Hi, I’m Bart Stemkens — a freelance digital marketer with 10 years of experience helping teams grow across the full funnel. I plug into startups and scale-ups to turn strategy into weekly execution — from SEO to SEA, from paid social to CRO and onboarding flows. Structured, hands-on, and always focused on real learning.
Let’s have a discovery call — no prep needed. Just show up, tell me where you are, and I’ll see how I can help → schedule discovery call
Not ready to talk? Drop your website and I’ll send you one growth experiment you could run tomorrow → get one free growth experiment
What I do
I work as a freelance digital marketer for B2B and B2C companies with digital products — typically 2 to 3 days per week. I plug into your team to take ownership of your growth strategy and execute across channels, pages, and data — from content and campaigns to dashboards and experiments.
This is what you can expect:
- Full-funnel strategy & execution (SEO, SEA, Paid Social, CRO)
- Landing pages, messaging and onboarding flows
- Clear KPIs and weekly tracking
- Tactical tests that help you learn (and grow) fast
For who I do this
Most teams bring me in when:
- Their marketing efforts are scattered — with no system to test, learn and prioritise what works.
- They need someone senior to take ownership and get things moving.
- They’re growing fast and need extra firepower, or someone left the team.
I work with SaaS, B2B and B2C companies — as long as there’s a digital product, a drive to grow, and a willingness to experiment.
You’ll probably get value from working with me if:
- You’re building something valuable, with early traction to prove it
- You’re serious about becoming a category leader
- There’s someone who can join a weekly check-in
- You know that fast learning beats guessing — even if an experiment flops
Testimonials
“Bart is a multi-skilled professional able to make your business grow. He can handle high levels of complexity, and is pleasant to work with at all times.”
— Rens, CEO @ KIMO“With Bart, you have everything you need to grow and scale—no extra resources required. If you could clone him, you’d leave your competitors in the dust.”
— Sarah, Head of Growth @ Small Improvements“Smart, pragmatic, hard-working, and a great guy to have around. Our intake doubled, and costs were cut in half. Bart takes initiative, makes decisions, and gets things done.”
— Marnix, Proposition Manager @ Nationale-NederlandenClient cases
From zero to 5,000 paying users in 14 months — with 90% trial-to-paid conversion.
150,000 onboarded users in 10 countries, with low CPA and improving D1 retention.
From 3 to 10 franchise offices, while cutting lead costs by 50%
Let’s start
If the testimonials or cases weren’t enough to convince you to schedule a call, I’ve got one last move: send me your website and I’ll reply with one growth experiment you could run tomorrow. Free. No pitch. No strings.
FAQ
