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Achievement: Public SponsorAchievement: Pull Sharkx2Achievement: Pair ExtraordinaireAchievement: YOLOAchievement: QuickdrawAchievement: Arctic Code Vault Contributor

Achievements

Achievement: Public SponsorAchievement: Pull Sharkx2Achievement: Pair ExtraordinaireAchievement: YOLOAchievement: QuickdrawAchievement: Arctic Code Vault Contributor

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@BinaryBurst @BetaQuestCode

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chfle/README.md

Christian Lehnert  ·  Backend & Security  ·  Self-hosting since 2012  ·  🇨🇭

whoami

Software developer with a security focus. Java / Spring Boot, .NET / EF Core, TypeScript, Python. Daily on Debian + i3 + tmux + HHKB. Daf Yomi reader.

I build things and self-host them. If a service runs on c0xl.ch, it runs on my own hardware, behind my own perimeter, with my own keys.

Currently

  • c0xl.ch — personal infrastructure
    c0xl.ch chat.c0xl.ch sync.c0xl.ch pdf.c0xl.ch
  • MCP servers — pdf.c0xl.ch (Word→PDF), more in the queue
  • Homelab — Proxmox cluster on Dell VRTX (3× M630 blades)

Stack — the honest version

Domain Tools I actually use
Languages Java · C# · TypeScript · Python · Bash
Backend Spring Boot · Spring Security · .NET / EF Core · Node.js
Data PostgreSQL · MariaDB · Redis
Infra Debian · Docker · Proxmox · Caddy · WireGuard · wstunnel
Network Cisco Catalyst · MikroTik RouterOS · VLAN / ZBFW design
Security Web app pentesting · network hardening · self-hosted everything
Editor Vim · IntelliJ · Rider

Contact

Pinned Loading

  1. learning-linux learning-linux Public

    Basic Repo to learn linux

    Python 2

  2. portarbiter portarbiter Public

    Linux system administration tool that determines who actually owns a TCP listening port.

    Go 1

  3. functional_programming_java functional_programming_java Public

    Some functional programming notes

    Java

  4. AZN_Webclient_copy AZN_Webclient_copy Public archive

    AZN Webclient copy for done project

    JavaScript

  5. AZN_Resource_Server_Copy AZN_Resource_Server_Copy Public archive

    AZN Resource Server Copy for done project

    Java

  6. vl53lox_pico.py vl53lox_pico.py
    1 
    # For Rapberry Pi Pico
    2 
    # From kevinmcaleer
    3 
    
              
    
              
    
                4
                
    from micropython import const
    
              
    
              
    
                5
                
    import ustruct
    
              
    
          
    
    
    
  
    

    7.