Growth & Conversion Specialist | Amsterdam, NL
15+ years in SaaS, fintech, and ecommerce. I find where your funnel leaks money and fix it. Then I make sure your marketing spend actually pays off over time.
Currently taking on only 1 new client in Q2 2026.
Here's what you need to know: Most growth problems aren't about traffic volume - they're about value leakage at critical funnel stages. I help you identify where users drop off, why they churn, and which channels waste budget. Then we fix those specific points with measurable experiments that improve CAC, LTV, and payback period within 90 days.
Most founders think they need more traffic, bigger budgets, or new channels. But the truth is: most growth engines leak value. Funnels fail quietly in onboarding. Paid campaigns scale in one market but lose efficiency abroad. CRM flows run, but retention metrics don't move.
These leaks aren't obvious without structured data and a proven playbook. That's where I step in. I don't just patch one channel - I re-align acquisition, activation, and retention so they compound. The process: diagnose leaks -> run measurable experiments -> scale only what works.
My approach ensures that every euro invested returns measurable value. Instead of chasing vanity metrics, I help you achieve outcomes that matter: lower CAC, higher LTV, faster payback. It's about turning growth from guesswork into a predictable system.
In short: I combine 15+ years of hands-on growth experience with senior strategic thinking. Unlike pure strategists, I execute campaigns directly in your tools. Unlike pure tacticians, I align every test with board-level metrics like CAC payback and LTV. You get both the strategy and the implementation, without needing to hire a full team.
Many consultants either stay tactical (run ads) or stay strategic (advise only). I do both. I work inside your accounts, but I also bring the senior experience to align growth with investor expectations and board-level metrics.
With me, you don't get more tasks - you get a growth system that compounds.
The deliverables: Most of my work clusters around three outcomes: stronger CRM and lifecycle performance, better AEO and AI visibility, and clearer growth architecture (measurement, CAC/LTV logic, and what to do next). I still support acquisition and AI-powered execution where it compounds those outcomes — always tied to revenue metrics, not vanity activity.
I work across growth, but most inbound projects fall into three buckets: CRM and lifecycle work, AEO and AI visibility, or broader growth architecture. If one of these is your problem, start there.
Fix retention leaks, messy lifecycle logic, weak segmentation, and underused CRM platforms. Ideal for Customer.io, Klaviyo, Braze, and CRM implementation work.
Improve how your brand and content show up in AI Overviews, ChatGPT, Perplexity, and other answer surfaces without turning the site into SEO sludge.
For founders and operators who need a senior pair of hands across acquisition, retention, measurement, and experimentation - without hiring full-time too early.
A strategy session reviewing your funnel, retention, and acquisition, with clear next steps. It's a 60-minute deep dive where I map your current bottlenecks and create a prioritized action plan.
Most clients see lifts in 60-90 days, depending on funnel complexity and test velocity. Quick wins often appear within 2-3 weeks for simple optimization changes.
Yes, I work hands-on in ad accounts, CRM tools, and data stacks. I don't just advise - I execute the strategies I recommend to ensure they work.
Yes, I've scaled campaigns in 40+ markets, handling localization, attribution, and ad ops. I specialize in wave-based rollouts that minimize risk while maximizing scale.
SaaS, fintech, ecommerce - subscription models and multi-market growth. My experience spans from early-stage startups to €100M+ revenue companies.
Engagements are scoped by problem and impact — most often CRM and lifecycle implementation, AEO and AI visibility programs, or growth architecture and measurement work. I also support ongoing senior partnership when the roadmap is clear. Most clients start with a Strategy Call to align on priorities and the right depth of engagement.
Absolutely. While I'm based in Europe, I work with companies globally. My experience spans North America, Asia-Pacific, and Latin America, with deep understanding of local market dynamics.
I typically work with companies spending €10K+ monthly on paid media. For smaller budgets, I recommend starting with an audit to identify the highest-impact optimizations first.
Success is measured by sustainable growth metrics: improved CAC/LTV ratios, increased conversion rates, better retention, and ultimately, profitable revenue growth. I provide detailed reporting and regular check-ins to track progress.
Both. I can complement your existing team by providing strategic direction and hands-on execution, or work alongside agencies to ensure alignment and avoid conflicts. I'm flexible about integration approaches.
I work with all major platforms: Google Ads, Meta, TikTok, LinkedIn, Customer.io, Braze, Klaviyo, and various analytics tools. I'm platform-agnostic and choose the best tools for your specific needs and budget.
I'm fully GDPR compliant and work within your existing privacy frameworks. All data handling follows strict security protocols, and I can sign NDAs and data processing agreements as needed.
I identify and fix specific conversion blockers: unclear value propositions, friction in signup flows, poor onboarding sequences, leaky checkout processes, weak retention triggers, and misaligned acquisition channels. Each fix is tested and measured against clear revenue metrics like CAC payback and LTV improvement.
Hire a growth consultant when you have product-market fit but growth has plateaued, when CAC is rising faster than LTV, when you're scaling to new markets and need structured playbooks, or when your team lacks senior growth expertise. Ideal timing is when you have budget to test but need strategic direction.
Most clients see lifts in 60-90 days, depending on funnel complexity and test velocity. Quick wins often appear within 2-3 weeks for simple optimization changes. Sustainable growth improvements typically compound over 3-6 months as we optimize multiple funnel stages and build repeatable processes.
Yes, I work hands-on in ad accounts, CRM tools, and data stacks. I don't just advise - I execute the strategies I recommend to ensure they work. This includes campaign setup, A/B test implementation, tracking configuration, and ongoing optimization based on performance data.
Use my free AEO Score Tool to check how well your content performs in AI-powered search engines like ChatGPT and Google AI Overviews. The tool analyzes entity recognition, evidence quality, and experience signals, then provides a tailored fix plan to improve your visibility in answer engines.
Practical checklist for data, events, integrations and lifecycle flows so your CRM implementation does not turn into technical debt.
Open checklist
"Since I started working with Maciej, our business has undergone a significant transformation. He introduced me to the essential principles of growth processes and offered hands-on support with specific projects and ideas that helped us regain momentum. He has the ability to consider all aspects, from team dynamics and company culture to processes, platforms, and technology. I highly recommend him."
Jan Deruyck, co-founder — Guud
"Maciej is a standout performance marketer who combines sharp analytical skills with a truly innovative mindset. During his time at OneFit, he was not only deeply committed to our growth but also became a beloved member of the team. His hard work and ability to turn data into results make him an asset to any forward-thinking company."
Serge Brabander, co-founder — OneFit
Book a quick intro call or send me a short brief. I'll review your funnel and reply with next steps – no fluff, no hard sell.
Use this short call to pressure-test your current funnel, ask questions, and see if it makes sense to work together.
Share a few details about your product, traffic, and where you think the funnel is leaking. I'll reply personally.