Freelancer profile translated to English.

Description

For the last five years, I was employed as a Frontend Developer at feelgrounds.de, a Shopify Plus brand in the barefoot shoe segment, before it was sold at the end of 2025.

There, I developed and extended the theme, built new features, and ensured the store ran technically smoothly. I also implemented landing pages for product launches and continuously improved UI & UX along the customer journey.

In parallel, I set up an A/B testing program with the German CRO agency Dripagency, which was based on data-driven hypotheses and brought a demonstrable revenue growth of 27% during this time.

You can find my case studies on these topics here on my website:

convert-x.org/#case-studies

My core offering:

Shopify Frontend Development with a focus on conversion optimization

- Theme adjustments, new features, landing pages

- Conversion optimization through A/B testing, upsells & targeted landing pages

- Page speed optimization

Industry field of expertise

Languages

German
Native or bilingual
English
Fluent

Workplace preferences

Remote only

Primarily works remotely

Feelgrounds Services GmbH
Frontend Developer
E-COMMERCE
June 2021 - November 2025 (4 years and 5 months)
During this time I worked in-house at Feelgrounds, a Shopify Plus barefoot shoe brand, supporting their growth from ~€2M to over €6M in annual revenue. Starting with development and design, I also built and ran their structured A/B testing program over the last two years. In the last calendar year alone, we ran 16 experiments with 5 winning tests, contributing to a measurable ~27% revenue uplift.

On the frontend development and design side, I worked on a wide range of store optimizations over four years, including menu redesigns, landing pages for new product launches and the post-purchase experience, page speed optimization aligned with Google's Core Web Vitals, and improvements to the product image gallery.

The extended in-house experience also taught me how to work closely with marketing, copywriting, design, and product teams. It gave me a comprehensive understanding of what makes a successful Shopify Plus brand, and helped me establish processes I now bring to every project.
Shopify Shopify Shopify Webdesign Front-End development