Leon, full stack developer. Self-built web applications with React, Node.js and TypeScript.
Open to a permanent position, remote or hybrid in North Rhine-Westphalia.
Status unknown
Five are live, four of them without signing up.
Working time, leave and flextime under the German Working Hours Act and Federal Leave Act, plus project time and invoices under § 14 of the VAT Act. Every figure can be expanded to show what it is made of: which bookings, which target, from which contract.
Upload your own sources, ask about them in a chat and trace every statement in the answer back to the passage it came from. Citation numbers without a matching passage are dropped, every remaining one leads to its passage.
Monitors websites and servers, shows availability publicly and sends a mail when a service goes down and when it is back. A single hiccup raises no alarm, an outage only starts after several failed checks in a row.
Availability over the last 30 days, as of
Finds remote jobs worldwide that can be taken from Germany and tracks your own applications. Many “remote” listings only apply to one country: it reads the requirement from every listing and shows the sentence that rules an excluded job out.
As of
Twelve browser games with a leaderboard. The server replays every run from its inputs and computes the score itself, so the browser cannot dictate one.
Records when each device was on the home network, for months instead of the few hundred lines the FRITZ!Box keeps itself. A collector written in Go reads the box over TR-064 through a WireGuard tunnel, and Postgres turns that into sessions per device. Where data is missing, the history shows a gap instead of “offline”.
Private, reachable through a VPN only
What runs through the projects above.
Database schema, API, interface and deployment are built together, not as separate parts.
Real code from the minigames
api/src/db.ts
CREATE TABLE scores ( id INTEGER PRIMARY KEY AUTOINCREMENT, game TEXT NOT NULL, name TEXT NOT NULL, score INTEGER NOT NULL, duration_ms INTEGER NOT NULL, created_at INTEGER NOT NULL, ip_hash TEXT NOT NULL);
api/src/routes.ts
app.post<…>( '/score', … async (req, reply) => { const { token, log } = req.body … const game = session.game as GameId const result = replay(SIMS[game], session.seed, log) const score = result.score
web/src/shell/Leaderboard.tsx
<div className="board"> <h3>Bestenliste</h3> … <ol> {top.map((row) => ( <li key={`${row.rank}-${row.name}`} …> <em>{row.name}</em> <b>{row.score}</b> </li>
deploy/README.md
cd $ZIELgit pullcd deploydocker compose up -d --builddocker compose ps…curl -s \ https://minigames.dmn-software.com/api/v1/health
The applications run in Docker containers behind Caddy on a rented server, set up and maintained by hand.
Pick a flow to follow it step by step.
Status unknown
In the minigames the browser only sends inputs. The server computes the score itself, so the leaderboard cannot be fed with invented values.
In the source chat every statement in an answer leads back to the passage in the source, instead of having to be taken on trust.
Systems and tools for GTA V roleplay servers, such as banking, invoices and character selection. Most of them run on the versioned library dmn_base with database migrations and adapters for ESX, QBCore and Qbox.
A standalone bot for the Discord server that goes with the resources. Templates from a file and drafts from a language model go through the same schema check before it creates roles and channels.
Not publicly accessible
Interfaces rendered in the browser with sample data
Job offers, or questions about a project or the code: by mail or through the form.
The reply will come from kontakt@dmn-software.com.