## SYNOPSIS

## DESCRIPTION

Tobias Ludwig ist ein Full-Stack- und Systems-Engineer mit Spezialisierung auf low-latency Backends, AI-Integration und self-hosted Infrastruktur. Berlin-basiert, hires unter Vertrag für technisch ambitionierte Projekte.

## EXAMPLES

 1#include <sys/mman.h>
 2#include <unistd.h>
 3 
 4int main(int argc, char **argv) {
 5    int fd = open(argv[1], O_RDONLY);
 6    off_t sz = lseek(fd, 0, SEEK_END);
 7    void *p = mmap(NULL, sz, PROT_READ, MAP_PRIVATE, fd, 0);
 8    write(STDOUT_FILENO, p, sz);
 9    return 0;
10}

 1use tokio::sync::mpsc;
 2 
 3async fn forward(mut rx: mpsc::Receiver<Frame>, tx: mpsc::Sender<Frame>) {
 4    while let Some(frame) = rx.recv().await {
 5        if tx.send(frame).await.is_err() {
 6            tracing::warn!("downstream closed");
 7            break;
 8        }
 9    }
10}

 1import { db } from "@/db";
 2import { applications, eq, and } from "@/schema";
 3 
 4export async function openFor(userId: string) {
 5    return db.select().from(applications)
 6        .where(and(eq(applications.userId, userId), eq(applications.status, "open")))
 7        .orderBy(applications.createdAt);
 8}

 1SELECT
 2    date_trunc('week', signup_at) AS cohort,
 3    count(DISTINCT user_id) AS total,
 4    count(*) FILTER (WHERE last_seen > now() - interval '30 days') AS retained
 5FROM users
 6GROUP BY cohort
 7ORDER BY cohort DESC;

 1$ find . -type f -name '*.ts' \
 2    | xargs grep -lE 'console\.(log|error)' \
 3    | xargs sed -i '' 's/console\.log/logger.debug/g'

 1server {
 2    listen 443 ssl http2;
 3    server_name tjl-it.de;
 4    location / {
 5        proxy_pass http://127.0.0.1:3000;
 6        proxy_set_header Host $host;
 7        proxy_set_header X-Real-IP $remote_addr;
 8    }
 9}

## STATS

## PROJECTS

$ apt-cache search --mode=verbose tobias.*

## STACK

$ tree ~/stack -L 2 --dirsfirst

~/stack/
├── frontend/
│   ├── next.js (v16, React 19)
│   ├── typescript (strict, no any)
│   ├── tailwindcss (v4)
│   └── three.js + @react-three/fiber
├── backend/
│   ├── postgres (16+, drizzle-orm)
│   ├── node (24, hono)
│   └── python (uv, fastapi when needed)
├── infra/
│   ├── docker
│   ├── coolify (self-hosted)
│   └── nginx + cloudflare
└── ai/
    ├── claude api (sonnet 4.6+)
    ├── openai (gpt-5)
    └── comfyui + sd (local rtx 4080)

## PHILOSOPHY

• prod traffic deserves real testing, not mocks
• if you ship a feature flag, ship the kill switch
• pure functions where possible, pragma where necessary
• three commits beat one mega-commit
• git log is documentation
• benchmark before optimizing; profile before refactoring
• reading code beats writing code
• a slow query is a bug, not a feature
• self-hosted until you can't

## CONTACT

% whois tobias.ludwig

Domain Name:           tobias-ludwig.de
Registrant:            Tobias Ludwig
Country:               DE (Berlin)
Email:                 hello@tjl-it.de
PGP Fingerprint:       4F3A 9E7C 8B12 6D5A E901 7C44 22FB 1A8E 3D90 6B11
Languages:             de, en
Open for contracts:    yes (AVAILABLE Q3 2026)
Response time:         < 24h
Last updated:          2026-05-08

## FILE

File:

/var/www/tobias/index.html

Size:

~ 14kb gzipped

Last modified:

2026-05-08T14:22Z

Build:

nextjs/16.0.1

Commit:

b78cc12

Hosted on:

coolify.tjl-it.de

Region:

eu-central-1 (frankfurt)