Our team

Our SEO advice is clear and progressive. Our services are transparent: we like to be open about the way we work. Thanks to our 100% focus and comprehensive approach, we achieve great results for our clients. Whatever your SEO question.

Our team consists of experienced SEO specialists with several years of experience who are broadly applicable in the SEO world. Our company is built on a few core values namely: specialism, onder support and personal relationship. With these, our company has already achieved several successes and we help many different types of businesses.

Bart van Heulen

Bart van Heulen

Technical SEO/ CRO Specialist

Bart van Heulen is technical SEO specialist at Onder. After several years of working on the sales side of online marketing products, the interest came more and more to explore the depth of wondere ...

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Celine van der Ploeg

Office manager

As Office Manager at Onder, Celine deals with a very versatile range of tasks, including onder other human resources, facilities management, (financial) administration, marketing, organising...

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Cynthia Bos

Technical SEO/ CRO specialist

Cynthia is Technical SEO/CRO Specialist at Onder. Her passion lies in improving websites by using the data collected. With the ultimate goal of getting the best results for...

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Ineke Withaar-Colijn

Ineke Withaar-Colijn

Content specialist & SEO trainer

Ineke Withaar-Colijn is a Content specialist and SEO trainer at Onder. She tackles SEO and SEA with enthusiasm and a critical eye to work towards the best results. Furthermore, ...

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Ivo Nijboer

Ivo Nijboer

Content specialist

As a SEO Specialist, Ivo focuses mainly on your on-page SEO and acts from strategic frameworks.By working out complete scenarios, he determines the best strategy together with you......

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Jeroen Dam

SEO specialist

Jeroen Dam is a content specialist at Onder. He gets energy from writing texts that make an impact for your website. He does this by building a bridge between the needs of your do...

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Jesse Commandeur

Jesse Commandeur

Content & Authority Specialist

Jesse is a Content & Authority specialist at Onder. He works on your link profile by providing relevant links and referrals to your website. This can have a huge impact on the drive...

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Leanne la Faille

Content & EEAT specialist

Leanne la Faille's speciality lies mainly in content, but this does not stop her from developing in other fields as well. As a result, she not only helps your website with good conten...

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Linde van Gurp

Marketing assistant

Linde van Gurp is a marketing officer at Onder. She ondermaintains our website, writes the monthly OnderBuilding, keeps the social media channels up to date and makes sure our SEO training onder the ...

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Maaike Hoedelmans

Content specialist

Maaike joins the Onder team as a content and SEO specialist. She studied marketing and communications in Tilburg. Originally from Brabant, she has been living in the ge...

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Mariska Pike

Mariska Pike

Content specialist

Mariska Snoek is a content specialist at Onder. She is mainly concerned with improving content to ensure that the best possible results are achieved. This involves moving ...

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Martijn Hoving

Martijn Hoving

Founder & SEO Specialist

Martijn Hoving is the founder of Onder. An experienced SEO specialist, he helps improve the findability of your website. Martijn also provides online marketing advice and training, in which SEO bove...

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Tristan Staal

Tristan Staal

Technical SEO & Content specialist

Tristan Staal is a SEO Specialist at Onder. He gets a lot of energy from improving companies' online results and is keen to develop further in all facets of SEO. Meanwhile, hee...

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Would you also like to be Onder part of us?

Check out our vacancies! we are always looking for extra help to make the web even better :)

Onder vacancies

These customers are supupside down from us!

Renzo van Dongen

Renzo van Dongen

Digital content manager Peugeot

Whether it's about content or technical adjustments, it doesn't matter. Martijn briefs this in a very clear way so that it can be implemented locally or by our head office in France. [...] Since the start of our collaboration, we have achieved great results. Keep it up!

Marien van Stegeren

Eigenaar Kitcentrum

When your online onder venture grows, expectations often grow too, in every area. To a large extent, we were in control of SEO and its interpretation ourselves. We found out that our own "general view" was no longer sufficient, so we engaged Bureau Onder. Surprising and clear. We have built up a fine collaboration, partly because Martijn also regularly visits our office with Eline or Mariska (depending on the case), which is very valuable to us!

Marten Stellingwerf


Martijn and Mariska make the SEO story understandable for the layman and are happy to think along with us. It is nice that there is a personal contact moment every month with an extensive report and the opportunity to talk everything through. After just a few months, Onder has already managed to achieve number 1 positions on Google with some of our webshop pages. We are very satisfied with Onder.

Mark Prummel

SEO Specialist Stella Fietsen

For several years, Onder has been a valued partner of Stella. Martijn is my sparring partner for complex SEO issues and the extra pair of critical eyes that keeps us on our toes. Together, we have achieved nice growth in online visibility, visitor numbers and leads. Onder onder stands out for its short lines of communication and professionalism. They speak our language: don't nag, get down to business. That is what we love!


Don't miss a single SEO insight
  • Insights on SEO
  • For beginners and advanced specialists
  • From experiments to developments at Google and from
    best practices to our own cases
  • A look behind the scenes at Onder

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