We do online marketing. And the technology behind it ourselves.

  • SEO, GEO, SEA, Analytics and Affiliate from a single source
  • Custom tools and tracking architectures, built individually
  • Clients from SMEs to corporations, across over 20 sectors
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Your certified partner
4.9
Based on 33 reviews
 Substance instead of promises 

Measurable online marketing performance in numbers

Hard facts from Google Ads, Meta, Sistrix, and Awin. Across all our channels.

In-house engineering team

Developers, own tools and smart workflows for SEO, GEO, SEA and tracking. This ensures that rankings, smart bidding and your AI visibility rely on data that is truly accurate.

60+ clients, for over 10 years

Long-standing connections from B2B industry and healthcare deep into e-commerce. We support solid medium-sized enterprises just as successfully as international corporations.

Over €11 million media budget

Managed by us in the last three years. We have overseen over 49 active SEA accounts and 15+ million clicks, with precise tracking tailored exactly to every euro.

Person am Schreibtisch betrachtet Diagramm auf Monitor in Büro.
 Search Engine Optimisation 

SEO, which translates visibility into real traffic.

We manage SEO projects from SMEs to enterprises. Technical SEO, content strategy, semantic architecture, and tracking, which makes the impact measurable. No quick tricks, but solid foundations on which rankings can be maintained permanently.

SEO
Zwei Männer diskutieren vor einem Computerbildschirm mit Diagrammen.
 AI visibility for brands that want to be found in ChatGPT, Gemini, and Claude 

GEO, when visibility no longer ends with Google.

Generative search systems are changing how people discover brands. We are systematically establishing presence in ChatGPT, Gemini, Google AI Overviews, and Claude. Strategic consulting, citable content, and an own tool for AI visibility measurement, which makes the impact visible per platform.

GEO Consulting
Drei Personen lächeln und unterhalten sich an einem Tisch in einem hellen Raum.
 Search engine advertising 

SEA, which is driven by ROAS and leads, not clicks.

Paid search is now mathematics with brand management. We orchestrate Google Ads, Microsoft Ads and Google Shopping in granular account structures that supply Smart Bidding with the right signals. The difference is made by the tracking behind it. Server-side, clean, custom-built.

Search Engine Advertising (SEA)
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 Analytics 

Tracking architecture as a prerequisite for performance.

Weak tracking turns every marketing decision into a guess. We build server-side tracking, GTM architectures, BigQuery setups and marketing dashboards. With our own developers, tailored specifically to the client. This ensures that smart bidding, reporting, and attribution are based on accurate data.

Web analysis
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 Content Marketing 

Content that is visible. And converts.

Content Marketing 2026 is more than just good texts. We develop keyword and content strategies that work for traditional SEO, for generative search, and for conversion simultaneously. Structured, well-founded, with clear source work. Texts that customers order because they are effective. Not because they meet a word count.

Content Marketing
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 Affiliate Marketing 

Affiliate programmes that publishers are keen to extend.

Affiliate marketing operates through relationships, not tools. As Awin Certified Agency, we manage programmes for brands such as Rosenthal as well as other clients in e-commerce, pharmaceuticals, and cybersecurity. With direct publisher relationships, our own banners, and an ongoing publisher newsletter.

Affiliate Marketing
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 Server-Side Tracking 

Tracking that also works when the browser blocks.

Third-party cookies are dying, ad blockers are becoming more granular, and browser manufacturers are disabling tracking mechanisms faster than any data protection authority. Server-Side Tracking shifts data collection to proprietary infrastructure. GDPR-compliant and independent of browser behaviour. We build the architectures with our own developers, tailored specifically to customer setups. Smart bidding and reporting operate on data that is accurate.

Server-Side Tracking


 What makes the difference 

Tracking, tools and minds under one roof.

Founded in 2006 by Ralph as a pure SEO agency, active in Bonn since 2012, now with 25 team members and its own engineering depth. No pitches, no buzzwords, no slides with stock photos. If you want to know how we really work, it’s best to take a look for yourself.


Agency
 Customer Testimonials 

What customers say.

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Benjamin Günther

Bergson

Thank you very much for your thoughtful proactivity: I have rarely experienced that with agency partners. Great compliment at this point!

Rotes Logo mit stilisiertem 'S' und rotem Punkt darüber, darunter der Text 'KSK-Immobilien'.
Ruben Müller

KSK-Real Estate

Rheinwunder supports us in numerous topics of search engine optimization and website tracking. We particularly appreciate the pleasant collaboration as well as the consistently professional results.

