From 2009 to 2010, Natalia worked as a journalist at the legal publication Pravo.ru, covering court cases involving public figures such as Alexei Navalny, Boris Nemtsov, Alisher Usmanov, Oleg Deripaska, Elena Baturina, and others.

From 2010 to 2014, she served as a special correspondent at RBC, covering law enforcement agencies and both domestic and international politics of Russia.

Among the legal cases Natalia worked on at RBC were the "second case" involving top managers of Yukos, Mikhail Khodorkovsky and Platon Lebedev; the "Kirovles case" of Alexei Navalny; the embezzlement case involving the Ministry of Defense against Tatiana Vasilieva; the case of Sergei Magnitsky, and many other high-profile legal proceedings.

From 2014 to 2020, after leaving journalism, Natalia worked on promoting various law firms. Specifically, at the law firm Pavlova & Partners, as the Director of Business Development, she was responsible for strategic business development, marketing planning, organizing industry events, media communications, participation in professional rankings, and more.

Since 2020, Natalia has been working as an independent consultant in strategic business development, startup promotion, and personal brand building, founding the company NK Consulting. Natalia Klein is the author of numerous publications, a guest on programs, and a speaker at events related to the promotion of professional services.