Before advising anyone how to build, I took one venture from a cold market signal to paying users with zero churn. The calls in that case are the ones I bring into your team’s room.
Case № 01Master use case · one venture, end to end
DACH · 2025~6 min read
The pitch
From signal to product-market fit.
One venture, end to end. From a cold market signal to paying users with 0% churn. Plus the operating model that made it possible.
The numbers — end to endValidation → PMF
01 · Validation cost
< €10k
Signal to validated buyer.
02 · Ad spend
€0
Cold email to a waitlist page.
03 · Build time
~2.5mo
Two-week cycles, end to end.
04 · Churn at PMF
0%
Paying users. They keep using it.
The pivot — stage 03
The pain was real. The budget was one layer up.
Picked the wrong audience first. Interviews exposed it. Rebuilt around the buyer one layer up.
Wrong
Has the painNo budget
vs.
Real
Has the budgetDecides
The case has the pipeline, the operating-model change, and the result. About six minutes.
A workshop, a working session, or senior sparring for the people building your product. Always on something live from your backlog, never on a case study.
How it worksBY THE DAY
The day
Your product and engineering people, in one room.
on-site or remote · product & engineering · your live backlog
We take something you are building right now and rebuild how it gets shipped.
Product and engineering in the same room, because the handoff between them is where the time goes.
The decisions made in the room, written down, so the team can keep running them.
Senior sparring afterwards if you want it to bed in. Some teams take the day and run.
On your work, with your people. Not a slide deck. Not a framework. Not a coach.
04 — What it's like to work with meFrom founders & researchers
"Parachute in and build what runs."
“
Mario has an incredible gift for early-stage venture building. He took us from an initial idea to a validated MVP within a few weeks.
Janis Schumacher
FOUNDER IN RESIDENCE · 120 VENTURES
“
He rolls up his sleeves and gets things moving. True to his “parachute in and build what runs” mindset.
Andrej Bielicky
FOUNDER · MIINA
“
Mario turned, in less than two weeks, years of scientific research into tangible product features that anyone could understand.
Michael-Bernhard Zita
RESEARCHER · CFEPS
“
He is very quick in grasping what we need and then ruthlessly executing on it. Swift, reliable, professional. A hard recommend.
Justin Nogarede
SENIOR POLICY ANALYST · FRIEDRICH-EBERT-STIFTUNG
05 — Common questionsBefore you reach out
Five questions I get most.
01What is a Principal Product Operator?+
Someone who has carried product and engineering himself, not advised on them from the side. That is what I bring into your team: I sit with your product and engineering people on the work they are actually building, and we change how it gets built. The judgment comes from having shipped the thing, not from a framework.
02How does a workshop day run?+
On your real work, never a case study. We take something live from your backlog and rebuild the way your team takes it from idea to shipped, AI-native. Your product and engineering people are in the room together, because the handoff between them is usually where the time goes.
03What does AI-native actually mean here?+
That AI sits in how the work gets decided and built, not bolted on at the end as a tool your team happens to own. The loop from customer signal to shipped outcome gets short, the same people who decide what to build also build it, and the context lives somewhere the agents can actually reach.
04Who is the right fit for this work?+
Teams in DACH that are funded, staffed and shipping every week, where velocity is up but retention or activation has stopped moving. Usually the tools are already bought. The gap is in how product and engineering work together, which is structural and not a headcount problem.
05What stays after the day?+
The way of working, in your team, on the thing you were already building. You keep the decisions we made in the room and the changed loop. Some teams book a day and run with it; others keep me on for senior sparring while it beds in.
06 — How to startThree lines is enough
You get a reply in 1–2 business days.
If two sentences are enough, email me directly.
Stage — where you are right now
Symptom — what's actually breaking
Timing — when you'd want the day
Tell me what's going on. I read every reply myself.
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