Your sparring partner on speeddial
Sanity checks, critical feedback, and pep-talks for startup founders—All within minutes.
Your sparring partner on speeddial
Sanity checks, critical feedback, and pep-talks for startup founders—All within minutes.
Additional brain
"Jeroen is an additional brain. Someone who shares your ambitions, has relevant experience and knowledge, and can provide support at a deeply personal level"
Julia
Founder of Badge
Now doing sales calls confidently
"I needed a structured approach to scale my sales calls and tactics for smoother conversations. With Jeroen’s input, I walked into those meetings feeling more confident than ever."
Philipp
Founder of Rollouter
Learn to think like a startup
"By working with Jeroen, I've learned how to turn big ideas into small experiments. This increased momentum and focus for our startup. We now know what works, without spending 6 months of building it."
Caroline
Founder of Grape Genius
Mindset shift to the customer
"He helped me to shift my mind away from what I offer to focus on the customer. From supply to demand. This has helped me to sharpen my value proposition immensely"
Dylan
Founder of Bildung Academy
Hard and honest feedback
"Jeroen doesn't beat around the bush. He highlighted what customer information I missed in a direct way, I immediately knew where to focus. That's the kind of feedback I prefer to hear, cold and early."
Javier
Founder of Nummary
Experience as mentor
Early-stage startups worked with
Accelerators worked at
My way of working
Mentoring Subscription - Jeroen as a Service (JAAS 👸)
Unlimited DMs
You can email me or WhatsApp me unlimited questions throughout the week
30 or 60 minutes call time per week
Quick call, short calls, sometimes you just need a sounding board. Schedule quickly, I'm flexible, only a few days ahead sometimes.
Cancel each month
14 day free refund, no small print
Our Team
Have you ever seen them in the same room together? 😏
Jeroen the Mentor
Guiding light
Jack of all trades: Trained as a designer, ex-founder, ex-product-owner, innovator at corporates and now experienced mentor.
Jeroen the Scientist
Researcher of product-market fit
My PhD focuses on how early-stage founders design their startup. Fringe insights from academia.
Jeroen the Energizer
Battler of downs
Doing a startup is a rollercoaster. I've coach founders through hard times, focusing on the upside of things.
Almost any startup type
Consumer hardware & software
Trained as a product designer, I love tailoring solutions and propositions to consumers. Marketing to consumers is different than businesses. I'll teach you how.
B2B
How to sell to businessess? How to segment a market if there are 4 stakeholders? Having advised many B2B startups, I help you to navigate that maze.
B2G (Government)
Governments are a peculiar customer type. Mandate is scattered, the organisations can seem like an impenetrable fortress. I will help you get there.
Deep Tech
Science based startups or academic founders to find their beachhead market.
Pricing for mentoring
Jeroen as a Service (JAAS 👸)
Monthly subscription
Starting from
€190
/ month (excl. VAT)
€380
/ month
30 or 60 minute calltime per week
Unlimited questions over chat
Cancel each month
14 day free refund, no questions asked
Single session
Starting from
€70
/ 30 minutes
€40
/ 15 minutes
Quick call, schedule immediately
No strings attached
All questions you wish to have answered
End-of-summer deal
Get 90% off your first call
€7
/ 30 minutes
€40
/ 15 minutes
Same is normal single session
Get 90% discount on first call below
Schedule a free first call
Leave your email to get the 90% discount code for the first 30 minutes.
