Hermine specializes in civil law and litigation, specifically on seizure, enforcement and state taxes collection. For the last 15 years, Hermine has primarily worked for the Dutch Ministry of Finance and Tax and Customs Administration, initially as a deputy State Advocate and, since 2004, as a full State Advocate.

Further, Hermine is a committee member of the Dutch Association for Civil Procedure Law and a regular contributor to the Dutch magazine Tijdschrift voor Civiele Rechtspleging (Civil Procedure Journal). She also co-authored an annotation on Articles 254 through 259 of the Dutch Code of Civil Procedure in the Sdu publication Commentaar Burgerlijk Procesrecht (Comments on Civil Procedural Law) Hermine has been a deputy justice of the Amsterdam Court of Appeal since 2005.