ai Andrey Sitnik
The creator of Autoprefixer, @postcss, @browserslist, and Nano ID
EVIDENCE BASE
85
Repositories
94345
Commits
15436
Files analyzed
55
Technologies
606
Evidence
212
Active months
Based on 85 repository passports · 79/85 current
ENGINEERING PROFILE
Frontend82%
Backend13%
Testing55%
DevOps72%
CORE TECHNOLOGIES
HR: name + projects · Lead: + files/LOC · persistence Core≥4
TypeScript Core
LANGUAGE · 28/85 repos · 3220 files · 319728 LOC
Depth 70 · HIGH
Markdown Core
LANGUAGE · 75/85 repos · 2863 files · 175389 LOC
Depth 70 · HIGH
JSON Core
LANGUAGE · 57/85 repos · 2373 files · 360566 LOC
Depth 70 · HIGH
Svelte Core
LANGUAGE · 8/85 repos · 1533 files · 27265 LOC
Depth 70 · HIGH
JavaScript Core
LANGUAGE · 61/85 repos · 1355 files · 130443 LOC
Depth 70 · HIGH
YAML Core
LANGUAGE · 61/85 repos · 1042 files · 98947 LOC
Depth 70 · HIGH
React Core
FRAMEWORK · 6/85 repos · 521 files · 50657 LOC
Depth 58 · HIGH
Python Emerging
LANGUAGE · 1/85 repos · 387 files · 24604 LOC
Depth 70 · HIGH
ESLint Core
QUALITY · 32/85 repos · 284 files · 139785 LOC
Depth 69 · HIGH
Django Emerging
FRAMEWORK · 1/85 repos · 280 files · 13694 LOC
Depth 100 · HIGH
Ruby Core
LANGUAGE · 12/85 repos · 140 files · 6378 LOC
Depth 70 · HIGH
Rust Emerging
LANGUAGE · 1/85 repos · 102 files · 59298 LOC
Depth 70 · HIGH
Angular Recurring
FRAMEWORK · 2/85 repos · 80 files · 6944 LOC
Depth 74 · HIGH
Next.js Core
FRAMEWORK · 5/85 repos · 73 files · 33052 LOC
Depth 58 · HIGH
Webpack Core
BUILD_TOOL · 5/85 repos · 64 files · 7465 LOC
Depth 74 · HIGH
Vue Recurring
LANGUAGE · 3/85 repos · 61 files · 3263 LOC
Depth 70 · HIGH
debug Core
LIBRARY · 5/85 repos · 49 files · 9455 LOC
Depth 58 · HIGH
npm Core
BUILD_TOOL · 48/85 repos · 48 files · 480 LOC
Depth 80 · HIGH
Spring Framework Emerging
FRAMEWORK · 1/85 repos · 44 files · 3979 LOC
Depth 74 · HIGH
Prettier Core
QUALITY · 16/85 repos · 42 files · 73855 LOC
Depth 69 · HIGH
Vite Core
BUILD_TOOL · 8/85 repos · 40 files · 2617 LOC
Jest Core
TESTING · 4/85 repos · 36 files · 7661 LOC
Depth 42 · HIGH
Vitest Recurring
TESTING · 2/85 repos · 25 files · 2965 LOC
Depth 53 · HIGH
Express Core
FRAMEWORK · 4/85 repos · 24 files · 3788 LOC
Depth 58 · HIGH
pnpm Core
BUILD_TOOL · 21/85 repos · 21 files · 210 LOC
Depth 80 · HIGH
Ruby on Rails Core
FRAMEWORK · 4/85 repos · 18 files · 496 LOC
Depth 96 · HIGH
Playwright Emerging
TESTING · 1/85 repos · 16 files · 1114 LOC
Depth 78 · HIGH
Shell Core
LANGUAGE · 9/85 repos · 16 files · 387 LOC
Depth 70 · HIGH
Yarn Core
BUILD_TOOL · 12/85 repos · 12 files · 120 LOC
Depth 80 · HIGH
Redis Core
CACHE · 5/85 repos · 12 files · 14955 LOC
Depth 53 · HIGH
Serde Emerging
LIBRARY · 1/85 repos · 10 files · 3003 LOC
Depth 81 · HIGH
Bundler Core
