She graduated from the Faculty of Marketing of the Moscow Academy of Humanities and Social Sciences in 1996. During first years of her studying she started working in US Company Quasar Communications. In 1994 she became an employee of Mikhailov and Partners, a newly established PR agency.
In 2002–2004, worked as a Head for Corporate Communications of ESN Group. In 2004 she became a partner and a consultant of BBDO Group and organized a PR agency as part of the Group. In 2005 she came back to Mikhailov and Partners as a President of the company. She arranged over 200 communication campaigns there, three projects of hers won Silver Archer National Awards.
On February 3, 2017, by the Order of the Minister of Culture of the Russian Federation, she was appointed as the chairperson of the board of Soyuzmultfilm. Under her leadership, the studio started a new stage of development: the production of series, full-length, author's projects was launched. In 2020, thanks to the activities of Yuliana Slashcheva, Soyuzmultfilm attracted the largest strategic partner in the history of Russian animation — SBER Company, in cooperation with which a detailed development strategy was developed. According to long-term plans in the coming years, Soyuzmultfilm should become one of the prominent players in the industry on the world market.
In October 2019, she was appointed General Director of the Gorky Film Studio. According to the new development strategy approved by the board of directors in 2020, the company plans to restore the studio stages, update the technology and become a leader in Russia in the production of popular science and documentary films, feature films for youngsters and families, as well as a creative cluster for young directors, screenwriters and producers. Currently, the studio is producing several lines of art, popular science and documentary projects.
Yuliana Slashcheva is annually in the ranking of the top managers of the Kommersant publishing house in the Media Business category. In 2015 she was named one of the 20 Most Powerful Women in Global TV 2015 by The Hollywood Reporter. In 2021, she won the Grand Prix of the Media Manager of Russia Award.