35+ years building
software that lasts
Senior freelance developer and software architect. I design and build secure, scalable web and app solutions, server-side tooling, and Linux infrastructure for mid-size companies and enterprises across Germany and Europe.
Christian Döbler
Software Architect & Senior Developer · iSAQB CPSA
From architecture to deployment
Senior-level expertise across the full delivery lifecycle — strategic design, hands-on implementation, and long-term maintainability.
Software Architecture
System design, architectural reviews, and technical strategy. iSAQB CPSA certified — designing systems built to scale and outlast the project.
Web & App Development
Custom web applications and software products — PHP/Laravel, JavaScript, Python. 25+ years of production experience across every layer of the stack, from browser to backend.
Linux Administration, Server Tools & Security
Linux server administration and hardening (LPIC-1 & 2), custom server-side tooling and monitoring, security auditing, and GDPR-compliant data handling certified at DPO level.
AI Agents & Automation
Python agents that use your tools and data — LLM APIs, MCP, RAG. Connected to the systems you already run, with a human in the loop where it matters.
AI-Augmented Development
Faster, cost-efficient delivery using AI tools — validated by 35 years of engineering expertise. Speed without compromising quality or security.
Web Accessibility
BFSG / WCAG 2.1 compliance consulting and implementation. Audits, remediation, and accessible-by-default development.
Work that speaks for itself
A selection of challenges tackled and outcomes delivered. Client names withheld — references available on request.
Telecommunication
Network of high-performance servers for a major telecom company
For a major telecom company, I implemented and secured a network of high-performance servers and monitoring to measure peak traffic demands, ensuring seamless operations and improved customer experience.
Telecommunication
Platform for server management
For a telecom company, I developed a comprehensive server management platform using Laravel, providing modification of server parameters, traffic tracing, monitoring, and maintenance. In addition, resources can be made available to external service providers so they can conduct independent measurements.
International automobile trade
Platform for automation of international automobile trade
For an international automobile trade company, I developed a platform for automation of trade processes, including creating of legal documents, document management, creating of quotes and invoices, automated emailing, syncing of documents between storages and reporting.
Public sector
Application for management of members and events in the public sector
For a public sector organization, I developed a platform for management of members and events, including event scheduling, event management and reporting. After completing the development, I set up a Linux server at the organization's premises and made the application available there.
Small and Medium-Sized Businesses
ERP System for the Sales and Maintenance of Municipal Machinery
For the sales and maintenance of municipal machinery, I designed and developed an ERP system to manage customers, suppliers, orders, inventory, quotations, and invoicing. In addition, comprehensive reporting capabilities were implemented.
Agencies
Consulting and Development for Agencies
Over the years, I have also implemented hundreds of projects for agencies. The requirements for these projects were always heavily influenced by the programming languages and frameworks of that time. In addition, I was frequently called upon to implement immediate countermeasures against attacks and to analyze hacking incidents.
Deep, proven expertise
What I actually build, and what I build it with. Most engagements touch more than one of these areas.
Custom applications
Business software, internal tools, and customer portals — built when off-the-shelf stops fitting.
PHP · Laravel · Livewire · Filament
Websites & user interfaces
Public-facing sites and editorial systems your own team can operate without a developer on standby.
WordPress · JavaScript · TypeScript · HTML / CSS · React.js · Vue.js · Alpine.js
Servers & automation
The layer underneath: Linux servers, deployments, background jobs, and scripts that delete manual work.
Linux · Bash · Python
AI agents
Python agents that use your tools and data — connected to existing systems, with a human in the loop where it matters.
Python · JavaScript · LLM APIs · MCP · RAG
- Selection of languages I developed in:
- ActionScript, Assembler, Basic, C, C++, C#, Delphi, Java, Objective-C, Pascal, Perl, Prolog, Swift.
- Selection of frameworks & CMS I used in projects:
- CakePHP, Contao, Drupal, jQuery, MODX, React Native, Symfony, Typo3, Zend Framework.
Every skill listed was used in live production projects — no superficial familiarity, no checkbox entries.
Tomorrow's speed, today's reliability
AI-assisted development offers real gains in delivery speed and cost — but only in expert hands. With 35 years of engineering experience as the safety net, you get fast output that is also secure, maintainable, and correct.
- Significantly reduced time-to-market on suitable projects
- Every AI-generated line is reviewed and validated by a senior engineer
- Secure, performant output — not just fast output
- Cost savings passed directly to the client
- You benefit from tomorrow's tooling without taking on the associated risk
The best of both worlds
You get a single, senior point of contact with full accountability — and the scalable capacity of an agency when a project demands it.
Over two decades of freelancing, I've built a trusted network of professional developers — vetted collaborators who step in when a project's scope or deadline demands extra hands.
You always deal directly with me. Briefings, decisions, accountability — all in one place. No account manager in between, no information lost in translation.
Whether you need a single senior developer or a small, focused team for a critical deadline: one conversation is all it takes.
Certifications
Formal recognition of expertise across architecture, development, infrastructure, and compliance.
iSAQB® CPSA — Foundation Level
International Software Architecture Qualification Board · Certified Professional for Software Architecture
Laravel Certified Developer
Official Laravel certification · PHP framework specialisation
LPIC-1 & LPIC-2
Linux Professional Institute · Junior & Advanced Level Linux administrator
Data Protection Officer
DSC Standard · BDSG / GDPR · Certified data protection officer
30+ years of continuous learning
Formal certifications are checkpoints — the real credential is three and a half decades of building, shipping, and learning from production systems in a fast-moving industry.
Ready to build something that lasts?
Senior software architecture and development — remote and on-site across Germany and Europe.
Christian Doebler Software Development & IT Services · Kientalstr. 3 · 82211 Herrsching am Ammersee · Germany
