References Unique clients. Tailored solutions.

The best clients in the world. Projects that we love.
For us, "We love what we do" is not just a motto, but our work philosophy. Here is a curated selection of our work that expresses our enthusiasm for the digital world.

Wyniger Gruppe
wyniger logo
Creation of websites for the various businesses of the Wyniger Group in the hospitality to cleaning sector.
The Wyniger Group comprises 16 businesses.
apero archaeologischer keller 3
Solaria Serviced Apartments
Solaria logo
Solaria Serviced Apartments is a family-run business with holiday homes and apartments in the resort town of Davos.
Development of the website (front-end and back-end) using SilverStripe. Ongoing search engine optimisation (SEO). Search engine advertising (SEA) with Google Ads. Implementation of a guest folder with QR codes and breakfast orders. Development and implementation of features.
Illustration of a digital world in green style with central perspective and white background. modern. neuroflash.com
RDC Germany
rdc logo
RDC Germany has been successfully operating the blue car train Sylt, the BTE car train, and other trains since 2009.
In addition to the websites, we are developing the digital platform for passenger-oriented ticket sales and management. This particularly includes a web application for guest check-in.
rdc arz keyvisual
Northern Society for Diakonia
ngd logo
The Northern Society for Diakonia group is a decentralised diaconal service company with over 90 facilities in the Northern German region.

haj.tech has been managing 90 websites for various facilities for more than 20 years, overseeing the administration of central content. The implementation of an accessible website is a given, and ease of use is of particular importance.
ngd homepage
Kempinski Hotels and Resorts
kempinski logo
Web lead agency from 1998 to 2017 in the areas of website, booking system, SEO, and web application development
kempinski ciragan
Romantik Hotels & Restaurants
roho logo
Romantik Hotels is a group of over 200 hotels in Europe. Currently represented in eight countries across Europe, guests are welcomed in castles, high-quality country houses, vineyards, boutique hotels, and chalets or townhouses. We develop and operate the central website with extensive content and features, as well as integration with CRM and booking systems.
wellness romantik
ORION Versand GmbH
Orion logo
In-house development and maintenance of a B2B and B2C webshop application.
orion erotik
smartconext Construction
smartconext logo
smartconext is a market leader in the field of digital order acquisition in the Swiss construction and real estate sector.
The SaaS solution for purely digital business operations has been implemented by us and is continuously being expanded. The developed platform includes hundreds of thousands of construction project data sets, which are made available to customers through an elaborate matching system in a web application.
smartconext construction image
Sunstar Hotels
sunstar logo
The Sunstar hotel group is known for its traditional Swiss hospitality and offers guests unforgettable experiences in the Swiss Alps. The individual hotels are tailored to the needs of guests in their respective regions and provide activities such as hiking, skiing, wellness, and culinary delights.
We have built the group website and the individual hotel websites and continue to develop them in a long-term collaboration.
Mountain World Sunstar
EgoKiefer leading window and door manufacturer in Switzerland
egokiefer logo
Development of a web application that automatically provides EgoKiefer AG with building application and submission data simultaneously with publication. The management of building application and submission data, as well as the entire application process for building applications, takes place via a web application.
egokiefer reference
Tradition Julen - Family business with 3 hotels and 3 restaurants in Zermatt
tradition julen logo
Creation, development and operation of the web presences, SEO and the development of a web application through which the guest can access various applications such as their booking data, table reservations, event registrations and more via their access.
Tradition Julen Schwarznasenschafe v2