Freelancer profile translated to English.
Back to original languageAbout Patrick
I develop scalable web applications and microservice architectures in C#/.NET and PHP/Symfony -- from the backend, through cloud infrastructure (Azure, AWS) to the frontend (React, TypeScript).
What sets me apart:
- Over 10 years of experience in software development, including for KTM AG, Fielmann AG, and Delticom AG
- Deep understanding of the entire stack: backend services, APIs, CI/CD pipelines, containers (Docker, Kubernetes), and cloud deployments
- Rapid implementation through targeted use of AI tools like Claude, ChatGPT, and GitHub Copilot -- naturally, only in consultation with the client. For sensitive projects, I work in a data protection-compliant manner with local LLMs to increase code quality and development speed without data leaving the company.
- 100% response rate and an average response time of 2 hours -- even short-term projects are no problem.
I work remotely or on-site (Hannover, Hamburg, Berlin, Munich, Stuttgart region) and am accustomed to quickly familiarizing myself with existing codebases and teams.
Let's talk about your project -- I look forward to your message.
English
Fluent
German
Native or bilingual
Can work on-site
Algermissen (up to 50km), Hamburg (up to 50km), Berlin (up to 50km), München (up to 50km), Stuttgart (up to 50km)
Experience
- on-geo GmbHModular further development of a real estate valuation SaaS (ASP.NET Core / Playwright)REAL ESTATEFebruary 2025 - Today (1 year and 6 months)Erfurt, GermanyFurther development of the SaaS platform Accumate from on-geo GmbH – a web-based real estate valuation solution for professional users from the finance and real estate industries. Building an E2E test strategy with Playwright (Page Object Model, Multi-User-Auth). Introduction of a pragmatic testing strategy with CI/CD pipeline integration.
- KTM AGManagement software for KTM AGAUTOMOBILEJanuary 2022 - December 2024 (2 years and 11 months)Wien, AustriaIt’s a complete rewrite of the existing management system. Complete new as a huge microservice infrastructure in an easy scalable and secure cloud environment. The company wants to save much working hours by optimizing existing workflows with the new software.My part is the development & maintenance of few backend services within that microservice architecture and the connection with the frontend via a BFF layer. Also, the connection between services through ServiceBus messages with contracts and common abstractions.
- Fielmann AGEvolving software for paymentE-COMMERCEJuly 2021 - December 2021 (5 months)Hamburg, GermanyImplementing new payment methods and improving software in C#, HTML and TypeScript/React. Working with some CI software for automation.
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Education
- IT specialist for application developmentIlsede, Peine2015Bereits vor der Ausbildung habe ich mir das Programmieren mit 12 Jahren autodidaktisch beigebracht und erste eigene Projekte umgesetzt. In der Ausbildung konnte ich diese Leidenschaft professionalisieren: Neben den technischen Grundlagen in Softwarearchitektur, Datenbanken und Projektmanagement habe ich vor allem den professionellen Umgang mit Kunden und die Arbeit in Teams gelernt. Der Ehrgeiz, mich ständig weiterzuentwickeln, hat mich schon während der Ausbildung zur Gründung meines eigenen Unternehmens geführt