The achievement and sustainable maintenance of a competitive advantage is one ofthe most important strategic objectives of companies. Especially, in the Software-as-a-Service industry where global becomes local, the internationalization of companies is indispensible in order to obtain a competitive advantage. The Intact GmbH is an Austrian based software company founded in 2001 by four friends with a shared vision to increase quality in the food safety industry. The offered software solution is a modular based Enterprise Resource Planning system with a full solution approach. Since the acquisition of its first customer outside of Europe in 2005,the Intact GmbH operates internationally.Today the company has built up a large international customer base with customers allaround the globe. Furthermore, the company focused in the recent years predominantly on a growth strategy and in 2018 sold 51% of their shares to the investment group named IMCAP GmbH. Therefore, the Intact GmbH strives to enter new markets and continue to grow its international customer base.In this respect, the master thesis aims to develop a market entry concept for Croatia and Slovenia to enter the new markets between July 2022 and May 2023. The concept serves to support the Intact GmbH in the market entry process.The main aspects of the theoretical section focus on the market entry in the Softwareas-a-Service industry for companies operating in a niche market. First, the terminology of is clarified in detail for the reader to understand the environment. Furthermore,marketing strategies for internationalization are provided with a strong focus on the digital toolset available for marketers such as lead management and Search EngineOptimization. Based on this the different modes of entry for SaaS companies are discussed and aligned with the prior theoretical input. The conclusion of the theoretical section is an overview of the market entry concept with the recommended market entrymode suitable for an Austrian software vendor entering new international markets with a strong focus on digital marketing activities.For further insights and information retrieval, secondary and primary market research is conducted in the practical section of this master thesis. Within the primary market research, fifteen experts have been interviewed with expertise in the Testing,Inspection and Certification market of Croatia, Slovenia and Austria. To gain further insights into the differences and similarities of the markets and the market view, additionally three experts from Austria have been interviewed. Lastly the conclusion, findings and results of the primary market research are combined for the development of the market entry concept for the Intact GmbH consisting the market entry mode, action plan and recommendations for digital marketing activities. The last part of this master thesis provides further recommendations of action for the Intact GmbH on the adaption of the SaaS marketing mix.