BUILD_TOOL · 9/85 repos · 9 files · 90 LOC
Depth 80 · HIGH
Redux Emerging
LIBRARY · 1/85 repos · 9 files · 1229 LOC
Depth 74 · HIGH
XML Core
LANGUAGE · 7/85 repos · 8 files · 339 LOC
Depth 70 · HIGH
TOML Recurring
LANGUAGE · 3/85 repos · 8 files · 150 LOC
Depth 70 · HIGH
Dockerfile Core
LANGUAGE · 6/85 repos · 7 files · 177 LOC
Depth 70 · HIGH
Zod Emerging
LIBRARY · 1/85 repos · 6 files · 947 LOC
Depth 74 · HIGH
MongoDB Recurring
DATABASE · 3/85 repos · 5 files · 1330 LOC
Depth 69 · HIGH
Lodash Recurring
LIBRARY · 2/85 repos · 5 files · 2726 LOC
Depth 70 · HIGH
PostgreSQL Emerging
DATABASE · 1/85 repos · 4 files · 314 LOC
Depth 77 · HIGH
RSpec Core
TESTING · 4/85 repos · 4 files · 77 LOC
Depth 43 · HIGH
Requests Emerging
LIBRARY · 1/85 repos · 4 files · 289 LOC
Depth 74 · HIGH
GraphQL Emerging
LIBRARY · 1/85 repos · 4 files · 492 LOC
Depth 70 · HIGH
Supertest Emerging
TESTING · 1/85 repos · 3 files · 79 LOC
Depth 66 · HIGH
RabbitMQ Emerging
MESSAGE_BROKER · 1/85 repos · 3 files · 8763 LOC
Depth 73 · HIGH
React Router Emerging
LIBRARY · 1/85 repos · 2 files · 138 LOC
Depth 62 · HIGH
body-parser Emerging
LIBRARY · 1/85 repos · 1 files · 108 LOC
Depth 58 · HIGH
Cargo Emerging
BUILD_TOOL · 1/85 repos · 1 files · 10 LOC
Depth 80 · HIGH
Morgan Emerging
OBSERVABILITY · 1/85 repos · 1 files · 17 LOC
Depth 45 · HIGH
Java Emerging
LANGUAGE · 1/85 repos · 1 files · 6 LOC
Depth 70 · HIGH
Pipenv Emerging
BUILD_TOOL · 1/85 repos · 1 files · 10 LOC
Depth 80 · HIGH
Tailwind CSS Emerging
LIBRARY · 1/85 repos · 1 files · 17 LOC
Depth 41 · HIGH
esbuild Recurring
BUILD_TOOL · 2/85 repos · 0 files · 0 LOC
Clap Emerging
LIBRARY · 1/85 repos · 0 files · 0 LOC
Mocha Core
TESTING · 8/85 repos · 0 files · 0 LOC
ENGINEERING HABITS
containerizationobserved
automated_testsobserved
documentationobserved
lintingobserved
formattingobserved
continuous_integrationobserved
Not observed ≠ does not know
PROJECT PORTFOLIO
easings.net npm
nanoid npm
visibilityjs npm
compass.js npm
size-limit npm
autoprefixer-rails Ruby on Rails
keyux npm
evolu-lang Markdown
ACTIVITY & OWNERSHIP
Active months 212
Commits 94345
Owner authored 50%
PRIMARY PROFILE — HR VIEW
FrontendTypeScript · Markdown · JSONTeam
In 30 sec: direction — frontend, core — TypeScript · Markdown · JSON, 85 repos 2008 — 2026. No LOC or files — stability only.
DEVELOPER SIGNATURE
TypeScriptMarkdownJSONSvelteJavaScriptTeam
TECHNOLOGY EVOLUTION
2023
JavaScript · React
2024
TypeScript · Next.js
2025
TypeScript · PostgreSQL
2026
TS + Next
COMMUNITY / IMPACT not a skill rating
Stars 51159
Forks 3907
Watchers 545
EVERYTHING ABOVE IS TRACEABLE
85 repositories · 94345 commits · 15436 files · 606 evidence
Absence of a technology in the passport does not imply lack of experience