Nikita gained his professional experience in the field of criminal law, and in particular in criminal business law, through a long and formative period, from October 1995 to February 2004 at the law firm Vassalli & Associati (Rome) of which he eventually became a junior partner. Today, he assists and defends clients (both as a litigator and as a compliance consultant) on criminal law cases, specializing in white-collar and business crimes, and providing legal assistance as a defense counsel, drafting pleadings and legal opinions, providing legal assistance in multi-jurisdictional criminal proceedings (including comparative law, letters rogatory and international subpoenas), preliminary investigations and legal research and analysis.

Besides these matters, Nikita also advises specifically on public funding and compliance with the Legislative Decree 231/2001. He is in fact well skilled in drafting and implementing 231 Models which are devised to assist companies to limit or avoid criminal liabilities due to the crimes committed by their managers for the benefit or to the advantage of the company, as disciplined by the Decree 231/2001 and is a member of several private companies controlling bodies to verify efficacy and efficiency of the 231 Models in compliance with the Decree 231/2001.

His wide-ranging legal practice covers several different sectors: corporate, bankruptcy, banking, finance, tax, public administration, employment and food. Among his main clients are corporations and financial institutions, both domestic and international, as well as multinational companies based in Italy, looking to match their own (foreign) legislative provisions with Italian equivalent (e.g., FCPA). He has provided assistance to companies such as Abn-Amro Life, Alitalia, Auchan, Banca di Roma, Bunge, Cecchi Gori, Ciga, Corus, Enac, Ina Assitalia, Metropolitana di Roma, Rainet, Rentokil, Rete Ferroviaria Italiana, Sony Music, Telecom Italia, Viaccess, Warner Bros.

Large-scale matters that Nikita addressed include the Tango Bond refund, the Cirio bankruptcy, alleged VAT frauds involving various EU members states, alleged tax evasion in various industries (IT, beverages, etc).

In addition to his professional practice, he has been collaborating at the Department of Criminal Business Law of the School of Law, University of Siena (from 1996 until 2003), and he is a published author in specialized legal reviews of various white-collar criminal articles.