Nicolle Heitsch completed her law studies and legal clerkship in Heidelberg. During her legal training, she completed placements at the Administrative Court of Baden-Württemberg and at a commercial law firm in the Rhine-Neckar district, among others. She then went on to obtain her doctorate at the University of Mannheim. While working on her doctorate, she worked as a lawyer at an international law firm in Mannheim and as a research assistant at the Faculty of Law at the University of Heidelberg. After completing her doctorate, Nicolle Heitsch initially worked for three years as a fully qualified lawyer at a utility company in the Rhine-Neckar district before continuing her career as a lawyer at a medium-sized law firm in Stuttgart/Mannheim in 2007.

Nicolle Heitsch joined the firm in 2011 and works as a specialist lawyer for construction and architectural law, focusing on this area as well as commercial tenancy law. Another focus of her work is administrative law, particularly public building law. Nicolle Heitsch advises construction companies, property developers, builders, architects, and engineers, as well as cities, municipalities, municipal associations, and other public bodies and institutions.

Nicolle Heitsch is a member of the German Bar Association, the Heidelberg Bar Association, and the Working Group for Private Construction Law of the Heidelberg Bar Association.