@matz
0 following
Every leaf is a headline number from Yukihiro "Matz" Matsumoto’s public GitHub. The canopy fills out as the work grows - sway and all.
Data from GitHub API · refreshed in real time
Based on public GitHub activity · how this is calculated
C is the largest language share across analyzed repositories, at 69%.
High confidence
Public visibility is concentrated: the top 3 analyzed repositories account for 100% of total stars, led by streem.
Medium confidence
Public GitHub activity is implementation-heavy: commits account for 99% of tracked contribution activity.
Medium confidence
2 of 3 analyzed repositories were pushed to in the last 6 months.
Medium confidence
Signals from analyzed public data
Strong
Developing
Needs work
Developing
Needs work
A skim of public evidence, not a hiring judgement
Largest language shares across analyzed repositories
Analyzed repositories rated established or maintained
Public pull requests and code reviews in the trailing year
Summed across analyzed repositories
Calendar months with at least one tracked contribution
Strongest signals
Yukihiro "Matz" Matsumoto is a developer on GitHub whose public work is written mostly in C, which accounts for roughly 69% of their committed code, alongside Ruby and C++. Their account holds 3 public repositories, collecting 6,478 stars in total, led by streem at 4,595. In the trailing year the account logged 9,009 contributions, including a longest run of 369 consecutive active days. Yukihiro "Matz" Matsumoto has been on GitHub since 2008 and is followed by 10,692 developers.
This overview is generated from Yukihiro "Matz" Matsumoto’s public GitHub activity at the time of the last refresh. Figures cover public repositories and the trailing twelve months of contributions.
Add topics to streem
Low impactstreem has no topic tags, making its technology harder to discover.
streem →Add topics to spinel
Low impactspinel has no topic tags, making its technology harder to discover.
spinel →Add topics to spin-index
Low impactspin-index has no topic tags, making its technology harder to discover.
spin-index →How these are calculated: see the methodology page .
prototype of stream based programming language
Ruby AOT compiler
The spinelgems index: a git-hosted name -> (repo, releases) map for spin (no server)
Public visibility is concentrated in a small number of projects - these are the strongest candidates to feature on a resume.
Leading repository: streem (4,595 stars, 6,478 total across analyzed repositories)
Derived from repository languages and topics - horizontal bars, never a pie.
README, contributing-guide and GitHub Actions badges below are detected by exact filename on each repository’s default branch - they report presence, not quality.
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| Name | Language | Stars | Forks | Size | Updated |
|---|
No repositories match those filters.
Best coding day: Thu
Created the @matz account.
Published streem, the oldest repository still on the account.
streem is the earliest-created repository to have earned stars.
8,533 contributions recorded in 2026, more than any other year on record.
spin-index is the most recently created repository.
Your GitHub career, year by year.
→Built from matz’s public, non-fork repositories. Star totals reflect current counts, not historical snapshots.
5 / 9 unlocked
The primary languages of repositories created each year.
Repositories created per year, and the running total.
Built automatically from repository languages and topics.