# Christian Doebler

> Senior freelance software architect and developer with 35+ years of experience, based in Herrsching, Germany, available across Germany and Europe. Specialises in robust, secure, and scalable applications for mid-size companies and enterprises.

Christian Doebler Softwareentwicklung & IT-Services is a one-person freelance practice combining iSAQB-certified software architecture, full-stack development (PHP/Laravel, JavaScript, Python), Linux and security expertise, GDPR compliance (certified Data Protection Officer), web accessibility (BFSG / WCAG 2.1) consulting, AI-augmented development, and the development of AI agents (Python, LLM APIs, MCP, RAG). A network of vetted freelance developers is available to scale capacity for larger or time-critical projects, while the client always deals directly with Christian.

## Services
- [Homepage](https://www.christian-doebler.net/en): Overview of services, expertise, credentials, and selected projects.
- [Software Architecture](https://www.christian-doebler.net/en#services): System design, architectural reviews, and technical strategy (iSAQB CPSA certified).
- [Full-Stack Development](https://www.christian-doebler.net/en#services): PHP/Laravel, JavaScript, and Python — backends and modern frontends, 25+ years of production experience across the stack.
- [Linux & Security](https://www.christian-doebler.net/en#services): Hardened Linux environments (LPIC-1 & 2), security auditing, and GDPR-compliant data handling.
- [Web Accessibility](https://www.christian-doebler.net/en#services): BFSG / WCAG 2.1 compliance consulting, audits, remediation, and accessible-by-default development.
- [AI-Augmented Development](https://www.christian-doebler.net/en#services): Faster, cost-efficient delivery using AI tools, with every AI-generated line reviewed and validated by a senior engineer.
- [AI Agents](https://www.christian-doebler.net/en#skills): Python agents that use your own tools and data — connected to existing systems via LLM APIs, MCP, and RAG, with a human in the loop where it matters.

## Projects
- [Selected Projects](https://www.christian-doebler.net/en#projects): Case studies (client names withheld, references on request) including a high-performance server network and monitoring setup for a telecom company; a Laravel-based server management platform for a telecom company; a Laravel platform automating international automobile trade (documents, invoicing, syncing, reporting); a member/event management application for a public-sector organization; an ERP system (Zend Framework) for the sales and maintenance of municipal machinery; and years of consulting/development for agencies, including legacy code and hack/incident response.

## Blog
- [Blog index](https://www.christian-doebler.net/en/blog): Technical articles on software development, Linux, security, architecture, and AI-augmented development.
- [Multiple languages in Laravel](https://www.christian-doebler.net/en/blog/multiple-languages-in-laravel) (Sep 1, 2024): Implementing locale detection and multilingual routing in Laravel via middleware, without extra packages.
- [Create random strings in Bash](https://www.christian-doebler.net/en/blog/create-random-strings-in-bash) (Aug 3, 2024): Two reliable methods for generating random strings in Bash — using openssl and /dev/urandom — for process IDs and similar use cases.

## About
- [About me](https://www.christian-doebler.net/en/about): Biography from discovering a Commodore VC 20 in the 1980s, through Assembler/Delphi/reverse-engineering, a car-mechanic apprenticeship, computer science studies in Nuremberg, and co-founding three ventures (Buzzienda, 4freelance e.G., AMZSTARS — sold in 2020), to 35+ years of professional software development today, now centred on AI-augmented development and building AI agents.

## Credentials
- iSAQB® CPSA – Foundation Level (Certified Professional for Software Architecture)
- Laravel Certified Developer
- LPIC-1 & LPIC-2 (Linux Professional Institute — Junior & Advanced Level Linux administrator)
- Certified Data Protection Officer (BDSG / GDPR)

## Contact
- Email: mail@christian-doebler.net
- Phone: +49 8152 993 8198
- Address: Christian Doebler Softwareentwicklung & IT-Services, Kientalstr. 3, 82211 Herrsching, Germany
- [LinkedIn](https://www.linkedin.com/in/christian-d%C3%B6bler-6b820a53/)
- [Xing](https://www.xing.com/profile/Christian_Doebler6/)
- [GitHub](https://github.com/cdoebler)

## Optional
- [Privacy Policy](https://www.christian-doebler.net/en/privacy)
- [Imprint / Site Notice](https://www.christian-doebler.net/en/imprint): Legal entity details, VAT ID DE253982369, EU ODR platform link.

## German (DE)
The entire site is also available in German, mirroring the English structure 1:1.
- [Startseite](https://www.christian-doebler.net/de): German homepage.
- [Blog](https://www.christian-doebler.net/de/blog): German blog index.
- [Über mich](https://www.christian-doebler.net/de/about): German about page.
- [Mehrsprachigkeit mit Laravel](https://www.christian-doebler.net/de/blog/mehrsprachigkeit-mit-laravel): German version of the Laravel localization article.
- [Zufalls-Strings in Bash generieren](https://www.christian-doebler.net/de/blog/zufalls-strings-in-bash-generieren): German version of the Bash random-string article.
- [Datenschutz](https://www.christian-doebler.net/de/privacy): German privacy policy.
- [Impressum](https://www.christian-doebler.net/de/imprint): German site notice.