Ralf Siemon

With over 15 years of PHP experience, I bring in-depth knowledge of modern web development. I also have many years of Java experience from previous projects and am familiar with other languages and technologies. In recent years, I have primarily worked on B2B web applications in the e-commerce environment, including a shop system with over 40 concurrently operated tenant shops and an integrated backend. I have also designed and implemented ETL processes for data warehouse systems multiple times.

Most recently, I have intensively engaged with AI-assisted development (Claude Code) and actively use these tools in my daily work. I see them as a productivity multiplier and a sensible component of modern software development – without relinquishing professional review and architectural responsibility.

I particularly enjoy taking on projects where something structurally new is created or fundamentally rethought – be it a new development, a comprehensive overhaul, or the replacement of established legacy systems. I quickly familiarize myself with existing systems, build clean architectures, and translate functional and technical requirements into working software.

I hold a degree in Mathematics and have been self-employed since 2010.

I am currently looking for projects in PHP/Symfony web development – ideally with a capacity of 2 days per week. Projects related to data integration or data warehousing are also welcome.