Christianna graduated with First Class Honours from the London School of Economics in 1998, with a BSc in Social Psychology.
She went on to work as a Management Consultant at PriceWaterhouseCoopers in the UK. She returned to Cyprus in 2000 to join the P.M. Tseriotis group as HR, Marketing and PR director. In 2004, she became Marketing director of Unicars Ltd.
In 2007, she moved to Tseriotis Consumer Goods and assumed the role of Managing Director. In 2009-10 she successfully completed the part-time Global Executive MBA degree at INSEAD Business School. In 2012, following the break-up of Tseriotis Consumer Goods to form Unilever Tseriotis Cyprus, Tryfon Tseriotis and Diapo, she assumed the role of Managing Director of the latter. In 2017 she became CEO of Unicars Ltd.
She is a member of the board of the Motor Vehicle Importers Association and the Nicosia Nautical Club.