We are not course farmers.

We are closers, marketers, thinkers and doers.

 A team of 13 professionals who help companies grow every day — and help people grow into professionals.

No empty promises or American nonsense with us.
 No “you deserve a Lambo in 90 days” stories.

So what?
Hard work.
Sell ​​smart.
And everything we do is substantiated with results.

What we do

Optimal Groeien is a full-service growth agency — with a specialization in high-ticket sales.

This means: we help companies attract their most valuable customers.And we help people learn the skills to do that.
We combine:

Branding → so that your proposition is correct
Marketing → so you get the right leads
Sales → so that deals are made
AI & Automation → so you can make everything scalable
And all that under one roof. One team. One strategy.

Our Team

Meet the team behind your growth

- No freelancers. No call centers.

- Just a team of 13 professionals who work on growth every day.

- Each with their own expertise. But all with the same goal:

 Result for our customers and trainees.

Stefan Kelderman

– Founder / Strategic Brain

- 20+ years of experience in sales, 15+ years in marketing.

- Worked from the kitchen from small startups to multi-million dollar companies.

- Visionary, closer, mentor and sparring partner for companies and professionals.

- He believes in courage, structure and honesty.

“I don't do tricks. I do growth. Real growth.” – Stefan

200
+
Companies helped
150
m
Revenue generated
700
+
Successful projects

What we believe in

1. Sales is a profession.

Closing is not hard selling.

It is listening, reflecting, deepening, guiding you to the right decision.

We train and deliver closers who understand that — and feel it.

2. Results come before ego.

We are not influencers. We are professionals.

Our customers don't pay us for views, but for sales.

Our trainees do not follow any courses. They build a career.

3. Real growth is sustainable.

A deal is nice. A structural system is better.

That is why we always look broader than just “the call”.

We optimize your entire sales flow — and help build something that lasts.

200
+
Companies helped
150
m
Revenue generated
700
+
Successful projects

Why work with us?

200
+
Companies helped
150
m
Revenue generated
700
+
Successful projects

What others offer

A loose closer
An online course
Sales only
A one-man or freelancer
Results on paper
Nice talk

What we offer

A certified closer with support
A practice-oriented Academy with coaching and assignments
Branding, marketing, sales and AI
A team of 13 specialists
Results in your CRM
Clear agreements and honest promises
Our Mission

We’re on a mission to empower companies

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We’re On A Mission To Empower Companies - Corporation X Webflow Template

Ons team

We are 13 people. And no, they're not all closers. We have:
01

Marketers

02

The automation specialist

03

Brand strategists

04

Contentmakers

05

Salescoaches

06

AI specialists

07

And: closers who close deals for clients in multiple sectors every day

Team Members

The amazing team behind our company

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John Carter

John Carter

CEO & Managing Partn

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Are you our ideal candidate?

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Sophie Moore

Sophie Moore

Creative Director

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Are you our ideal candidate?

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Matt Cannon

Matt Cannon

Head of Marketing

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Are you our ideal candidate?

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What you can expect from us

Branding → so that your proposition is correct
Marketing → so you get the right leads
Sales → so that deals are made
AI & Automation → so you can make everything scalable

Whether you're looking for your first closer, double your sales, or become a top salesperson yourself — we've got you covered.

Our Timeline - Corporation X Webflow Template
2023.

25 team members

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2020.

5 team members

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2018.

First hire

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2015.

Foundation

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Our goal?

Helping companies to really grow.

And helping people to really sell.

No bullshit. No ego show. No shortcuts.

Simply: skills. Structure. Success.

Customers & students about us

– Ilse
businesscoach
“Finally someone who sells the way I would do it myself — but better.”
– Jordi
OG Academy alumni
“I started with no experience. Now I'm making more money than ever — as a closer.”
– Sara
Freelancer geworden via OG
“Not theory, but practice. And it worked. I had my first deal within 1 month.”
Our offices

Visit our offices around the globe

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San Francisco, SA - Corporation X Webflow Template

San Francisco, SA

58 Middle San Francisco, California (CA), 94124

New York, SA - Corporation X Webflow Template

New York, SA

761 NW. Hanover St. Bronx, New York 10453

Lodon, UK - Corporation X Webflow Template

Lodon, UK

38 Alexander Road London, E13 9UL

Ready to work with us?

 Or curious how we can help you?

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