2nd/10_Wiki/Topics/Coding/Quality_Pair_Programming.md

---
id: quality-pair-programming
title: Pair Programming — Driver / Navigator / Remote
category: Coding
status: draft
source_trust_level: B
verification_status: conceptual
created_at: 2026-05-09
updated_at: 2026-05-09
tags: [quality, pair-programming, vibe-coding]
tech_stack: { language: "Process", applicable_to: ["Engineering"] }
applied_in: []
aliases: [pair programming, mob programming, ensemble, driver navigator, pairing tools]
---

# Pair Programming

> 둘이 한 keyboard. **Code quality + knowledge transfer + 학습**. Driver/Navigator + remote (VSCode Live Share / Tuple). 큰 / 복잡 / 새 영역 효과적.

## 📖 핵심 개념
- Driver: 키보드 + 작은 step.
- Navigator: 큰 그림 + review.
- Swap: 매 15-20 min.
- Mob: 3+ 명 (Ensemble).

## 💻 코드 패턴

### 시작 ritual
```
1. 목표 합의 ("왜 pair?")
2. Time box (1-2 hour)
3. Driver 정함
4. 시작
```

### Driver / Navigator 책임
```
Driver:
- 입력 (keyboard)
- Implementation 의 작은 step
- Naming / 작은 결정

Navigator:
- 다음 step 생각
- "여기서 X 가 빠짐"
- Edge case 발견
- Quality / pattern
```

### Strong-style pairing (Llewellyn Falco)
```
"For the idea to go from your head into the keyboard,
it must go through someone else's hands."

Navigator 가 의도 → Driver 가 implement.
역할 swap 없이.

→ Pure transfer.
```

### Ping-pong (TDD)
```
1. A: red test
2. B: green code
3. B: red test
4. A: green code
...

→ TDD + pair.
   둘 다 active engagement.
```

### Swap rate
```
15-20 min: 일반.
5 min: rapid (작은 task).
30+ min: 1 명 dominant — bad.

→ Pomodoro 같은 timer.
```

### Mob programming (3+ 명)
```
1 keyboard, 모두 watching.
매 5-10 min driver swap.
Whole team learning.

→ 주로 1 day / week.
```

### When to pair
```
✅ 새 feature design
✅ 복잡 bug
✅ Junior onboarding
✅ Production 위험 변경
✅ 새 기술 학습
✅ Critical refactor

❌ 단순 작업
❌ 둘 다 모름
❌ 둘 다 피곤
❌ Personality conflict
```

### Remote pair tools
```
1. VS Code Live Share — built-in
2. Tuple — Mac, low-latency
3. Pop / CodeTogether
4. Jetbrains Code With Me
5. Zoom screen share + voice (basic)
```

### VS Code Live Share
```
Host:
- Cmd+Shift+P → "Live Share: Start"
- Share link

Guest:
- Click link
- Same files / cursor / debug

→ Free + 통합.
```

### Tuple (Mac, paid, best UX)
```
- Low-latency screen
- Both keyboards
- Voice clear
- "Shoulder tap"

→ Real-time pair feel.
```

### Audio quality (critical)
```
- Mic 좋음 + headphone (echo cancel)
- 조용한 환경
- Voice clear

→ Cheap mic = friction.
```

### Etiquette
```
1. Listening over talking
2. "Yes and..." over "no"
3. Frequent driver swap
4. Break (Pomodoro)
5. 한 명 dominate X
6. Personal preference 의견 X (fact / pattern)
```

### When pair fails
```
신호:
- 한 명 만 talk
- Silence (장시간)
- Frustration
- "Just let me do it"

해결:
- Take break
- Reset goal
- Try strong-style
- 또는 split + sync later
```

### Pair fatigue
```
Pair = 정신 강도 높음.
2-4 hour / day max.

→ Solo time + pair time mix.
```

### Junior + Senior pair
```
Junior driver = 학습.
Senior 가 patient — guide question.

"What if X?"
"What error case 가 있을까?"

→ 답 X — 질문.
```

