Growth Marketing Manager
based in Stuttgart
Eight years ago, I thought I was going to be a software engineer. Code, hoodie, startup dreams — the whole thing.
Then I pivoted. At 15.
Somehow I ended up doing marketing instead — shooting videos, running Meta ads, and convincing local small businesses to let a teenager handle their advertising.
My first “clients”?
• A mechanic
• A restaurant
• A paint shop
• And an HVAC business
(Okay, fine — 3 out of 4 were my cousins. You gotta start somewhere 😅)
The crazy part? They were happy. The ads worked. The videos looked good.
But I wasn’t. I had no idea what I was doing or why I was doing it.
That was my first taste of business — and my first taste of confusion.
Then I decided to double down. I joined an 8-month marketing bootcamp.
My goal wasn’t just to learn the technical stuff — I wanted to meet people actually doing this for real.
Halfway through, the instructors pulled me aside.
They called me a “wunderkind” and offered me a full-time role.
By 18, I was running online events, webinars, and quiz funnels that pulled in 20,000+ inbound leads and over €600,000 per year in revenue.
At 19, after work I became an instructor — teaching Growth Marketing, Email Automation, CRO, and HubSpot to 650+ students.
At 22, I was behind AIatWork, Brainster's flagship SaaS product, building the growth engine from quiz funnels to paid acquisition to CRM automation.
At 23, I joined Valuecase, a VC-backed B2B SaaS in Hamburg, as their Growth Lead.
I owned the entire growth function, from demand generation to paid acquisition. I powered the company's record new-customer month, up 25% on the prior best, and cut CPL by 40% while improving lead quality. I led positioning and GTM for the AI suite, which became one of the product's most-used features, and built AI-native workflows across reporting, creative, and content.
The vast experience I have gained working across the whole marketing funnel allows me to shape a strong CRO output for my clients which results in optimized ad spend, decrease in CPA/CPL, and increase in sales.
This means having complete control over the entire CRO process: UX audits, user research, strategy, wireframing, copywriting, data analysis, AI creative production, AI content marketing, reporting, presentations, and of course, A/B testing.
Because nothing beats the dopamine hit of a winning A/B test. :)
Ed-Tech & SaaS
Client and Student feedback
William is a key employee in one of our companies. He doesn’t need me anymore—he’s built his own path.
It was a blast having you on the team!
I am grateful for the unreserved support. Your mentoring has been a high level for my special knowledge Already started implementing some of these techniques in my campaigns with promising results. Thank you again for your dedication and expertise.
Having William as my instructor for lead generation and email marketing was a fantastic experience. His teaching style is both interactive and insightful.
He's always available for extra help or a deeper explanation when needed. Thanks to his expertise and willingness to share his knowledge, I have significantly improved my marketing skills.
It and was very nice to work with you, both professionally and personally! Hope you'll have great success in your career (which I'm sure about!)
William was incredibly passionate and committed to his classes. He was also incredibly clear and eager to assist any student who needed assistance learning the subject.
On my Hackaton, which was organized by Brainster, I also got the opportunity to work with William, who was available the entire time, even when he had time off.
I just want to emphasize that everyone who meets William will have a great experience.
William and I first crossed paths when he was a student at our Digital Marketing Academy.
He quickly distinguished himself through his remarkable potential, strong work ethic, and an insatiable curiosity — qualities that set him apart from most of his peers
When I started at Brainster, William and I faced every marketing team challenge together.
His drive to learn and improve not only inspired me but also made my transition effortless — a role he completely stepped into just two years later.
