# system-design

Skill · `skill:system-design`

Favz census, built 2026-10-04. Tool names and counts only. No repo names. HTML page: https://favz.co/tools/skill-system-design.html

- Repos that have it now: 25
- Repos that ever had it: 32
- Still have it: 78%
- Share of census repos with any tool: 0.03%

## Repos with it, by month

From commit dates in each repo's history. The last few days always look low, because repos found later fill them in.

| Month | Repos at month end |
|---|---|
| 2026-01 | 1 |
| 2026-02 | 2 |
| 2026-03 | 4 |
| 2026-04 | 8 |
| 2026-05 | 12 |
| 2026-06 | 16 |
| 2026-07 | 21 |
| 2026-08 | 22 |
| 2026-09 | 25 |

## Goes with

Tools found in the same repos, ranked by lift: 3× means the two show up together three times as often as chance would give. Only pairs sharing 5 or more repos.

| Tool | Kind | Repos with both | Lift |
|---|---|---|---|
| [deploy-checklist](https://favz.co/tools/skill-deploy-checklist.md) | Skill | 5 | 860.2× |
| [testing-strategy](https://favz.co/tools/skill-testing-strategy.md) | Skill | 6 | 483.2× |
| [documentation](https://favz.co/tools/skill-documentation.md) | Skill | 7 | 181.5× |
| [architecture](https://favz.co/tools/skill-architecture.md) | Skill | 6 | 87.3× |
| [debug](https://favz.co/tools/skill-debug.md) | Skill | 5 | 64.6× |
| [code-review](https://favz.co/tools/skill-code-review.md) | Skill | 8 | 23.0× |
| [tdd](https://favz.co/tools/skill-tdd.md) | Skill | 5 | 21.3× |
| [frontend-design](https://favz.co/tools/skill-frontend-design.md) | Skill | 6 | 12.8× |