juliusmarminge Julius Marminge
🇸🇪. Founding Engineer @pingdotgg 🇺🇸, Open Source 🌍
EVIDENCE BASE
269
Repositories
6371
Commits
6659
Files analyzed
53
Technologies
2184
Evidence
65
Active months
Based on 269 repository passports · 200/269 current
ENGINEERING PROFILE
Frontend97%
Backend35%
Testing63%
DevOps98%
CORE TECHNOLOGIES
HR: name + projects · Lead: + files/LOC · persistence Core≥4
TypeScript Core
LANGUAGE · 193/269 repos · 3037 files · 167210 LOC
Depth 70 · HIGH
JSON Core
LANGUAGE · 195/269 repos · 1049 files · 162961 LOC
Depth 70 · HIGH
JavaScript Core
LANGUAGE · 134/269 repos · 604 files · 15652 LOC
Depth 70 · HIGH
React Core
FRAMEWORK · 152/269 repos · 547 files · 43983 LOC
Depth 81 · HIGH
Next.js Core
FRAMEWORK · 127/269 repos · 542 files · 26420 LOC
Depth 44 · HIGH
Markdown Core
LANGUAGE · 171/269 repos · 447 files · 24277 LOC
Depth 70 · HIGH
ESLint Core
QUALITY · 100/269 repos · 391 files · 378557 LOC
Depth 88 · HIGH
YAML Core
LANGUAGE · 136/269 repos · 285 files · 365239 LOC
Depth 70 · HIGH
Prettier Core
QUALITY · 81/269 repos · 257 files · 318772 LOC
Depth 88 · HIGH
Zod Core
LIBRARY · 80/269 repos · 213 files · 11087 LOC
Depth 78 · HIGH
npm Core
BUILD_TOOL · 194/269 repos · 194 files · 1940 LOC
Depth 80 · HIGH
pnpm Core
BUILD_TOOL · 125/269 repos · 125 files · 1250 LOC
Depth 80 · HIGH
Tailwind CSS Core
LIBRARY · 74/269 repos · 83 files · 12694 LOC
Depth 77 · HIGH
Vitest Core
TESTING · 16/269 repos · 71 files · 11209 LOC
Depth 45 · HIGH
Prisma Core
DATABASE · 29/269 repos · 49 files · 1961 LOC
Depth 43 · HIGH
Vite Core
BUILD_TOOL · 43/269 repos · 42 files · 686 LOC
Depth 66 · HIGH
PostgreSQL Core
DATABASE · 23/269 repos · 31 files · 70824 LOC
Depth 61 · HIGH
Redis Core
CACHE · 22/269 repos · 22 files · 99002 LOC
Depth 61 · HIGH
SQL Core
LANGUAGE · 6/269 repos · 21 files · 135 LOC
Depth 70 · HIGH
Vue Core
FRAMEWORK · 5/269 repos · 19 files · 3053 LOC
Depth 74 · HIGH
Playwright Core
TESTING · 8/269 repos · 18 files · 514 LOC
Depth 66 · HIGH
Python Recurring
LANGUAGE · 3/269 repos · 16 files · 1639 LOC
Depth 70 · HIGH
Svelte Core
FRAMEWORK · 4/269 repos · 12 files · 1673 LOC
Depth 70 · HIGH
MongoDB Core
DATABASE · 11/269 repos · 11 files · 45006 LOC
Depth 61 · HIGH
Express Core
FRAMEWORK · 5/269 repos · 8 files · 498 LOC
Depth 52 · HIGH
TOML Core
LANGUAGE · 8/269 repos · 8 files · 79 LOC
Depth 70 · HIGH
Shell Core
LANGUAGE · 6/269 repos · 7 files · 105 LOC
Depth 70 · HIGH
C++ Recurring
LANGUAGE · 2/269 repos · 6 files · 383 LOC
Depth 70 · HIGH
Yarn Core
BUILD_TOOL · 5/269 repos · 5 files · 50 LOC
Depth 80 · HIGH
Rust Recurring
LANGUAGE · 2/269 repos · 4 files · 112 LOC
Depth 70 · HIGH
