Where creativity and digital expertise meet

Sei Online Web Agency

We're a dynamic and forward-thinking web agency, specialising in crafting custom applications, designing websites, and optimising online visibility through the latest SEO strategies. We're also happy to consult your projects in all of their stages, we offer training and help with maintenance. Whether you're looking to create a unique web application, enhance your online presence, or revamp your website's design, Sei Online is your trusted partner for tailored solutions.

Services

Projects

From clients

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Johanna Sargeant, Milk and Motherhood

“Hana has been a joy to work with! She has passion and dedication for her work, constantly giving her absolute best. She maintained contact with me very regularly, was always on a quest for improvement, clearly shared my vision, and she seemed to know exactly what I needed before I was even aware that I needed it! I can recommend her services a thousand times over.”

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Ruedi Weber, Elektroflug Schweiz

“The website for our club was created in the shortest time possible. With Hana's inputs, we were able to precisely determine what the new website should contain. The collaboration was very professional and friendly. I can only recommend her further.”

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Nikoleta, Nikoleta Music

“Working with Hana was a very pleasant and productive experience. She is committed to the process, always full of ideas and concrete structured plans for their implementation. She brings a unique perspective to every project, which helps her develop her own style while at the same time carefully considering the client’s opinion and improving the overall concept. I would recommend her services to anybody who wishes to build a viable and productive business platform which stands out and encourages successful interactions with potential customers.”

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Niko, Prirodzene

“Working with Hana has been amazing. She's truly a professional, she was able to respond to all of our requests, solve every problem and fulfill all of our needs. She's extremely flexible and able to adapt and adjust to the client's ideas, she's made an enormous effort to implement every additional function we only found out we needed in the process. The price for her services was exactly as agreed upon at the beginning, no surprises. Quick replies to emails, great communication, she was able to explain how the web works even to complete amateurs. And last but not least, the design is truly the best part, absolutely beautiful, much better than we could have imagined at the beginning. I'd recommend Hana to everyone who wants an incredible service, amazing website done in a very short time and a beautiful design.”

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Hana Fifić, Sich Entwickeln

“Fast, concrete, precise and most helpful. Besides her highly professional services, I was amazed by Hana's patience, calmness and friendliness. She was very perceptive to all of my requests and wishes for the website, some of which were not completely precise and clear and she was willing to invest time to explore together with me until I was absolutely satisfied with the outcome. I highly and warmly recommend Hana for your homepage design.”

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Rainer Lesslauer

“Ms. Hana Harencarova created a perfect website for us very professionally. She responded to all of our wishes and, with her great ideas and great experience, created a website that was far beyond our expectations. Working with her was easy and very productive. We got a professional website for such a great price. We can recommend Ms. Harencarova without any doubt.”