what you want.

2. Requirements Analysis

What: Get specific about features and needs.

List every feature in detail
Identify who the users are
Determine what data you need
Plan for edge cases

Vibe coding tip: Write these out before prompting AI. Better requirements = better results.

3. Design

What: Create the blueprint before building.

User interface mockups
Database structure
System architecture
User flow diagrams

Vibe coding impact: AI handles much of this automatically, but sketching your UI on paper first helps.

4. Development

What: Actually write the code.

Vibe coding impact: This is where AI shines. Describe features → AI generates code.

5. Testing

What: Find and fix bugs.

Does it work as expected?
What happens with weird inputs?
Is it secure?
Does it perform well?

Vibe coding impact: You still need to test! AI makes mistakes. Click everything. Try to break it.

6. Deployment

What: Make it live for users.

Push to production servers
Configure domains
Set up monitoring

Vibe coding impact: Platforms like Vercel make this nearly automatic.

7. Maintenance

What: Keep it running and improve it.

Fix bugs that users find
Add new features
Update dependencies
Monitor performance

Vibe coding impact: Same iterative process—describe fixes, AI implements.

Traditional vs Vibe Coding Timeline


TRADITIONAL DEVELOPMENT
┌─────────────────────────────────────────────────────────────────┐
│ Planning │ Requirements │ Design │ Development │ Testing │ Deploy
│  2 weeks │   2 weeks    │ 2 weeks│   8 weeks   │ 2 weeks │ 1 week
└─────────────────────────────────────────────────────────────────┘
                    Total: ~4 months

VIBE CODING
┌─────────────────────────────────────────────────────────────────┐
│ Planning │ Prompt + Generate │ Test + Iterate │ Deploy │
│  1 week  │      2-3 days     │    2-3 days    │ 1 day  │
└─────────────────────────────────────────────────────────────────┘
                    Total: ~2 weeks

Where’s the time savings?

Design + Development compressed into “Prompt + Generate”
Testing and iteration happen in tight loops, not separate phases

Your Phase Focus as a Vibe Coder

Phase	Your Involvement	AI’s Involvement
Planning	HIGH	None
Requirements	HIGH	Can help organize
Design	Medium	HIGH
Development	Low (prompt writing)	HIGH
Testing	HIGH	Can suggest tests
Deployment	Low	HIGH (automated)
Maintenance	Medium	HIGH

Key insight: AI accelerates building, but you’re still responsible for knowing what to build and verifying it works.

The Vibe Coding Loop

Instead of linear phases, vibe coding often looks like this:


         ┌──────────────┐
         │   DESCRIBE   │
         │  what you    │
         │    want      │
         └──────┬───────┘
                │
                ▼
         ┌──────────────┐
         │   GENERATE   │
         │   AI writes  │
         │    code      │
         └──────┬───────┘
                │
                ▼
         ┌──────────────┐
         │    TEST      │
         │  does it     │
         │   work?      │
         └──────┬───────┘
                │
        ┌───────┴───────┐
        │               │
        ▼               ▼
    ┌───────┐      ┌─────────┐
    │  YES  │      │   NO    │
    │ SHIP! │      │ ITERATE │
    └───────┘      └────┬────┘
                        │
                        └───────┐
                                │
                                ▼
                        (back to DESCRIBE)

Planning Documents That Help

Even with AI, these documents save time:

1. Feature List


Must Have:
- User login
- Create tasks
- Mark complete

Nice to Have:
- Dark mode
- Notifications
- Calendar view

2. User Stories


As a [user], I want to [action], so that [benefit].

Example:
As a busy professional, I want to create tasks with due dates, 
so that I don't forget important deadlines.

3. Simple Wireframes

Even hand-drawn sketches help AI understand layout:


┌─────────────────────────────┐
│    LOGO        [Menu] [👤] │
├─────────────────────────────┤
│                             │
│    Welcome, User!           │
│                             │
│    ┌─────────────────────┐  │
│    │ Task 1      [ ✓ ]   │  │
│    │ Task 2      [   ]   │  │
│    │ Task 3      [   ]   │  │
│    └─────────────────────┘  │
│                             │
│    [+ Add Task]             │
└─────────────────────────────┘

Next Steps

→ Security Basics — Protect your app and users
→ AI-Powered IDEs — Pick your build tool