Venture firms play an important role as a new growth power in the Korean economy which steps onto a low-growing stage. One of the government policies driving the creative economy to the next level of growth focuses on the activation and growth of these venture firms. However, the growth of venture firms has suffered greatly due to weak domestic market growth. In order to overcome such an obstacle, more venture firms have tried to enter the overseas market. In particular, technology-intensive venture firms are increasingly entering the overseas market soon after start up. It is critical for these venture firms independently entering into overseas markets to have appropriate strategies for establishing relevant core competencies. The export strategies of large enterprises and the joint overseas expansion strategies of large, small, and medium companies are not applicable to venture firms because it utilizes a different approach. This paper suggests, through a case study on RSupport, global market penetration strategies for venture firms to establish competitive advantages using core competencies and resources. For venture firms trying to enter the overseas market at the start of business, it is critical to acquire both internal and external competencies including technology and resources. Furthermore, they must establish proper relationships with local partners for better value appropriation by analyzing the architecture of local markets. After having set up partnerships, it may be easier to overcome local sales and distribution obstacles. A case study on RSupport, which first entered Japan and then expanded into China, Europe, and North America successfully, suggests these strategies for attaining global competitiveness, especially in the software industry.