In 1999, Tuvana Buyukcinar Demir opened her first store named A46 at Abdi İpekci Street and started to work in this field. Immediately after, she has founded her first atelier in Nisantası in 2002.

In 2003, she has founded A46 Organization Company with Selim Demir.

Having achieved one of her biggest goals, Tuvanam passed on the brand name. Tuvana Buyukcinar Demir participated in fairs in Paris, London, New York and Milan, which are regarded as the world's fashion capitals. By participating these fairs, she has carried her brand, Tuvanam, internationally.

Today; with successful  and stable export figures, Tuvanam serves the purpose in 10 countries and 25 sales points in the world.

In 2010, Tuvana Buyukcinar Demir started to make haute couture designs for babies as Tuvanam Baby Couture.

In 2014, with her partners Emine Kütük and Alara Koçibey, they gave children's rooms a separate dimension and have founded 3Moms.

Thanks to the achievements brought by 3Moms in 2016, Tuvana Buyukcinar Demir started to decorate homes with the same partners and all together they have founded 3Homes.

Today, Tuvana Buyukcinar Demir appears in 4 different sectors with her vision and continues her design activities.