React Router Emerging
LIBRARY · 1/269 repos · 4 files · 124 LOC
Depth 70 · HIGH
XML Emerging
LANGUAGE · 1/269 repos · 4 files · 26 LOC
Depth 70 · HIGH
FastAPI Recurring
FRAMEWORK · 3/269 repos · 4 files · 721 LOC
Depth 66 · HIGH
pip Recurring
BUILD_TOOL · 2/269 repos · 2 files · 20 LOC
Depth 80 · HIGH
Pydantic Recurring
LIBRARY · 2/269 repos · 2 files · 438 LOC
Depth 58 · HIGH
Swift Emerging
LANGUAGE · 1/269 repos · 2 files · 49 LOC
Depth 70 · HIGH
Cargo Recurring
BUILD_TOOL · 2/269 repos · 2 files · 20 LOC
Depth 80 · HIGH
debug Recurring
LIBRARY · 2/269 repos · 2 files · 29 LOC
Depth 42 · HIGH
Dockerfile Emerging
LANGUAGE · 1/269 repos · 2 files · 25 LOC
Depth 70 · HIGH
Poetry Emerging
BUILD_TOOL · 1/269 repos · 1 files · 10 LOC
Depth 80 · HIGH
C Emerging
LANGUAGE · 1/269 repos · 1 files · 257 LOC
Depth 70 · HIGH
Morgan Emerging
OBSERVABILITY · 1/269 repos · 1 files · 45 LOC
Depth 52 · HIGH
Elasticsearch Emerging
DATABASE · 1/269 repos · 1 files · 15734 LOC
Depth 61 · HIGH
pytest Emerging
TESTING · 1/269 repos · 1 files · 60 LOC
Depth 37 · HIGH
Serde Emerging
LIBRARY · 1/269 repos · 0 files · 0 LOC
Nuxt Emerging
FRAMEWORK · 1/269 repos · 0 files · 0 LOC
mypy Emerging
QUALITY · 1/269 repos · 0 files · 0 LOC
esbuild Emerging
BUILD_TOOL · 1/269 repos · 0 files · 0 LOC
Uvicorn Emerging
LIBRARY · 1/269 repos · 0 files · 0 LOC
Ruff Emerging
QUALITY · 1/269 repos · 0 files · 0 LOC
HTTPX Emerging
LIBRARY · 1/269 repos · 0 files · 0 LOC
Jest Emerging
TESTING · 1/269 repos · 0 files · 0 LOC
Testing Library Recurring
TESTING · 3/269 repos · 0 files · 0 LOC
ENGINEERING HABITS
containerizationobserved
automated_testsobserved
documentationobserved
lintingobserved
formattingobserved
continuous_integrationobserved
Not observed ≠ does not know
PROJECT PORTFOLIO
acme-corp-lib npm
acme-corp ESLint
trellix-trpc ESLint
good-defaults ESLint
trpc-tools ESLint
t3-appdir-clerk npm
agent-tools Prettier
stocks ESLint
ACTIVITY & OWNERSHIP
Active months 65
Commits 6371
Owner authored 91%
PRIMARY PROFILE — HR VIEW
FrontendTypeScript · JSON · JavaScriptHigh ownership
In 30 sec: direction — frontend, core — TypeScript · JSON · JavaScript, 269 repos 2020 — 2026. No LOC or files — stability only.
DEVELOPER SIGNATURE
TypeScriptJSONJavaScriptReactNext.jsHigh ownership
TECHNOLOGY EVOLUTION
2023
JavaScript · React
2024
TypeScript · Next.js
2025
TypeScript · PostgreSQL
2026
TS + Next
COMMUNITY / IMPACT not a skill rating
Stars 2469
Forks 112
Watchers 186
EVERYTHING ABOVE IS TRACEABLE
269 repositories · 6371 commits · 6659 files · 2184 evidence
Absence of a technology in the passport does not imply lack of experience