Available for Projects 2026

Don Irmscher Developer.

// Software Developer since 2012

Custom web applications, modern AI solutions, secure network infrastructure and powerful SIP phone systems – all from a single source. Based in Chemnitz. Serving all of Germany.

12+
Years Experience
100+
Projects
6
Specialisations
$ whoami
Don Irmscher – Full-Stack Developer & IT Expert
$ skills --list
→ Web: PHP, JavaScript, Bootstrap 5, HTML5
→ AI: LLM Integration, AI Workflows, Automation
→ NET: Linux Server, VPN, Firewall, VLAN
→ SEC: Penetration Testing, IT Security Concepts
→ VoIP: Asterisk, FreePBX, SIP AI Bots
$ status
✓ Available for new projects
DI

A Passion for Technology for Over a Decade

My name is Don Irmscher. Since 2012 I have been developing software and guiding companies on their digital journey. I combine deep technical expertise with pragmatic thinking – and deliver projects on time.

Chemnitz, Saxony Since 2012 Freelance Remote & On-Site
2012
Entry into professional software development
2014+
Expansion into networking & server infrastructure
2017+
IT security concepts & penetration testing
2019+
Modern SIP phone systems & VoIP solutions
2022+
AI integration into web applications & business processes
Today
Holistic IT consulting & development from Chemnitz

My Services

Comprehensive IT solutions from a single source – from the initial concept to ongoing operation.

Web Development

Modern, responsive web applications with clean code. From landing pages to complex enterprise applications – tailored to your requirements.

PHP JavaScript Bootstrap 5 HTML5 CSS3 MySQL REST API
AI Applications

Integration of modern AI models into existing systems and business processes. Chatbots, automation, data analysis and intelligent assistants for your company.

LLM Integration OpenAI Ollama RAG AI Workflows Automation
Networking

Planning, setup and operation of modern network infrastructures. VPN, VLAN, routing, switching and WLAN – reliably and scalably configured.

TCP/IP VPN VLAN WLAN pfSense MikroTik Ubiquiti
Server Technologies

Setup and administration of modern server environments. Linux servers, web servers, databases, Docker, Proxmox – professionally configured and maintained.

Linux Apache Nginx Docker Proxmox MariaDB PostgreSQL
IT Security

Analysis of security vulnerabilities, hardening of existing systems and development of comprehensive IT security concepts. Keeping your data where it belongs.

Penetration Testing Hardening Firewall SSL/TLS Backup GDPR
SIP Phone Systems

Modern IP phone systems with AI integration. Automated call handling, IVR systems and intelligent voice bots – for professional business communication.

Asterisk FreePBX SIP VoIP IVR AI Bots 3CX

Skills & Stack

More than a decade of hands-on experience with a broad technology stack.

PHP JavaScript HTML5 CSS3 Bootstrap MySQL MariaDB PostgreSQL Linux Docker Nginx Apache Git Python Asterisk FreePBX pfSense Proxmox OpenAI API REST JSON AJAX jQuery
PHP & Web Backend 95%
HTML5 / CSS3 / Bootstrap 97%
JavaScript / jQuery 88%
Networking 85%
Linux Server Admin 90%
IT Security 82%
AI Integration 80%
SIP / VoIP / Asterisk 85%
Docker / Virtualisation 78%

Let's Talk

Have a project? A question? Just write to me.

Contact Details

Name
Don Irmscher
Address
Geschwister-Scholl-Str. 25
D-09114 Chemnitz
Fax
+49 (0) 371 - 495 297 32

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