Andrés has focused particularly on both local and international business law, corporate law, mergers and acquisitions, and foreign investment.

Among other matters, he has specialized in the legal design and implementation of business transactions, including corporate group restructurings, Joint Venture negotiations, and Shareholder Agreements, as well as leading Due Diligence processes and negotiating and implementing various company purchases and sales. He is a director and representative in Chile for several foreign companies and foundations, for which the firm provides Pro Bono services.

He has advised local and foreign companies of various industries, structures, and sizes. He has also successfully litigated in civil, commercial, and competition law. Andrés has served as an expert on Chilean legislation before the International Arbitration Court in London and Australian courts, was the editor of the book Doing Business in Chile, and contributed to World Bank publications.

Andrés regularly writes opinion columns on matters of public interest, the rule of law, innovation, and trends in the legal industry, both in major media outlets and specialized press.