### Junior + Junior pair
```
둘 다 새 시도 — 위험.

해결:
- Senior available (ask)
- 작은 task
- Frequent commit + review
```

### Senior + Senior pair
```
복잡 / critical task.
빠른 상호 review.
큰 architectural decision.

→ Most efficient pair.
```

### Pair vs solo
```
Pair:
+ Quality (built-in review)
+ Knowledge sharing
+ 학습
- 2x time (단순 task)
- Energy intensive

Solo:
+ Deep focus
+ Faster (단순)
- Knowledge silo
- No real-time review
```

→ Mix.

### Hybrid: pair design + solo implement
```
30 min pair: design + interface.
2 hour solo: implementation.
30 min pair: review + integrate.

→ Pair 의 가치 + solo 의 효율.
```

### Code review vs pair
```
Pair: real-time, learn together.
Review: async, 더 깊은 think.

→ 다른 가치. 둘 다.
```

### Mob programming benefit
```
- 모두 학습
- 모두 ownership
- Knowledge sharing 강
- Bus factor 0

비용:
- 5 명 × 4 hour = 20 hour
- Single output
```

→ 학습 prioritize 시 가치.

### Ensemble (modern mob)
```
모든 팀이 1 task on 1 keyboard.
"Driver doesn't think, navigator doesn't type."
Swap 매 4 min.

→ Woody Zuill 가 popularize.
   매일 / 매주 1 day.
```

### Pair manifesto / norms
```
1. We commit to pair (둘 다 attention)
2. We keep it small (작은 step)
3. We rotate driver (15-20 min)
4. We respectful disagree
5. We celebrate solutions
```

→ Team agreement.

### Async pair (timezones)
```
Code share + comment / video:
- 1 person 가 work + record
- 2 person 가 watch + comment
- Sync briefly daily

→ Imperfect but possible.
```

### Track pair time
```
- Whose pair? (week 별)
- 어떤 task?
- 효과?

→ 정기 retro.
```

### Pair 가 productivity (debate)
```
Pair:
+ Output 가 less than 2x BUT
+ Quality higher
+ Learning faster
+ Bus factor lower
+ Less rework

→ Long-term productivity ↑.
```

### Pair onboarding (new hire)
```
Week 1: Pair with senior (mentor)
Week 2: Pair with peer
Week 3+: Mostly solo + occasional pair

→ Strong onboarding.
```

### Tools for pair-friendly
```
- Conventional naming (모두 이해)
- Comments (즉시 context)
- Small commits (clear progress)
- Test first (shared understanding)
- Monorepo (open code)
```

### Anti-pattern: silent pair
```
"같이 앉아있지만 묵묵부답"
= solo + 추가 person.

해결:
- 매 5 min "what are you thinking?"
- Strong-style force conversation
- Frequent swap
```

## 🤔 의사결정 기준
| 상황 | 추천 |
|---|---|
| Junior onboarding | Pair (senior + junior) |
| 복잡 bug | Pair |
| 새 feature design | Pair (또는 mob) |
| 단순 작업 | Solo |
| 큰 architecture | Mob |
| Critical security | Pair |
| Quick prototype | Solo |

## ❌ 안티패턴
- **한 명 dominate (90% time driver)**: 다른 사람 학습 X.
- **No swap**: fatigue + 한 perspective.
- **Silent pair**: solo + person.
- **Audio bad**: friction.
- **All-day pair**: burnout. 2-4 hour max.
- **Strong personality 매 day pair**: clash.
- **Pair 의 metric (output, line)**: 의미 없음.

## 🤖 LLM 활용 힌트
- 새 기술 / 복잡 = pair.
- 매 15-20 min swap.
- Tuple / Live Share remote.
- Strong-style 가 powerful.

## 🔗 관련 문서
- [[Quality_Mentoring]]
- [[Productivity_Code_Review]]
- [[Quality_Refactoring]]