Turn marketing spend into predictable revenue — without burning runway.
For Seed to Series A B2B SaaS founders with early traction, growth complexity, and pressure to make revenue repeatable.
For 6 months I run growth end-to-end: I fix measurement, build acquisition + lifecycle loops, and install a weekly growth cadence that keeps improving results after I'm gone. When needed, I bring in trusted specialists (analytics, CRM, paid, creative) so the key pieces get built properly — fast.
Built growth across acquisition, lifecycle, analytics, and creative
€5M+ monthly acquisition budgets managed
40+ markets, 50M+ users across portfolio
Built growth functions at bunq, Bitvavo, Dyme, Guud
To install a growth system your team owns.
Most consulting engagements end with a deliverable. This one ends with operating capability — your team running a growth engine I'm no longer in.
Six months of hands-on installation: measurement, acquisition, lifecycle, cadence. Then handover, with runbooks, dashboards, and a hiring plan for the role I'm temporarily filling.
Six months of an unmeasured funnel at startup-scale CAC quietly burns €150k–€400k you'll never recover.
"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.
"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."
"I've worked with Maciej on multiple projects and he always delivers. He quickly identifies where funnels leak value and knows exactly how to fix it. Hands-on, no fluff, and great to collaborate with. Highly recommended."
GUUD · D2C consumer brand
· Brussels, Belgium
Growth was happening, but the process was ad-hoc — no shared system across paid, CRM, and CRO; momentum dependent on individual heroics.
Rebuilt the growth process end-to-end: measurement, paid acquisition, lifecycle, and CRO operating off one cadence.
Sustained MoM revenue lift through the engagement and after.
ONEFIT · Subscription fitness marketplace
· Amsterdam, Netherlands
Growth marketing existed in name but not in process. One-person team, no operating system, single-market business in a category that rewards scale.
Built the growth marketing function from scratch. Scaled the team from 1 to 5. Owned the launch into Germany and Spain.
International footprint set the stage for a successful merger with Urban Sports Club.
DYME · Personal finance fintech
· Amsterdam, Netherlands
Series-A consumer fintech with no marketing function, no growth plan, and a product that needed both performance and brand to scale beyond early adopters.
Built the growth plan from scratch. Recruited and onboarded the first marketing team. Launched Dyme's first offline branding campaign. Opened a new vertical — health insurance.
Team in seat, brand campaign live, health vertical shipped. Growth function built from zero.
Four things most teams never build — because no single hire or agency owns all four. This engagement does.
One set of definitions and dashboards for CAC, payback, conversion, retention, pipeline, revenue — used every week, and in every board update. Reporting your team stops arguing about and starts deciding from.
Channel strategy, account structure, and a weekly cadence that improves cost per result — across paid, organic, and partnerships.
Onboarding, activation, retention, win-back — tied to revenue events, not newsletter opens. Built in Customer.io / Klaviyo / Braze.
Priorities, owners, decision rules, and a learning loop your team can keep running after I leave. No founder dependency.
Five layers. Built once. Owned by your team.
The map of how your business actually makes money — and where it leaks. Everything that follows ladders up to this. Without it, the other four layers are activity, not strategy.
Architecture, implementation, and handover. Not an open-ended retainer.
Two weeks pulling apart what exists, two weeks designing what should — measurement model, KPI tree, weekly cadence. By day 30 the team and I agree on the same picture.
Hands-on construction across acquisition, lifecycle, and conversion — in your tools, with your team, against your numbers. Specialists pulled in where needed.
The system stops needing me. Documentation, training, and a hiring plan ensure the next growth lead inherits operating capability — not a deck.
Output-based. Not activity-based.
| Full-time senior hire | This build-out | Agency | |
|---|---|---|---|
| Time to impact (start in days, not months) Hiring takes 3–6 months. Agencies start fast but never own the system. | ✕ | ✓ | ~ |
| Single accountable owner for the full system One throat to choke vs distributed accountability. | ~ | ✓ | ✕ |
| Works across acquisition + lifecycle + conversion (not one channel) Most agencies own a channel. Most hires own a function. Few own the loop. | ✓ | ✓ | ✕ |
| Decision-grade reporting (CAC, payback, retention) baked in The reporting that makes the next board meeting easier. | ✓ | ✓ | ~ |
| Specialist bench on demand (analytics, CRM, paid, creative) Analytics, CRM, paid, creative — without 5 separate vendor contracts. | ~ | ✓ | ~ |
| 6-month plan with a clear handover Defined endpoint, defined deliverables. | ✕ | ✓ | ✕ |
| Leaves you with assets your team can run (dashboards, playbooks, templates) Dashboards, playbooks, templates — yours to keep. | ~ | ✓ | ✕ |
| Reduces founder dependency (cadence + ownership + hiring plan) The point is that you stop being the system. | ~ | ✓ | ✕ |
The most expensive mistake is hiring too early — before you have a system to run.
€100k is a serious commitment. Here is how we make it reversible.
Strategy, instrumentation, build, handover. One accountable person for six months.
Paid media, lifecycle, analytics, copywriting, design. Billed inside the engagement, not on top.
Acquisition, lifecycle, and measurement — covered by one accountable team, not three.
Who couldn't cover all five disciplines anyway — and takes 6 months to ramp.
Built once. Owned by your team. Inherited by whoever replaces me.
You'll leave with two or three things you can act on this week — even if we never work together.
Send a Loom + read-only access to Stripe / GA4 / CRM (or just the Loom). I spend 45 minutes mapping acquisition, activation, and retention before we talk.
I show you the three specific points where you're losing the most money — with the numbers — and how I'd test fixes. You ask anything.
A 1-page summary: top 3 leaks, suggested experiments, rough scope if you want help. Yours to keep, share, or hand to anyone.
