Rainer specializes in Tax Law, with special emphasis on tax auditing and preparation of strategies on tax procedure, both administrative level (SUNAT and the Tax Court) and judicial. In the same way, Rainer advises national and foreign companies in matters of customs and foreign trade.

Previously, Rainer has been an assistant at Benites, Forno & Ugaz; as well as, legal advisor of the Odebrecht Group and H2Olmos.