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Founder-CEOs · tech, marketplaces and B2B services · €200K–6M

Cohort 2 · starts the week of 2 November

Disappear for 30 days. Does everything fall apart?

If you hesitated, your company still depends too much on you. The FounderOS audit reads your numbers, names what's blocking you first and gives you the plan to remove it. 10 minutes, free.

Take my free audit Count your signals, in 1 minute ↓

No card. Your answers stay in your account.

A founder in a blue parka climbs toward a summit blocked by four successive brick walls.
Thibaut Vanderhofstadt

Thibaut Vanderhofstadt11 years CEO of Sortlist, from zero to €10M ARR. He runs every cohort.

EponEdgeLes SuspendusLes SuspendusWoommyImpact Us TodayFounders who installed it: EponEdge, Les Suspendus, Woommy, Impact Us Today
Their results →

Sortlist, featured in

TechCrunch Tech.eu La Libre

Networks

Solvay StartLab Brussels Réseau Entreprendre Bruxelles

Recognize Point A? The audit shows where you're stuck, with your numbers.

Point A · today

You are the system. Everything runs through you.

Point B · by the end of the program

You steer the system. It runs without you.

Before the audit, count your signals

The founder-bottleneck has two faces.

Everything runs through you, or you say yes to everything. Tick what's true in your company today, not what you'd like it to be.

The founder carries a huge block alone on his back up a snowy slope.

3 signals or more: the audit is for you.

Take the audit

Fewer than 3 signals? The Mirror (15 min, no email) measures where your time goes

What the audit gives you

Your #1 bottleneck, in numbers, and the order to remove the rest.

  1. 1
    The bottleneck that comes before all the others. Written about your situation, with the gap in euros between where you are and where you want to go.
  2. 2
    The full route. Your bottlenecks in the order we tackle them, so you stop attacking everything at once.
  3. 3
    A 90-day plan. Three actions on your first bottleneck, ready to start on Monday.

All three are free. The full audit report is optional, at €249; it's deducted from the program if you join.

See mine
Audit result on a fictional company: the #1 bottleneck named, the gap to the goal in euros and three tiles of numbers.
Real product screens, on a fictional company: Atelier Brume.

They did it

They stopped being their company's bottleneck.

Three founders from cohort 1, in their own words and numbers.

Douglas & Thibault · Founder and partner · Les Suspendus
rope-access technician marketplace
“We were 100% dependent on the founder.”

Douglas & Thibault · Founder and partner · Les Suspendus

+38% annual revenue, in 3 months

€650K at the end of June, just before the program; €900K at the end of September (rolling 12 months).

The story
Before
Every sale went through Douglas. When he wasn't there, technical questions waited.
The decision
Take every simple quote out of his hands: standardize them, then hand them to the team.
What moved
75% of quotes go out without him. The team tracks three numbers every day, margins are read by job type, and a recurring offer is ready.
Guy · Founder · Woommy
connected heating (built-in tracking QR code)
“I was a bit overwhelmed […] Now I see things much more clearly.”

Guy · Founder · Woommy

3 weeks to build and automate his quoting system

Before: up to 4 hours per quote, and around twenty waiting.

The story
Before
Alone between job sites, quotes and admin.
The decision
A fast quoting tool, then a first hire.
What moved
The quote goes out at the first meeting. Guy is preparing his hires, and his installations carry a tracking QR code.
Sebastian Matoso · Founder · Impact Us Today
energy-renovation marketplace
“The big challenge, I think, was largely myself.”

Sebastian Matoso · Founder · Impact Us Today

+48% revenue over one year

Driven notably by 18% more requests and 22% more conversion.

The story
Before
He made every decision and stepped into every file.
The decision
Leave day-to-day to the team, and keep performance and goals for himself.
What moved
The team decides on its own day to day. He steers the numbers.

Quotes translated from French. Results specific to their company, with no guarantee for yours.

All results

The program

Five systems, installed in order. Your audit decides where we push.

90 days to install the system, 90 days of guided execution so it holds without you. In a cohort of 8 founders, on your company and your numbers, about 1.5 hours a week.

A founder facing the road blocked by walls.
1 · Audit

FounderOS Audit

The map of your real bottlenecks: you, the team, the model, the P&L, the KPIs.

Week 1
The founder at the bow of a boat points the way for the crew.
2 · Direction

Strategic Clarity

A one-pager no one can misread: ideal customer, 3 battles, health KPIs.

Week 2
A geyser of gold bursts from the hole the founder has just dug.
3 · Profitable growth

Revenue & Profit Engine

Your margin by offer and by customer, a sales process someone else can run, and the channel to push.

