Denis started entrepreneur career at the oil processing and transportation facilities, where he studied in practice special aspects of oil shipping and trading. Passed a long career from the inspector to the head of the company. In the next ten years he held senior positions and run oil trading company in Switzerland as a managing partner with an annual turnover over $15bln , working in close collaboration with all major players in the industry.
In 2008, Denis invested in his first IT company and turned his hobby of investing in startups into his job. Over the next three years he acted as an Angel Investor in a variety of start-up companies in Israel and Silicon Valley. In 2012 he founded Massa Innovations together with Victoria Palatnik where he plays a critical role in strategic development, capital raising, organizing and implementing mergers and acquisitions.