Freelance · Cologne · remote
Performance marketing
freelancer
I’m Marcel Jendrusch, a performance marketer based in Cologne and in digital marketing since 2004. As a freelancer I run paid ads and the path after the click: landing page, onboarding, paywall, and the tracking that shows which of it pays. I work remotely and take on a small number of projects.
- Digital since 2004
- Meta × Google × TikTok × Apple
01 What I care about
The whole funnel
decides
Good campaigns don’t beat bad ones on better creatives alone. In the end the whole funnel decides:
- Does the tech work, and does the tracking measure correctly?
- How is the landing page built, and does it load fast?
- Are there steps in the funnel nobody needs?
- What happens after the enquiry, before and after payment, after the purchase?
Only once tracking, tech and processes are in good shape do the creatives, the tone and the messaging make the difference.
02 Services
What I take on
- 01
Paid ads
Meta, Google Ads, TikTok and Apple Search Ads. Account setup, creative testing and budget decisions made on CPI, ROAS and payback.
- 02
Funnel & conversion
Landing page, app store page, onboarding and paywall: the stretch between the click and the purchase.
- 03
Tracking
Attribution with GA4, GTM, Conversion API and Adjust, so it is clear which ad brings paying customers.
- 04
Subscriptions
Paywalls and subscriptions in apps, built with your dev team on Adapty, RevenueCat or Stripe.
- 05
SEO & GEO
Visibility in search engines and in AI answers from ChatGPT, Perplexity and Gemini.
- 06
Creatives with AI
Hooks, angles and ad copy from my own Claude agents, so creative testing does not stall on output.
03 Results
What is behind it
- 0 → 1M+
- downloads
- 0 → 400,000
- users
- 18 → 35%
- store-to-install
- up to €150k
- ad budget per month
Most recently I was Senior Performance Marketing Manager at LEGACY Network AG. There I scaled the learning app Legacy Academy from zero to over a million downloads and 400,000 users, with up to €5,000 a day in budget, and raised its store-to-install rate from 18 to 35 per cent. At the end, up to €150,000 a month ran through Meta, TikTok, Google and Apple Search Ads.
Before and alongside that: paid ads, conversion and web work since 2004, for agencies, online shops and my own products at Scalr Ventures.
04 Who and how
How we work together
Who it is for
Small and mid-sized businesses, apps, e-commerce brands and agencies that grow through paid ads and have noticed that more budget alone stops working at some point. I’m most useful where the ad, the landing or store page and the product have to be looked at together.
How it runs
It starts with a look at the whole funnel, from the ad to the second purchase. From that we agree what I take on and how we measure the result. I work with few clients at a time, so each project gets proper attention. Contracts and invoices run through my company, Scalr Ventures LLC.
05 FAQ
Questions
Do you work remotely?
Yes, entirely. Calls happen over video, and you add me as a user to your ad accounts and analytics, so no passwords need to be shared.
What budgets have you managed?
The largest was up to €150,000 a month across Meta, TikTok, Google and Apple Search Ads. Smaller budgets work too, as long as enough data comes in to read a test properly.
Do you also work on the app itself?
Not as a developer, but together with your dev team, on the parts that decide conversion: the store page, onboarding and the paywall. I bring the analysis and the ideas to test, your team builds them. At Legacy Academy the work on the store page took the store-to-install rate from 18 to 35 per cent, so the same ad brought almost twice as many installs.
06 Contact
Let’s build
something
together
Write me a few lines about what you sell, where your numbers are and where it gets stuck. I’ll tell you honestly whether I’m the right person for it.