Ahtisaari's business career started at a new media company Satama Interactive in 1998. In 2005 Ahtisaari left the company to join its biggest client, Nokia in 2002. He was appointed Director of Design strategy in 2005. In 2006 he left Nokia and joined his former boss, Nokia CEO Pekka Ala-Pietilä to start an advertisement-supported mobile network Blyk. In 2007 Ahtisaari became the founding investor and CEO of online business travel startup Dopplr, which was acquired by Nokia in 2009. Between February 2009 September 2013 Ahtisaari was Head of Product Design at Nokia. In January 2012 he was appointed as a member of the Nokia leadership team. Ahtisaari announced his resignation from Nokia when Microsoft acquired Nokia's devices business in September 2013.
In addition to his business career, Ahtisaari is an occasional musician and once received a Grammy Showcase Award for new artists.
Marko contributed the essay "Intelligent Travel" to the Freesouls project.