Freelancer profile translated to English.
Back to original languageAbout Marc
Anyone who wants to grow in e-commerce needs more than just good ideas – they need a system. A system of clean tracking, sound analysis, and a CRO strategy based on data, not gut feeling. That's exactly what I help with.
My focus is on the connection between data quality and conversion optimization: from the technical tracking foundation, through GA4 analysis and user research, to structured A/B tests and clear reporting in Looker Studio.
CRO Strategy & A/B Testing
Development of clear processes, hypotheses, and test roadmaps for structured, scalable conversion optimization
GTM Concept & Tracking Integration
Development of well-thought-out tagging concepts, including technical implementation for smaller projects
Data Analysis with GA4, Heatmaps & Session Recordings
Analysis of user behavior along the entire customer journey to identify drop-off points and optimization potential
User Research
Qualitative user research to not only see what's happening, but to understand why
Reporting & Dashboards via Looker Studio
Clear, decision-relevant dashboards that make key KPIs visible – for teams and stakeholders
I am available at any time for a free, no-obligation initial consultation – just send me a message or book a call directly.
German
Native or bilingual
English
Fluent
Can work on-site
Köln (up to 50km)
Experience
- Seamless Convert,Founder & CRO ConsultantSeptember 2025 - Today (9 months)Cologne, Germany
- Execution of data-driven conversion rate optimization measures (CRO) as well as conception and implementation of holistic analytics and tracking infrastructures
- Management and implementation of A/B testing programs throughout the entire process – from hypothesis development and test design to sound statistical evaluation
- Analysis of complex user behavior data and derivation of precise, strategic recommendations for management and executive leadership
- Megabad GmbH,Team Lead E-Commerce / Shop ManagerApril 2024 - August 2025 (1 year and 4 months)Cologne, Germany
- Professional and disciplinary leadership of an interdisciplinary team of several employees (Development, Category Management, Pricing) with a focus on analytics and optimization initiatives
- Responsibility for the strategic planning and prioritization of the A/B testing roadmap, including hypothesis development, experiment design, and sound result interpretation
- Execution of comprehensive qualitative and quantitative customer analyses (including UX research, funnel analyses, session recordings) to identify optimization potential
- Conception and implementation of a scalable tracking framework based on GA4 and GTM, as well as close collaboration with the pricing team to evaluate revenue and promotion effects
- Badesofa GmbHE-Commerce ManagerMarch 2023 - March 2024 (1 year)
- Responsibility for the successful market entry into the US market, including comprehensive market analysis, building the shop infrastructure, and scalable growth strategies
- Optimization of the EU online shop based on data-driven analyses (e.g., GetKlar) and execution of CRO-oriented UX tests to sustainably increase the conversion rate
- Development and modeling of sound conversion and revenue forecasts to support strategic business decisions
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Education
- M.Sc. Electrical Engineering &University of Stuttgart2018M.Sc. Electrical Engineering &
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