Weeks 3 to 5
The founder flies a small plane through fog, eyes on the instruments.
4 · Execution

Velocity Execution

Every number has an owner, every week its cadence. Your goals are reviewed with the other founders.

Weeks 6 to 8
Three roped climbers head up toward a flag.
5 · Team

People & Leadership Evolution

Written roles and expectations, a salary grid, hiring (your right hand included), management.

Weeks 9 to 11, then re-audit

The program in detail

The platform

Each installation leaves a tool your team keeps using.

  • The program. A weekly session with Thibaut and seven founders going through the same thing, plus the introductions you need for the next stage.
  • The platform. Strategy, numbers, owners and priorities in one place. Your team works in it, in English or in French, and everything exports to PDF.
  • The AI. The Copilot pre-fills your exercises with what your company has validated, without making up a number. It proposes, you validate.

Your books plug in: Odoo live, or an export from Exact Online, Yuki, Octopus, Winbooks, Pennylane… All integrations

Your strategy fits on one page.

A score that tells you what's missing, and the next step to improve it. You build it alone with the Copilot, or in a workshop with your team.

The Strategic Clarity screen of FounderOS on a fictional company.

All screens →

Who's talking to you

I've walked the path, and paid for every lesson.

Thibaut Vanderhofstadt. Co-founder and CEO of Sortlist for 11 years, from a university project to a European B2B marketplace, from zero to €10M ARR: up to 130 people on the team, 300+ hires, 9 offices across Europe. The mistakes too: a failed Series A, a business-model pivot that cost me control of my margin, a restructuring. FounderOS is the system I wish I had installed ten years earlier.

  1. 2014Sortlist is born in Brussels, with Nicolas, Michael and Charles.
  2. 2015€550K seed. TechCrunch
  3. 2017The Series A falls through: a convertible loan to hold on. First acquisition, The Briefers in Madrid. Tech.eu
  4. 2019Pivot to subscription, €2M Series A.
  5. 2020Acquisition of Agenturmatching in Munich. La Libre
  6. 2021€11M Series B. Tech.eu
  7. 2022–238 months of runway. From 130 to 75 people, then Break Even. La Libre
  8. 2025–26I hand over, then step out of operations. FounderOS, cohort 1. La Libre
The Sortlist team gathered on the steps of a covered market.
The Sortlist team
The Sortlist team in black t-shirts at a company party.
Sortlist offsite
Thibaut Vanderhofstadt, smiling, sitting on a sofa.
The Sortlist team, arms raised, in a field.

“A hard worker like I've rarely seen: he gives 100% to his project and knows how to surround himself with talented people. A CEO who combines genuine humanity with sharp analytical rigour and a customer obsession. He brings out the best in everyone.”

Olivier DanniauEx-CCO of Sortlist · Founder @ Sparkway

“What struck me most was how involved he was, strategically and humanly. After a conversation with Thibaut, people walked away more motivated, more aligned, with a much clearer view of where the company was going.”

Cristian IordanFounding Product Designer @ Lette.ai · 5 years at Sortlist

“What stands out is his genuine availability and his commitment to building something meaningful — not just for the business, but for the people around him. A real ability to bring out the best in his team.”

Alexandre Le ClercqSenior Business Developer · B2B SaaS

LinkedIn recommendations from former Sortlist colleagues, about Thibaut as CEO, before FounderOS.

Four Sortlist cases in detail: pricing, expansion, leadership, M&A. Read the 4 cases →

Who it's for

This program isn't for everyone.

It's for you if

  • You run a tech company, a marketplace or a B2B services firm with €200K to €6M in revenue, past product-market fit.
  • You want to steer by the numbers rather than push harder.
  • You'd rather have an operator who's walked the path than a coach who's read about it.
  • You're ready to do the homework with your team, every week.

It's not for you if

  • You're pre product-market fit or before your first €200K.
  • You're looking for someone to do it for you.
  • You want isolated tactics rather than a system.
  • You expect a guaranteed-revenue promise.

Cohort 2 · in English and in French

8 founders per group. Beyond that, I become the bottleneck.

Applications close on 31 October.

6 months · about 1.5 hours a week · session on Monday or Friday, 11:30 CET · four 1:1s on your schedule · direct support

Two guarantees: 14 days to try it, refunded if it's not for you. And if your #1 bottleneck isn't unblocked in 6 months (“Resolved” or “Less blocking” at the re-audit), I keep going for free.

Les SuspendusLes SuspendusWoommyImpact Us TodayCohort 1, since July 2026: Les Suspendus, Woommy, Impact Us Today.

You apply through the audit: before the call, we know whether the program can help you.

Start with the audit Book 20 minutes with me

The call is for going through your result together, or for talking first if you prefer.

The price isn't on the site: I give it to you during the 20-minute call, or at the end of the live session.