keiya01 keiya sasaki
EVIDENCE BASE
50
Repositories
3543
Commits
4518
Files analyzed
44
Technologies
454
Evidence
80
Active months
Based on 50 repository passports · 41/50 current
ENGINEERING PROFILE
Frontend82%
Backend39%
Testing68%
DevOps87%
CORE TECHNOLOGIES
HR: name + projects · Lead: + files/LOC · persistence Core≥4
TypeScript Core
LANGUAGE · 26/50 repos · 1401 files · 146808 LOC
Depth 70 · HIGH
Rust Core
LANGUAGE · 8/50 repos · 625 files · 109404 LOC
Depth 70 · HIGH
Markdown Core
LANGUAGE · 36/50 repos · 448 files · 59794 LOC
Depth 70 · HIGH
JavaScript Core
LANGUAGE · 29/50 repos · 247 files · 6700 LOC
Depth 70 · HIGH
JSON Core
LANGUAGE · 32/50 repos · 199 files · 207846 LOC
Depth 70 · HIGH
React Core
FRAMEWORK · 14/50 repos · 149 files · 9381 LOC
Depth 78 · HIGH
Vitest Recurring
TESTING · 2/50 repos · 122 files · 18241 LOC
TOML Core
LANGUAGE · 8/50 repos · 94 files · 2059 LOC
Depth 70 · HIGH
ESLint Core
QUALITY · 21/50 repos · 55 files · 127735 LOC
Depth 73 · HIGH
Serde Recurring
LIBRARY · 2/50 repos · 42 files · 9401 LOC
Depth 62 · HIGH
Prettier Core
QUALITY · 12/50 repos · 40 files · 76619 LOC
Depth 65 · HIGH
Svelte Recurring
LANGUAGE · 2/50 repos · 34 files · 2004 LOC
Depth 70 · HIGH
npm Core
BUILD_TOOL · 30/50 repos · 30 files · 300 LOC
Depth 80 · HIGH
YAML Core
LANGUAGE · 15/50 repos · 28 files · 31121 LOC
Depth 70 · HIGH
Vite Core
BUILD_TOOL · 8/50 repos · 28 files · 981 LOC
Depth 51 · HIGH
Yarn Core
BUILD_TOOL · 23/50 repos · 23 files · 230 LOC
Depth 80 · HIGH
Go Emerging
LANGUAGE · 1/50 repos · 17 files · 588 LOC
Depth 70 · HIGH
React Router Recurring
LIBRARY · 3/50 repos · 15 files · 688 LOC
Depth 66 · HIGH
Redis Recurring
CACHE · 3/50 repos · 9 files · 13150 LOC
Depth 73 · HIGH
Cargo Core
BUILD_TOOL · 8/50 repos · 8 files · 80 LOC
Depth 80 · HIGH
PostgreSQL Recurring
DATABASE · 2/50 repos · 8 files · 593 LOC
Depth 62 · HIGH
pnpm Core
BUILD_TOOL · 8/50 repos · 8 files · 80 LOC
Depth 80 · HIGH
Webpack Core
BUILD_TOOL · 9/50 repos · 8 files · 382 LOC
Depth 62 · HIGH
Express Recurring
FRAMEWORK · 2/50 repos · 6 files · 239 LOC
Depth 74 · HIGH
Swift Emerging
LANGUAGE · 1/50 repos · 6 files · 136 LOC
Depth 70 · HIGH
Apache Kafka Core
MESSAGE_BROKER · 5/50 repos · 5 files · 39446 LOC
Depth 61 · HIGH
debug Emerging
LIBRARY · 1/50 repos · 4 files · 6227 LOC
Depth 74 · HIGH
Prisma Emerging
DATABASE · 1/50 repos · 3 files · 22 LOC
Depth 55 · HIGH
Redux Recurring
LIBRARY · 2/50 repos · 3 files · 53 LOC
Depth 57 · HIGH
Gorilla Mux Emerging
LIBRARY · 1/50 repos · 3 files · 253 LOC
Depth 70 · HIGH
go-playground/validator Emerging
LIBRARY · 1/50 repos · 2 files · 240 LOC
Depth 66 · HIGH
Playwright Recurring
TESTING · 2/50 repos · 2 files · 474 LOC
Tailwind CSS Recurring
LIBRARY · 2/50 repos · 2 files · 99 LOC
Depth 43 · HIGH
RabbitMQ Emerging
MESSAGE_BROKER · 1/50 repos · 2 files · 13716 LOC
Depth 69 · HIGH
Shell Emerging
LANGUAGE · 1/50 repos · 1 files · 4 LOC
Depth 70 · HIGH
body-parser Emerging
LIBRARY · 1/50 repos · 1 files · 20 LOC
Depth 46 · HIGH
Go Modules Emerging
BUILD_TOOL · 1/50 repos · 1 files · 10 LOC
Depth 80 · HIGH
Supertest Emerging
TESTING · 1/50 repos · 0 files · 0 LOC
Clap Emerging
LIBRARY · 1/50 repos · 0 files · 0 LOC
Jest Core
TESTING · 10/50 repos · 0 files · 0 LOC
Testify Emerging
TESTING · 1/50 repos · 0 files · 0 LOC
GraphQL Emerging
LIBRARY · 1/50 repos · 0 files · 0 LOC
esbuild Emerging
BUILD_TOOL · 1/50 repos · 0 files · 0 LOC
Testing Library Recurring
TESTING · 3/50 repos · 0 files · 0 LOC
ENGINEERING HABITS
containerizationobserved
automated_testsobserved
documentationobserved
lintingobserved
formattingobserved
continuous_integrationobserved
Not observed ≠ does not know
PROJECT PORTFOLIO
og_image_writer Prettier
kamaitachi Cargo
threerender Cargo
wc-ssr ESLint
three-gsmesh npm
thanks-dependencies Cargo
ACTIVITY & OWNERSHIP
Active months 80
Commits 3543
Owner authored 98%
PRIMARY PROFILE — HR VIEW
FrontendTypeScript · Rust · MarkdownHigh ownership
In 30 sec: direction — frontend, core — TypeScript · Rust · Markdown, 50 repos 2019 — 2026. No LOC or files — stability only.
DEVELOPER SIGNATURE
TypeScriptRustMarkdownJavaScriptJSONHigh ownership
TECHNOLOGY EVOLUTION
2023
JavaScript · React
2024
TypeScript · Next.js
2025
TypeScript · PostgreSQL
2026
TS + Next
COMMUNITY / IMPACT not a skill rating
Stars 430
Forks 19
Watchers 30
EVERYTHING ABOVE IS TRACEABLE
50 repositories · 3543 commits · 4518 files · 454 evidence
Absence of a technology in the passport does not imply lack of experience