You can rely on my experience as a CRO freelancer: as part of numerous projects, I have been able to support well-known companies from various industries in optimizing their digital offerings. Here you will find a selection of my most important reference customers and an insight into the respective tasks and my activities. See the results of successful collaboration for yourself!

H World International (Steigenberger, Intercityhotel etc.)

H World International, based in Frankfurt am Main, is a leading company in the international hotel industry. Its portfolio includes renowned hotel brands such as Steigenberger Hotels & Resorts, MAXX by Deutsche Hospitality, Jaz in the City, Intercityhotel and Zleep Hotels. With a broad range of brands, H World International serves a wide variety of target groups – from luxurious five-star hotels to modern budget hotels.

My job at H World International

As a CRO consultant, coach and developer for A/B testing tools (VWO & Kameleoon), I supported H World International across several projects. My tasks included setting up and implementing an in-house CRO program as well as developing and managing the CRO roadmap for the international booking platform hrewards.com.

I enabled the e-commerce team to design, carry out and evaluate A/B tests independently – without external support. I also established an efficient test idea management system with regular ideation sessions, backlog, prioritization, board and test archive. Another focus was the development and implementation of complex A/B tests on a React-based application.

Time period

April 2023 – October 2024 (19 months)
from March 2025 – ongoing

Experimentation Stack

Kameleoon, VWO, Mapp, Google Analytics, ZenDesk, React Native

Feedback

Andreas Höcherl (H World International)

“With Oliver’s help, we were able to anchor conversion rate optimization as a structured program and achieve a positive ROI after a short time.”

Andreas Höcherl – H World International


Misumi Europa GmbH

Misumi Europa GmbH, based in Frankfurt am Main, is part of the globally active Misumi Group and is one of the leading B2B wholesalers for mechanical components and automation technology. The company supplies customers from a wide range of industries with an extensive range of standardized and individually configurable components – quickly, reliably and in the highest quality.

My job at Misumi

As CRO Manager and AB Tasty Engineer, I have been supporting Misumi Europe as a freelancer since May 2024. My tasks include the development and evaluation of A/B tests with AB Tasty as well as the presentation of the results to relevant stakeholders. I develop hypotheses, create test concepts and regularly share my knowledge with the team. In addition, I advise the company on the development of an experimentation culture and support the integration of corresponding approaches into the organization and processes.

Time period

Since May 2024 – ongoing

Experimentation Stack

AB Tasty, Google Analytics, Rapidusertests


IONOS

Headquartered in Karlsruhe, Germany, IONOS is one of Europe’s leading providers of cloud infrastructure, hosting and telecommunications solutions. The company offers a broad portfolio of products and services for private and business customers – from domains and web hosting to cloud servers and professional email solutions.

My job at IONOS

As Conversion Manager and Adobe Target Engineer, I worked for IONOS as a freelancer in two project phases. My tasks included the implementation and development of A/B tests in Adobe Target and training the team in the use of the tool. I evaluated test approaches, developed hypotheses and test concepts and carried out the statistical analysis of the test results in Google Analytics or Adobe Analytics. I regularly presented the results and recommendations to both developers and stakeholders up to C-level.

Time period

April 2022 – March 2023 (12 months)
October 2023 – February 2024 (5 months)

Experimentation Stack

Adobe Target, Adobe Analytics, Google Analytics, Rapidusertests, Mouseflow

Feedback

Björn Seibert

“O. D. is a very experienced CRO freelancer with a strong technical background.”

Björn Seibert – IONOS


ScanHaus Marlow

ScanHaus Marlow, based in Marlow, is one of the leading German manufacturers of prefabricated houses. The company stands for innovative building concepts, the highest quality standards and individual solutions for clients – from modern detached houses to spacious bungalows.

My job at ScanHaus

As a Website Optimization Consultant, I have been supporting ScanHaus Marlow as a freelancer since March 2024. My tasks include coaching the team in the area of web analytics with Google Analytics 4 (GA4) and identifying optimization potential with the help of UX analyses and user survey tools. I develop and carry out A/B tests with Varify.io and regularly present ideas and results to the management. I also take on web project management tasks.

Zeitraum

March 2024 – December 2024 (10 months)

Experimentation Stack

Varify.io, Google Analytics, Looker Studio, Contao

Feedback

Hansjörg Kunze (ScanHaus Marlow)

“Together, we carried out a broad yet specific analysis of the most important parameters and made a lot of improvements.”

Hansjörg Kunze – ScanHaus Marlow


Do you also want to write a successful CRO story with your e-commerce team? Then get in touch with me without obligation: