Kasandra-Rose Villeneuve's practice focuses mainly on civil and commercial litigation, covering all aspects of litigation. In particular, she provides legal advice, drafts proceedings, and represents clients before the courts.

Her practice also covers regulatory law, particularly consumer law and privacy and access to information law. She also advises clients on regulatory matters related to insurance.

Kasandra-Rose handles matters relating to the issuance of authorizations to contract by the Autorité des marchés publics (public procurement authority) for the awarding of certain public contracts. She is frequently called upon to help local and foreign companies as part of this process.