Who I am

My name is Marc.

I live in Kempten (Allgäu) and since 2012 I am working as a freelance consultant for web performance, web sustainability and as a web developer.

My areas of expertise are web performance and sustainable ecological digitization / green IT in companies. In my work, I make my customers' digital products more sustainable and faster, which improves business results and accessibility.

I also give talks and workshops on the topics of web performance, accessible internet and sustainable ecological web development.

I am working as a Web Performance Consultant, a Web Sustainability Consultant, a Web Developer, a Frontend Architect, and as a trainer for developers.

Portrait of Marc Radziwiwll in Kempten

Web Performance Consulting

I am a Web Performance Consultant with a passion for fast sites. I offer web performance audits or analyzes for your company and workshops for developers or development teams.

Web Performance is still one of the most underrated topics in web development. Even though it can help us, our companies and customers with their online business. It makes our websites more accessible for people with a slow network and has a significant impact on a sustainable internet.

Trusted by more than 50 customers in multiple countries intersection

  • logo of Carb Manager
  • logo of Merkle Germany GmbH
  • logo of Studio Leeflang - agency for eco-social marketing
  • logo of Namics (Deutschland) GmbH – A Merkle Company
  • logo of DebugBear
  • logo of Packiteco GmbH
  • logo of itv society for industrial tv mbh
  • logo of Panstream AG
  • logo of Simon Schnetzer
  • logo of Isenhoff GbR
  • logo of Time2tri
  • logo of STUDIO SOMO
  • logo of König GmbH
  • logo of White & friends.
  • logo of häußingerdesign.
view more

Web Sustainability

How ecologically sustainable is a site? Why is this important, and how can a page be programmed sustainably in a cost-effective manner. Digital technologies are currently responsible for 4% of global greenhouse gas emissions, and our websites are getting bigger and bigger.

A sustainable site saves server costs and contributes to environmental protection. A switch to a more environmentally-friendly site is also possible without any restrictions. We have a social responsibility to keep our digital footprint as low as possible. In addition, sustainable websites are also more efficient and thus stimulate online business.

Web Development

I am a Frontend Architect with more than a decade of experience. You can hire me for any web development project.

I'm working with VanillaJS, ReactJs, Angular, testing frameworks, real-time libs, frontend build tools, web servers, serverless programming, Rust, and much more.

If you are missing any mention here, reach out to me or check my FAQ section.

For what can you hire me

What customers are saying:

Technical consulting

Due to my many years of experience on different projects in many roles, I am regularly confronted with the challenges of large software- and design systems.

In my consulting, the following benchmarks are essential: scalability, reliability, implementation of best practices, ensuring technical viability and performance.


Your company is facing a significant migration, and you need help? Are you looking for a training opportunity for your development team?

I offer remote and on-site workshops for developers and development teams on Web Performance, Web Accessibility and JavaScript.

More information

How can you contact me?

You can drop me a line, and I come back to you as soon as possible.

How high is my hourly rate / daily rate?

We negotiate my hourly or daily rate based on the services for which you book me. Please ask me directly, and we will talk about your project and the price without obligation.