Specimen VI · 04
ByteByteGo
freemium
Alex Xu's visual system design content
YouTube channel + newsletter fully free — top free system-design content in 2026. Paid courses optional.
| Habitat | Interview prep |
| Access tier | freemium |
| Relevance to stack | medium |
| Last active signal | 2026-06 AI Engineering + Claude Code cohorts |
| Verified alive | yes — pressed 2026 |
| Specimen no. | VI · 04 |
| Live habitat | https://bytebytego.com |