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Christian Hunder

German Medical Publishers

We have a long-standing partnership with Rheinwunder in the areas of SEO, SEA, and web analytics. The in-depth knowledge of our products allows for tailored solutions time and again. We would love to see more of that!

Weiße Buchstaben 'EKD' auf lila Hintergrund.
Grischa Roosen-Runge

Evangelical Church in Germany (EKD)

The support from Rheinwunder in analyzing keywords and creating search engine optimized content is highly professional, thorough, and characterized by a love for detail, which is why we enjoy working together.

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Mizzi Bauer

Sine-Sine

Great and friendly team with creative ideas and also top-notch expertise! Highly recommended!

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Marcus Schulze-Moos

Essence-pur GmbH

We have been working together since October 2020. Highly professional, great team with excellent results. Highly recommended. We look forward to another exciting collaboration.

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Des Porter

Concept Car Credit (UK)

As a former colleague, Ralph is currently offering us online marketing and optimizations for our company. Therefore, I have absolutely no reservations about recommending him as an expert. Ralph is not only technically skilled, but he can also empathize with the specifics of our industry and thus deliver excellent work.

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Ralf-Peter Reimann

Evangelical Church in the Rhineland

We requested Rheinwunder for an SEO analysis and the development of a content strategy. Quick feedback and elaboration and presentation. We will stay on the topic. Thank you!!!

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Dagmar Kemper

Poko Institute OHG

Thank you very much for the successful, long-term collaboration. Keep it up! Excellent both personally and professionally, along with quick response times and clear language even in more complicated matters. I always gladly recommend you.

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Inge Brendler

HereLocation

Rheinwunder helped me create my website and my opinion about it: Absolutely recommendable!!! Excellent, personal consultation where you can really learn something, along with technically flawless and very fast implementation. Super friendly team!

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Johannes Hollmann

We Are Indeed

Unrestricted recommendation: Technical competence, reliable timings, pleasant collaboration. Thank you!

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Eric S.

Cologne First Trade GmbH

We have been a customer of Rheinwunder with our company for a year now and are very satisfied! The advice and support are really great. The team is super friendly and very helpful. The professional competence is excellent! Problems are quickly understood and solutions are usually found quickly. Whether it’s on-page SEO, Adwords, or social media advertising, working with Rheinwunder makes it fun to implement the projects.

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Ben Tullett

Croud Agency (UK)

I had the pleasure of working with Ralph on SEO projects for EasyJet and British Red Cross. His expertise, analytical depth, and creative marketing ideas have impressed me. I especially appreciate his ability to explain complex topics in an understandable way. I look forward to further collaboration in the future.

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Frank Rautenberg

Haas & Haas GmbH

Rheinwunder GmbH has been managing our Google Ads and Shopping campaigns for leons-weinhaus.de for over two years – reliably, flexibly, and with a great sense for our products. Both in day-to-day operations and in strategic matters, the team regularly provides valuable insights for our market presence – always professionally and technically at the highest level.

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Martijn van Dijk

Increase B.V. (NL)

A great partner to work with. Rheinwunder has been our partner for the German market for over 5 years!

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Lena Kretschmann

Team leader at Sternsinger

Thanks to Ralph for this super competent SEO workshop! The training was very well prepared, structured, and above all tailored to the needs of our online team. We can confidently recommend the experts from Rheinwunder to all SEO enthusiasts.

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Walter Ehrensberger

SVEA Finans AG

Ralph has a very extensive knowledge of search engine optimization and internet marketing.

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Fabian Franke

NEPATA Vertrieb GmbH

As the marketing manager of an international e-commerce company, I greatly appreciated the professional collaboration with Rheinwunder. I can highly recommend the wide range of expert knowledge and the resulting work.

 Contact 

Request initial consultation.

In the initial conversation, we examine the client setup, goals, and existing infrastructure. This leads to concrete recommendations: what can be improved immediately, what is worth addressing strategically, and what should deliberately be left untouched.

Daniel Schüller Bonn
Contact person:
Daniel Schüller
0228 433 994 14
Contact
4.9
Based on 33 reviews
 From our blog 

Current topics from practice.

 Contact 

Request initial consultation

The initial conversation focuses on client setup, current performance, and specific next steps. A brief description of the project is sufficient. Ralph will get back in touch.

4.9
Based on 33 reviews
Ein Mann in weißem Hemd lehnt an einer Wand, neben ihm das Rheinwunder Logo
Founder Ralph Grundmann 0228 243 313 53